Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access  
Advanced Device Materials     Open Access   (Followers: 3)
American Journal of Fluid Dynamics     Open Access   (Followers: 48)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 5)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 20)
Complex Metals     Open Access   (Followers: 2)
Corrosion Communications     Open Access  
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 10)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 3)
International Journal of Metals     Open Access   (Followers: 6)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 8)
International Journal of Mining and Geo-Engineering     Open Access  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 23)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 32)
Journal of Advanced Joining Processes     Open Access   (Followers: 1)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 7)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 1)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 19)
Journal of Metallurgical Engineering     Open Access   (Followers: 2)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Engineering     Open Access  
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 30)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research & Technology     Full-text available via subscription  
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 6)
Metallurgy and Foundry Engineering     Open Access   (Followers: 1)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 33)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 7)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Rare Metals     Hybrid Journal   (Followers: 2)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 4)
Soldering & Surface Mount Technology     Hybrid Journal   (Followers: 1)
Stainless Steel World     Full-text available via subscription   (Followers: 17)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 4)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 1)
Welding in the World     Hybrid Journal   (Followers: 4)
Welding International     Hybrid Journal   (Followers: 7)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Welding in the World
Journal Prestige (SJR): 0.533
Citation Impact (citeScore): 2
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0043-2288 - ISSN (Online) 1878-6669
Published by Springer-Verlag Homepage  [2469 journals]
  • CMT Twin welding-brazing of aluminum to titanium

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      Abstract: A cold metal transfer (CMT) Twin welding-brazing technique was applied to Ti/Al dissimilar metals for the first time. Significant improvements in intermetallic compound (IMC) suppression and joint strength were obtained. Compared with the normal CMT, the reasonable range of the welding heat input was extended by 15.4%, the IMC thickness was further suppressed to 0.53 μm, the maximum tensile strength of the joint was up to 297 MPa, and the fracture position was transferred from the IMC layer to the base aluminum, by employing the CMT Twin. The serrated IMC was identified to be Ti (Al, Si)3 by TEM and evenly distributed at the interface layer. Whether for the common single-wire CMT or CMT Twin, with decreasing heat input, the IMC thickness decreased, and the joint strength increased. The CMT Twin shows significant advantages over the traditional single-wire CMT in terms of a higher welding speed, lower heat input, thinner IMC thickness, and higher joint strength on the joining of incompatible dissimilar alloys.
      PubDate: 2022-06-01
       
  • Mechanical and microstructural properties of S1100 UHSS welds obtained by
           EBW and MAG welding

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      Abstract: The microstructures and mechanical properties of welds consisting of 20-mm-thick thermo-mechanically rolled and directly quenched S1100MC ultra high-strength steel (UHSS) plates were investigated. The welds were produced by means of metal active gas (MAG) welding and electron beam welding (EBW). Different heat inputs of the welding processes influenced the microstructure and thus the mechanical properties including impact toughness, hardness, and tensile properties. The microstructure of the MAG weld obtained when using undermatched solid filler wire consisted mainly of acicular ferrite (AF), and it appeared more polygonal when the heat input exceeded 2 kJ/mm with spray arc in the filler pass. The coarse-grained heat-affected zone (CGHAZ) showed different microstructures depending on the thermal cycles of the respective welding processes. Fresh martensite formed in the CGHAZ of the last welding pass at both the bottom and the top surfaces, as there was no reheating from any subsequent pass. The microstructure obtained with EBW without any filler material consisted of martensite and tempered martensite in the fusion zone. Martensite with small prior austenite grain (PAG) size significantly increased the hardness of the fine-grained heat-affected zone (FGHAZ) compared to the CGHAZ and fusion zone. Uniaxial tensile testing of EBW specimens indicated higher tensile strength of the weld than of the base metal, as the specimens fractured at the base metal. In contrast, fracture of MAG specimens occurred at the weld. Hence, the tensile strength of the MAG weld consisting of undermatched filler metal was obviously lower than the tensile strength of the base metal. However, the ferritic MAG weld possessed higher impact toughness than the martensitic EBW weld.
      PubDate: 2022-06-01
       
