Subjects -> METALLURGY (Total: 59 journals)
 Showing 1 - 10 of 10 Journals sorted alphabetically Acta Metallurgica Slovaca       (Followers: 2) Advanced Device Materials       (Followers: 6) American Journal of Fluid Dynamics       (Followers: 44) Archives of Metallurgy and Materials       (Followers: 9) Asian Journal of Materials Science       (Followers: 4) Canadian Metallurgical Quarterly       (Followers: 21) Complex Metals       (Followers: 2) Energy Materials : Materials Science and Engineering for Energy Systems       (Followers: 24) Graphene and 2D Materials       (Followers: 6) Handbook of Ferromagnetic Materials       (Followers: 1) Handbook of Magnetic Materials       (Followers: 2) High Temperature Materials and Processes       (Followers: 6) Indian Journal of Engineering and Materials Sciences (IJEMS)       (Followers: 11) International Journal of Metallurgy and Alloys       (Followers: 2) International Journal of Metals       (Followers: 7) International Journal of Minerals, Metallurgy, and Materials       (Followers: 12) International Journal of Mining and Geo-Engineering       (Followers: 4) Ironmaking & Steelmaking       (Followers: 5) ISIJ International - Iron and Steel Institute of Japan       (Followers: 26) Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)       (Followers: 2) JOM Journal of the Minerals, Metals and Materials Society       (Followers: 35) Journal of Advanced Joining Processes Journal of Central South University       (Followers: 1) Journal of Cluster Science Journal of Heavy Metal Toxicity and Diseases Journal of Iron and Steel Research International       (Followers: 11) Journal of Materials & Metallurgical Engineering       (Followers: 2) Journal of Materials Processing Technology       (Followers: 21) Journal of Metallurgical Engineering       (Followers: 4) Journal of Sustainable Metallurgy       (Followers: 3) Materials Science and Metallurgy Engineering       (Followers: 7) Metal Finishing       (Followers: 20) Metallurgical and Materials Engineering       (Followers: 7) Metallurgical and Materials Transactions A       (Followers: 42) Metallurgical and Materials Transactions B       (Followers: 32) Metallurgical and Materials Transactions E       (Followers: 2) Metallurgical Research & Technology Metallurgical Research and Technology       (Followers: 8) Metallurgy and Foundry Engineering       (Followers: 3) Mining, Metallurgy & Exploration Powder Diffraction       (Followers: 1) Powder Metallurgy       (Followers: 35) Powder Metallurgy and Metal Ceramics       (Followers: 7) Powder Metallurgy Progress       (Followers: 5) Practical Metallography       (Followers: 6) Rare Metals       (Followers: 3) Revista de Metalurgia Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica Revista Remetallica       (Followers: 1) Russian Metallurgy (Metally)       (Followers: 4) Science and Technology of Welding and Joining       (Followers: 8) Soldering & Surface Mount Technology       (Followers: 2) Steel Times lnternational       (Followers: 19) Transactions of the IMF       (Followers: 14) Transactions of the Indian Institute of Metals       (Followers: 5) Tungsten Universal Journal of Materials Science       (Followers: 3) Welding in the World       (Followers: 8) Welding International       (Followers: 11) Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки
Similar Journals
 Transactions of the Indian Institute of MetalsJournal Prestige (SJR): 0.361 Citation Impact (citeScore): 1Number of Followers: 5      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0972-2815 - ISSN (Online) 0975-1645 Published by Springer-Verlag  [2655 journals]
• Nano- and Micro-Scale Characterization of Anodic Oxide Layer Coating on
2017A-T4 Aluminum Alloy
• Abstract: In this paper, a multiscale characterization, down to nano, of the oxide layer coating obtained by sulfuric anodizing of 2017A-T4 aluminum alloy is proposed, under different processing conditions related to reaction/anodization time (RT) and applied electrical current (J). The multiscale characterization is carried out using scanning electron microscopy, energy-dispersive X-rays, and ImageJ post-processing software. It reveals that the oxide layer coating is a porous medium wherein the larger amount of porosity is micrometric, and that increasing RT and/or J leads to shallower and larger porosity and consequently thicker porous coating and oxide layer. Moreover, the percentage of the coating surface area covered by micrometer-scaled cavities decreases as the applied current increases. It also comes out from the multiscale analysis that the growth of the coating layer follows three main stages: the first stage is the germination of flaky and friable metastable nanoparticle oxides made of O, Al, and Si; the second stage is the growth of the oxide nanoparticles to become spherical microparticles; the third stage is the coalescence of the spherical particles to form clusters and then continuous stable layer that is rich of Si element.
PubDate: 2021-03-14

• Effects of Primary Stored Energy on Relaxation Behavior of High Entropy
• Abstract: This paper aims to show the effects of primary stored energy in high entropy bulk metallic glasses (HE-BMGs) on their relaxation behavior after elastostatic loading process. For this purpose, three HE-BMGs with different chemical compositions and primary stored energy were fabricated. Differential scanning calorimetry and nanoindentation tests were carried out to evaluate the relaxation enthalpy and microscopic mechanical characterization of alloys. The results showed that increase in the number of element types in the alloying composition leads to the increment of stored energy and structural heterogeneity in the primary alloys. Moreover, the elastostatic loading rejuvenates the primary alloys; however, an optimum heterogeneity is needed for the maximum structural heterogeneity and stored energy in the glassy alloy. The hardness measurements also indicate that the elastostatic loading intensifies the hardness variations in the alloys, which may be due to the increased structural heterogeneity.
PubDate: 2021-03-14

• A Journey Towards Improving Tuyere Life
• Abstract: Tuyere is one of the critical components of blast furnace. The function of tuyere is to supply hot air and fuels like pulverized coal inside the furnace. In doing so, tuyeres get exposed to severe thermal conditions, hot metal contact and abrasive environment. Tuyere failure contributes to major part of mechanical breakdown in the furnace leading to immense production loss. This work focuses on a continuous journey to improve the life of tuyere. The prime effort goes into understanding the zone of tuyere failure and subsequently modifying the design in terms of cooling enhancement and improving wear resistance of material. Fibre Bragg grating fitted tuyere has been manufactured to measure temperature and predict heat load on tuyere. These inputs are used in numerical model to evaluate cooling performance. It has been found that existing tuyere designs seem to overlook the criticality of boiling which may deteriorate cooling performance. Effort has been concentrated to modify the design of cooling circuit to suppress boiling. Properties of existing protective architectures have been determined, and subsequently effort has been devoted to enhance the wear resistance of the material by putting refractory protection. All these combined efforts have enhanced the service life of tuyere by 20%.
PubDate: 2021-03-12

• On the Degradation Behavior and Osteogenic Differentiation of
PLGA/ICA/Ca-P Hybrid Coating on Pure Mg
• Abstract: In this study, the PLGA/ICA/Ca-P hybrid coating was fabricated on pure Mg to enhance corrosion resistance and osteogenic differentiation for pure Mg. The results showed that doping PLGA on the Ca-P pretreatment coating on the pure Mg could improve the defects (micropores and cracks) of the Ca-P pretreatment coating, as a result of the better corrosion resistance compared with the pure Mg and Ca-P coating. More importantly, the in vitro results of MTT and quantitative PCR analysis suggested that icariin addition on the PLGA/Ca-P hybrid coating could promote the osteogenic-related gene expression with respect to the other groups.
PubDate: 2021-03-12