  • Effect of the Heat Input on Wire-Arc Additive Manufacturing of Invar 36
           Alloy: Microstructure and Mechanical Properties

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      Abstract: Invar, also known as FeNi36, is a material of great interest due to its unique properties, which makes it an excellent alternative for sectors such as tooling in aeronautics and aerospace. Its manufacture by means of wire arc additive manufacturing (WAAM) technology could extend its use. This paper aims to evaluate the comparison of two of the most widespread WAAM technologies: plasma arc welding (PAW) and gas metal arc welding (GMAW). This comparison is based on the analysis of wall geometry, metallography, and mechanical properties of the material produced by both technologies. The results show a slight increase in toughness and elongation before fracture and worse tensile strength data in the case of PAW, with average values of 485 MPa for ultimate tensile strength (UTS), 31% for elongation and 475 MPa, 40% in GMAW and PAW, respectively. All results gathered from the analysis show the possibility of successful manufacturing of Invar by means of WAAM technologies. The novelties presented in this paper allow us to establish relationships between the thermal input of the process itself and the mechanical and metallographic properties of the material produced.
      PubDate: 2022-06-01
       
  • Comparison of process behavior, microstructure and mechanical properties
           of ultrasound enhanced friction stir welded titanium/titanium joints

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      Abstract: Titanium as a high-performance material offers great potential for a wide range of applications with different aspects like lightweight-constructions, biocompatibility as well as design and is used in various industrial areas like the transportation sector or in medical and sports engineering. To exploit the full potential of titanium, there is still a need for innovative and efficient joining techniques compared to conventional methods. The process of friction stir welding as a solid-state joining method is able to produce high-quality similar joints of titanium. Nevertheless, there are still some challenging aspects when friction stir welding titanium like the formation of oxide layers that affect the mechanical properties especially in the field of fatigue negatively. The superposition of power ultrasound on the friction stir welding process can address this issue. Therefore, the hybrid process of ultrasound enhanced friction stir welding was applied on similar Ti6Al4V/Ti6Al4V joints in a butt joint configuration to reduce the amount of oxide layers and improve the fatigue lifetime of the joints. For the joint configuration, a positive impact of the power ultrasound could be identified by the breakup of oxide layers and an increase in the tensile strength of 16%. Also stepwise load increase tests revealed a higher estimated fatigue strength for ultrasound enhanced friction stir welded specimen in this butt joint configuration.
      PubDate: 2022-06-01
       
  • Investigation of friction diffusion bonding of Al/Cu lap joint

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      Abstract: This paper reports on a new method based on the friction stir spot welding process to join Al/Cu in lap joint configuration. The feasibility of the friction diffusion bonding (FDB) of Al/Cu was investigated by varying the welding time between 20 and 50 s with all other parameters constant. A circular Cu plate was placed on the surface of an Al plate in the FDB process. The experimental results revealed that the intermetallic compounds, CuAl2 and Cu9Al4, were formed in the copper plates failed from the mechanical tests and the copper and aluminum diffused about 4μm and 2μm away from the interface into the Al and the Cu sides, respectively. Bonding was accompanied by interfacial diffusion with no significant mechanical mixing. The maximum tensile shear strength of Al/Cu joint was achieved at the welding time of 40 s and rotating speed of 1400 rpm.
      PubDate: 2022-06-01
       
  • Influence of current waveform on C-GMAW of 6061 aluminum alloy with
           addition of ER4043 wire

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      Abstract: Process stability and weld formation for cold metal transfer gas metal arc welding (hereafter referred to as C-GMAW) of 6061 aluminum alloy with ER4043 filler wire were investigated under different welding current waveforms via collecting the metal transfer images and current waveforms simultaneously. Low boost current (80 A) causes the occurrence of spatter due to the high viscosity of molten metal associated with low heat input. Increasing boost current improves the stability of the C-GMAW process and may change the metal transfer from cold metal transfer (CMT) mode to a hybrid one consisting of CMT and projected transfer. The projected transfer occurs regularly (once and three times a CMT cycle at 200-A and 240-A boost current, respectively), and it has a minimal effect on the stability of the C-GMAW process. Too high boost current duration (10 ms) leads to irregular projected transfer and abnormal short-circuit in wait current phase, and too high wait current (100 A and above) causes abnormal reigniting in the short-circuit phase, deteriorating the stability of the C-GMAW process. The wait current affects the mean CMT frequency noticeably, but both boost current level and duration have a minimal impact. The boost current, boost current duration, and wait current can affect actual wire feed speed, among which the boost current effect is the greatest. The increase in boost current or boost current also leads to a rise in the weld width, penetration, and contact angle of the weld metal.
      PubDate: 2022-06-01
       