• Variability in Fatigue Life of Near- α Titanium Alloy IMI 834
• Abstract: Most aero-engine components and structures are subjected to life critical fatigue loads during service. Near-α titanium alloy IMI 834 is one candidate aero-engine material that is used as high-pressure compressor discs due to its superior fatigue strength and creep resistance. The effect of heat treatment on the microstructure and high-cycle fatigue behaviour of the material has been studied and reported here. The alloy was solution-heat-treated at 1060 °C and subsequently quenched in different media. A strong effect of quench media (cooling rate) on high-cycle fatigue life has been observed. Fractographic investigations were performed to correlate the fracture micro-mechanism with heat treatment. Further, a generalized stress-life model has been deduced from the fatigue data and integrated with finite element analysis to develop a fatigue model for the alloy.
PubDate: 2021-03-10

• Microstructure and Mechanical Properties of the Joint Fabricated Between
Stainless Steel and Copper Using Gas Metal Arc Welding
• Abstract: The present paper dealt with characterizing microstructure and mechanical properties of the dissimilar weldment between stainless steel and copper obtained by gas metal arc welding using HS201 filler material. The results showed that the copper/weld interface was free of any defects, while the stainless steel/weld interface consisted of a melted unmixed zone with inhomogeneous distribution of composition. The weld showed a hybrid microstructure, which contained significant amount of steel globules and dendrites with different sizes. The hardness distribution of the weld was inhomogeneous, and an obvious reduction in microhardness of the heat-affected zone of copper was observed compared to that of the base metal of copper. Furthermore, all tensile specimens fractured at the heat-affected zone of copper, and the average tensile strength of welded joint reached 209.5 MPa.
PubDate: 2021-03-08

• Plane Strain Compression of Nb-10Hf-1Ti alloy: Effect on Microstructure
and Micro-Texture
• Abstract: The development of microstructure in the course of warm deformation of niobium-10 hafnium-1 titanium (wt%) alloy (C103) was studied by plane strain compression (PSC) testing in the range of 500–650 °C and two strain rates (ἑ) 0.01 and 1 s−1 which are commercially being practiced for rolling of the alloys. A total of 75% reduction in thickness was imparted to the samples during the warm deformation. The purpose of the study was to establish the warm rolling process parameters (ἑ and T) useful in the optimization of thermomechanical processing schedules to realize thin sheets of this difficult to process refractory material. Weak softening was noticed at temperatures of 600 °C (~ 0.35Tm) and above in the stress–strain plots. Partial dynamic recrystallisation was observed at the regions where maximum strain was observed in the sample during deformation at high temperatures as evidenced by electron backscatter diffraction (EBSD). Samples deformed in the temperature range of 500 °C to 600 °C and at ἑ of 1 s−1 showed dynamic recovery. High angle grain boundary fraction is higher for the sample deformed at a temperature of 650 °C and ἑ of 0.01 s−1 compared to the sample deformed at a ἑ of 1 s−1. Based on detailed microstructural observations, it was concluded that C103 alloy can be warm rolled at a temperature of 650 °C and ἑ of 0.01 s−1 to obtain localized dynamically recrystallized grain structure in the material and it is expected that a dynamic recrytallization will further advance with increase in reduction during deformation.
PubDate: 2021-03-07

• Plant Layout Development for Integrated Steel Plant for Capacity
Expansion: Design Approach
• Abstract: After finalization of process flow for the capacity expansion of an Integrated Steel Plant, considering the overall design requirements and inter-relationship amongst new and existing facilities, overall layout is developed on available space. Optimization of layout is proposed considering sizes, locational relationship of new units with existing operating units, required limiting conditions, transportation logistics and other auxiliary facilities. Prime objective of layout optimization should be proper utilization of available space which has been identified for expansion. Optimized layout can be developed through 3D integrated approach, which considers a common digital model of the entire plant. It can be achieved by merging the engineering output from various vendors, merging the model of existing plants obtained from works, surveys, and vendors so as to create a seamless layout. The final layout shall be best possible and can be executed in time bound manner.
PubDate: 2021-03-06