  • X-ray weld defect detection based on AF-RCNN

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      Abstract: For X-ray weld defect detection, this paper proposes AF-RCNN object detection framework with the application of attention mechanism because defect images have too many small defects, and feature information of small defects are more likely to be missing during the convolution. First of all, the original weld images were cut and classified, and the images were labeled in the format of PASCAL VOC dataset to build a new weld dataset for object detection. Secondly, residual network (ResNet) was combined with feature pyramid network (FPN) as the backbone, and efficient convolutional attention module (ECAM) was applied to adaptively detail the interested target feature. Finally, CIoU loss function was introduced to increase the accuracy of anchor positioning in the regression of bounding box. The experiment results show that, comparing with traditional Faster-RCNN and SSD, AF-RCNN significantly improves in weld defects detection and classification.
      PubDate: 2022-06-01
       
  • Influence of rotational speed on the electrical and mechanical properties
           of the friction stir spot welded aluminium alloy sheets

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      Abstract: An efficient and productive joining technique to weld aluminium has become a priority challenge for promoting the use of aluminium in the electrical industry. One of the challenges is to obtain welds with superior mechanical properties with the consistent quality of weld surface as well as low electrical resistance. In this paper, the influence of rotational speed during the friction stir spot welding of AA 5754-H111 was studied to analyse the mechanical and electrical properties of the welds. The results from two rotational speeds (1000 rpm and 4500 rpm) are presented and compared to the base material. It was observed that the samples welded at 1000 rpm showed a higher average shear failure load (~ 1.1 kN) compared to the samples welded at 4500 rpm (~ 0.94 kN). The microhardness of the samples welded at 1000 rpm was higher than that of the base material, while the microhardness of samples welded at 4500 rpm was lower. It was also found that the friction welded sheets, regardless of the rotational speed used, showed increased electrical resistance compared to the base material, albeit this increase for the samples welded at 1000 rpm was about 42%, compared to samples welded at 4500 rpm where this increase was just 14%.
      PubDate: 2022-06-01
       
  • Finite element simulation of multi-layer repair welding and experimental
           investigation of the residual stress fields in steel welded components

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      Abstract: In this work, the effect of multi-pass repair welding for removing a fatigue crack on the residual stress fields of GMA-welded S355J2 + N and S960QL structural steel T-joints was investigated. Two scenarios were considered, a fatigue crack smaller than half of the plate thickness, and a fatigue crack larger than half of the plate thickness. Samples were first welded in a T-joint structure; then, cracks were created on their weld toes by cyclic loading; after that, the cracks were machined at one or two sides of the plate, depending on the crack length, and finally, the sample was repaired by two-pass welding on each machined area. Longitudinal and transverse residual stresses were measured by the X-ray diffraction method. A 2D thermo-metallurgical-mechanical finite element model was developed for each sample to estimate the residual stress fields through the weldments. The results show that, regardless of the alloy or repairing in one or two sides, the repair welding increases the magnitude of the residual stresses compared to the initial weld, but the alloys show different behaviors during the process. In S960QL samples, during repair welding of one weld toe, the residual stress evolutions in previously welded areas that are not subjected to the repair welding occur due to the morphological changes in the phases and expansions and contractions, while for S355J2N samples, the expansions and contractions are mainly responsible for these changes.
      PubDate: 2022-06-01
       
  • Investigation of carbide precipitations on microstructure and hardness of
           medium carbon Cr-Ni austenite stainless hardfacing deposit with high wear
           resistance properties

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      Abstract: Generally, the Cr-Ni austenite stainless steels have high corrosion resistance and good weldability, but are not used as wear-resistant material due to their low hardness. The studies were carried out to enhance the wear resistance of deposited hardfacing metals of the stainless steel by shielded metal arc welding, maintaining its superior properties at high levels. The hardfacing metals of the medium carbon Cr-Ni austenite stainless steel were deposited, using electrodes coated with flux including C and strong carbide-forming elements (Cr, Mo, V) on 18Cr-8Ni stainless steel wire. In an as-welding state, the matrix phases and precipitation of carbides in hardfacing metals were investigated, using X-ray diffraction, scanning electron microscopy, and energy-dispersive spectrometry. The surface hardness (HB) and microhardness (HV) of the metals were measured. It was found that carbides formed by Cr, Mo, and V were precipitated a lot in the austenite matrix and at the grain boundaries; thus, the surface hardness of deposited hardfacing metals was about HB 300–500, enough for high wear resistance while maintaining austenite (γ) phase as the matrix, and the effectiveness investigated by simple corrosion wear experiments.
      PubDate: 2022-06-01
       
  • Investigation of ẟ-ferrite content in weld metal of modified 9Cr–1Mo
           electrodes using thermodynamic modelling and quenching experiments

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      Abstract: During fabrication of modified 9Cr–1Mo steels, δ-ferrite formed in the weld metal and heat-affected zone may not transform completely to austenite during subsequent cooling. The influence of changes in weld metal composition on δ-ferrite content was investigated using weld pads produced using basic coated P91 electrodes from four different manufacturers. The weld pads were designated Electrodes 1, 2, 3, and 4 according to the different manufacturers. Electrodes 1 and 3 fully complied with the EN ISO 3580-A CrMo91 specification. Electrode 2 had very low nickel and high niobium contents, and Electrode 4 had carbon content above the maximum allowable limit. Thermo-Calc results showed that the temperature range over which a mixture of δ-ferrite and austenite is stable (the Ae4 − Ae3 temperature range) was smaller by more than 100 °C for Electrode 2 when compared with those of the other three electrodes. The limited (Ae4 − Ae3) temperature range, high ferrite factor, and chromium − nickel balance value of Electrode 2 were associated with an increase in the δ-ferrite content of the weld metal. Metallography results confirmed a significant amount of δ-ferrite in the as-welded microstructure of Electrode 2. Thermo-Calc estimates for the amount of δ-ferrite at high temperatures were supplemented by experimental anneal heat treatment on the weld metal. High-temperature anneal heat treatments were carried out at 1320 °C and 1420 °C. The amount of δ-ferrite in the high-temperature annealed and quenched samples was significantly lesser than predicted by Thermo-Calc property diagrams.
      PubDate: 2022-06-01
       
  • Microstructure and Impact Toughness of the Coarse-Grain HAZ Physically
           Simulated with Different Heat Inputs in a 690 MPa Ultra-low Carbon
           High-Strength Microalloyed Steel

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      Abstract: An ultra-low carbon steel plate with the yield strength of 690 MPa was produced in the laboratory. The coarse-grain heat-affected zone (CGHAZ) was simulated on a thermal simulator based on the welding heat inputs of 25 kJ/cm and 100 kJ/cm, under which the microstructure and impact toughness were characterized compared with the base metal (BM). The results showed that the investigated steel exhibited a favorable low-temperature impact toughness at the heat input of 25 kJ/cm. Although high heat input was not conducive to the impact toughness, the average impact energy can still reach ⁓40 J at − 20℃ at the heat input of 100 kJ/cm. The welding thermal cycle led to the formation of more low-angle boundaries in the prior austenite grains, which was not conducive to the crack arrest behavior, resulting in a significant decrease of toughness in CGHAZ. Obvious decrease of high-angle boundaries in CGHAZ was mainly responsible for the deterioration of total impact absorbed energy. Besides, the martensite-austenite (M-A) constituents provided favorable conditions for crack initiation. In general, the mechanism of impact toughness deterioration of CGHAZ under high heat input condition was discussed in detail. The microstructure and low-temperature impact toughness of CGHAZ under different heat inputs can provide a theoretical basis for the research in 690 MPa ultra-low carbon high-strength microalloyed steels.
      PubDate: 2022-06-01
       