• Corrosion Studies of Hf 64 Cu 18 Ni 18 Metallic Glass in Acidic and
Alkaline Media
• Abstract: In the present paper, the corrosion behavior of Hf-rich Hf64Cu18Ni18 (at%) metallic glass (MG) was studied in acidic and alkaline media using electrochemical polarization experiments. Three different molar solutions of NaOH and HCl were used for the experiments. The results show that the glassy alloy possesses significantly high corrosion resistance in alkaline solution than acidic one. Pits are observed on the sample in acidic media, whereas alkaline sample does not show pitting. In both the solutions, primarily, HfO2 is formed on the surface as a corrosion product. The corroded surface is non-uniformly distributed on the ribbon and found to decrease with concentration of NaOH. The non-uniform distribution is attributed to inhomogeneity in the ribbon sample. In case of HCl solution, corroded surface increases with the increase in HCl concentration. Furthermore, an attempt has been made to understand the corrosion mechanism of this MG in view of phases formed during the experiment.
PubDate: 2021-03-03

• Influence of Pre-Ratcheting Fatigue on Tensile Behavior of Modified
9Cr-1Mo Steel at Ambient Temperature
• Abstract: Modified 9 Cr-1Mo steel is a material of prime significance in power plants used for components of steam generation units. The phenomenon of ratcheting involves aggregation of plastic strain in each cycle during asymmetric cyclic stressing. In the present study, the role of prior ratcheting has been studied on tensile behavior of this steel at ambient temperature. Cyclic tests were performed under uniaxial stress under the three parameters namely mean stress (σm), stress amplitude (σa) and stress rate $$(\dot{\sigma })$$ for 200 cycles. Tensile behavior of the pre-ratcheted samples was evaluated at ambient temperature at a strain rate of 10−4 s−1. It was found that pre-ratcheting enhanced the yield strength (SYS) and tensile strength (SUTS) but reduced the ductility. The results are discussed in terms of cyclic hardening resulting from the pre-ratcheting under different variables, and the internal microstructural changes are revealed by transmission electron microscopy.
PubDate: 2021-03-02

• Investigation of Powder Mixed EDM of Nickel-Based Superalloy Using Cobalt,
Zinc and Molybdenum Powders
• Abstract: Powder mixed electric discharge machining is one of the important recent trends in electric discharge machining process which successfully addresses some of the issues associated with the normal die-sinking EDM process. Since the performance of powder mixed EDM is based on work and tool material combination besides other process parameters, various research works have been reported by experimenting with different materials. This work aims to study the influence of different tool materials on powder mixed EDM of a nickel-based superalloy, Nimonic 75, along with using three different powders (zinc, Co and Mo). Nimonic 75 material is being widely used in aerospace and high-temperature applications. Besides the powders type and tool material (Cu, brass and W), the other process parameters are concentration of powder (Cp), peak current (Ip) and pulse on time (Ton). The performance measures considered in this study are material removal rate (MRR), tool wear rate (TWR) and surface roughness (SR). The experiments were conducted based on Taguchi’s orthogonal array (L27 313). Using ANOVA, it was identified that peak current and tool material had much greater influence over MRR, TWR and SR. Zinc powder yielded highest MRR, and molybdenum powder produced good finish of the components. It was also observed that copper yielded highest MRR, tungsten experienced low TWR, and brass tool electrode produced very smooth surface finish.
PubDate: 2021-02-26

• Globularization of Primary Phase of Al–7Si–0.3Mg Alloy During Cooling
Slope Processing and Isothermal Holding
• Abstract: This study is aimed towards process design for semi-solid slurry generation of Al–7Si–0.3Mg alloy using cooling slope as a slurry maker, and subsequent isothermal holding to promote globularization of slurry microstructure. The study primarily reports globularization mechanism of cooling slope processed semi-solid slurry of the alloy, and efforts are directed to establish process control by investigating the effect of coarsening during isothermal holding on the shape, size and distribution of primary Al grains. As an outcome of this study, we propose a modified Lifshitz–Slyozov Wagner equation to quantify the effect of coarsening mechanisms prevailing during isothermal holding of the said alloy slurry. The evolution of primary phase morphology due to addition of grain refiner has also been studied and ideal processing condition is identified for the end goal of component development through rheo pressure die casting route.
PubDate: 2021-02-25