  • Comparison between PSM and IBESS approaches for the fatigue life
           estimation of weldments

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      Abstract: In the framework of the fatigue assessment of welded components, several methods are available in design standards such as the nominal stress, hot-spot stress, notch stress and linear elastic fracture mechanics approaches. The present paper aims at comparing two advanced local approaches for the fatigue strength assessment of different welded joints made of steel. The first one is IBESS which is based on short crack fracture mechanics. The second one is the PSM which instead involves the strain energy density approach. Both methods will be briefly presented, and the fatigue life prediction results discussed. The results obtained for the joint geometries considered in this work show advantages and drawbacks of the approaches, which are thoroughly analysed as well.
      PubDate: 2022-06-01
       
  • Provisions for avoiding brittle fracture in steels used in Australasia
           including effects of seismic action

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      Abstract: Steel structures can suffer from three modes of possible damage, which are brittle fracture, fatigue and corrosion. Corrosion can be mitigated by the applications of protective coatings, fatigue damage can be controlled by in-service inspection, and in contrast, a brittle fracture is a sudden event that only can be avoided by proper design, material selection. Inspection, probability of detection of cracks and material toughness must be considered simultaneously to avoid brittle fracture. To ensure the structural integrity of components, systems and procedures such as SINTAP and Eurocode have been developed, and the following. These procedures were applied to the steel manufactured to the European standards only. The application of the method was transferred to steels referenced in Australian and New Zealand design standards AS4100, NZS3404.1 and AS/NZS5100.6, and specifications. Several steel standards of importance in Australasia have been also considered, such as the new EN 10025, EN 10210, EN 10219, JIS G 3106, JIS 3114, API 5L and ASTM 709. The steel selection procedure has been extended by seismic considerations based on the IIW Recommendations for Assessment of Risk of Fracture.
      PubDate: 2022-06-01
       
  • High-temperature oxidation behavior of plasma-sprayed NiCrAlY/TiO2 and
           NiCrAlY/Cr2O3/YSZ coatings on titanium alloy

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      Abstract: The 70% NiCrAlY + 30% TiO2 and 70% NiCrAlY + 25% Cr2O3 + 5% YSZ metallic coatings are sprayed on titanium-15 alloy of ASTM B338, Grade 2, by using the plasma spray coating technology. Cyclic oxidation studies are conducted on the uncoated and coated alloys at 700 °C under static air environment. The kinetics of oxidation is studied by using the thermo-gravimetric method. Phase, microstructural, and chemical analysis tests are performed on as-sprayed and oxidized coatings. The coated alloys are found to be more resistant when compared to the uncoated alloys. The NiCrAlY + Cr2O3 + YSZ coating is found to be more protective when compared to NiCrAlY + TiO2 coating. It is concluded that the formation of Cr2O3, NiCr2O4, and Al2O3 is attributed to the development of oxidation resistance in the coatings.
      PubDate: 2022-06-01
       
  • A comparative analysis on friction stir welding of similar and dissimilar
           polymers: acrylonitrile butadiene styrene and polycarbonate plates

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      Abstract: In this article, the micro-structural evolution and mechanical performance of similar and dissimilar friction stir welded (FSWed) joints of acrylonitrile butadiene styrene (ABS) and polycarbonate (PC) plates were studied. All the joints (similar ABS-ABS, PC-PC, and dissimilar ABS-PC) were designed under the same process parameters of tool rotational speed (800, 1200, and 1600 rpm), tool traverse speed (0.1, 0.2, and 0.3 mm/s), and tool tilt angle (0°, 1°, and 2°) following an L27 orthogonal array. A joint efficiency of 91.70%, 61.04%, and 64.47% was obtained for similar joints (ABS-ABS, PC-PC) and dissimilar joints (ABS-PC), respectively. The ultimate tensile strength (UTS) and joint efficiency of ABS-PC joints lie in-between the efficiency of ABS-ABS and PC-PC joints for most of the operating parameters which indicate successful joining in contrast to the application of similar welded joints. The UTS, fracture locations, microstructures, and Shore D hardness have been analyzed extensively to evaluate the effects of processing parameters.
      PubDate: 2022-06-01
       
  • Diagnostics of power boiler superheater tubes made of austenitic steel
           using the metal magnetic memory technique

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      Abstract: Superheater tubes made of non-magnetic austenite steel are widely used in modern power boilers. During boilers operating process, as a result of working loads, magnetic phase (α-phase), indicating the metal damage development, is formed on defects of metallurgical origin and in local stress concentration zones. In this regard, the metal magnetic memory (MMM) technique, based on measurement of self-magnetic stray fields, gives unique opportunities to detect developing damage at an early stage of its occurrence and determine the representative sampling points to study the structural state of the metal. Examples from the practice of the MMM technique application for early diagnostics of developing austenitic tubes damages are considering in the article.
      PubDate: 2022-05-16
       
  • Ranking the susceptibility to hydrogen-assisted cracking in dissimilar
           metal welds

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      Abstract: Dissimilar metal welds (DMWs) are routinely used in the oil and gas industries for structural joining of high-strength steels to eliminate the need for post-weld heat treatment (PWHT) in field welding. Hydrogen-assisted cracking (HAC) can occur in DMWs during subsea service under cathodic protection. DMWs of two material combinations, 8630 steel/FM 625 and F22 steel/FM 625, produced with two welding procedures, non-temper bead (BS1) and temper bead (BS3), in the as-welded and PWHT conditions were investigated in this study. These DMWs were subjected to metallurgical characterization and testing with the delayed hydrogen cracking test (DHCT) to identify the effects of base metal composition, welding and PWHT procedures on their HAC susceptibility. The HAC susceptibility was ranked using the time to failure in the DHCT at loads equivalent to 90% of the base metal yield strength (YS) and the apparent stress threshold for HAC. A criterion for resistance to HAC in the testing conditions of DHCT was also established. The results of this study showed that 8630/FM 625 DMWs were more susceptible to HAC than the F22/FM 625 DMWs. PWHT did not sufficiently reduce the HAC susceptibility of the 8630/FM 625 and F22/FM 625 BS1 welds. DMWs produced using BS3 performed better than BS1 DMWs. The post-weld heat-treated F22/FM 625 BS3 DMW passed the HAC resistance criterion.
      PubDate: 2022-05-13
       
  • Influence of laser power on the microstructure and properties of Fe314
           alloy cladding layer on EA4T steel

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      Abstract: In this paper, Fe314 alloy cladding layer was made on EA4T steel substrate by using different laser powers. The microstructure, composition, microhardness, and corrosion resistance of the coating were analyzed. The results showed that the cladding layer composed of planar, columnar, dendrites, and equiaxed grains. The grain morphology changed, and the cross-sectional size of the cladding layer increased with the increase of laser power; the content of alloying elements such as Cr and Ni in the surface layer and the content of austenite phase in the cladding layer decreased with the increase of laser power. The overall hardness of the cladding layer was higher than that of the substrate. The hardness of the surface layer was the highest at 1.5 kW, reaching 609 HV0.2, the hardness of the surface layer decreased with the increase of laser power, and decreased to 493 HV0.2 at 2.4 kW. With the increase of laser power, the corrosion resistance of the cladding layer is a non-linear trend and the best corrosion resistance is achieved with a laser power of 1.8 kW.
      PubDate: 2022-05-11
       
  • Joining of Al2O3 to Cu with Cu-Sn-Ti active brazing filler alloy

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      Abstract: In this study, Cu-Sn-Ti active brazing alloys were prepared by vacuum induction melting. The microstructure and melting properties of as-cast Cu-Sn-Ti alloys were analyzed using scanning electron microscopy and differential scanning calorimetry. The optimal 87Cu-8Sn-5Ti paste was used for Al2O3/Cu brazing, and the sound joints were obtained in vacuum at 930 °C for 10 min. The joint microstructures were studied by means of SEM and EDS. The results show that there exist three zones in the brazing seam and the bonding area of the joint mainly consists of TiO, Cu3Ti3O and Cu-Ti compounds. The maximum value of the tensile strength of brazed joints reached 154 MPa.
      PubDate: 2022-05-06
       
 
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