• Influence of Microstructural Characteristics on Ballistic Performance and
Its Mode of Failure in  Shielded Metal Arc Welded Ultra-High Hard Armor
Steel Joints
• Abstract: The welding of ultra-high hard armour (UHA) steel is highly challenging due to their higher hardness (600 HV) and higher carbon equivalent (0.80). In this investigation, 15-mm-thick UHA steel plates are welded by shielded metal arc welding (SMAW) process using three different consumables such as austenitic stainless steel (ASS), low-hydrogen ferritic steel (LHF), and duplex stainless steel (DSS). The joints were tested against a 7.62 × 54 mm Armor-piercing (AP) projectile. All three joints successfully stopped the projectile at weld metal and interface (weld/HAZ) without perforation. The ballistic performance and mechanical properties are improved than the currently used ASS electrodes, and a new method to study the mode of failure at weld metal and interface was introduced. Striations and microcracks are preferred modes of failure than wear debris in the weld metal, and soft/hard mode is preferred over soft/soft and hard/hard modes of failure at the interface.
PubDate: 2021-02-24

• Influence of Aging Temperature on Functional Fatigue Behavior of a Ti 50
Ni 45 Cu 5 Shape Memory Alloy
• Abstract: Smart actuators, using materials with a memory, are an attractive alternative to conventional actuators due to their unique properties, such as high energy density, low power-to-weight ratio, simplicity of design, and miniaturization of size. However, the continuous cyclic operation of such devices, within their transformation temperature range, leads to the degradation of their functional properties. In this paper, the degradation of functional properties, such as recovery strain, permanent strain, and critical transition temperatures, of an Ni45Ti50Cu5 (at.%) shape memory alloy, aged at four different temperatures, ranging from 450 to 600 °C, was experimentally investigated under constant stress. The results reveal that all alloys underwent a single-step transition from B2 → B19’ at all aging temperatures. The aging temperature has a significant impact on recovery strain and permanent strain. The permanent strain accumulation after every cycle is minimized as the temperature of aging is raised to 550 °C due to the strengthening of the matrix by precipitate particles. Above this temperature, it starts to increase due to the coarsening of the precipitate particles. Aging treatment also helps to achieve faster cyclic stability during thermomechanical cycling.
PubDate: 2021-02-23

• A Comparative Study on Deformation Behaviour of Superelastic NiTi with
Traditional Elastic–Plastic Alloys in Sub-micron Scale
• Abstract: A nanoindentation-based study is conducted to analyse the small-scale deformation behaviour of superelastic NiTi-based shape memory alloy. The mechanism is compared with respect to that for traditional elastic–plastic ferrous and non-ferrous alloys: ferritic stainless steel of grade 409 and Al. To develop a comprehensive insight into the deformation behaviour, various experiments including nanoindentation, optical microscopy, X-ray diffraction, differential scanning calorimetry are performed on all alloy systems. This detailed study demonstrates that structural properties are primarily controlled by the crystal structures of the phases present in the respective alloy systems. Among these three studied alloys, the highest and lowest nano-hardness is realized for the steel and Al, respectively. Intermediate hardness is noted for the NiTi alloy. Nevertheless, the localized deformation characteristics of the superelastic alloy appeared to be entirely different in relation to that for the ferrous and non-ferrous materials. Most importantly, a fourfold increment in the depth recovery is realized for the NiTi alloy in contrast to the traditional metallic system. To understand this exceptional recovery, detailed analysis is performed on the unloading response of all the alloys. The crucial role of reversible stress-induced martensitic transformation in contributing towards the depth recoverability for superelastic NiTi alloy is thereby revealed.
PubDate: 2021-02-22

• Challenges in Qualifying Additive Manufacturing for Turbine Components: A
Review
• Abstract: Gas turbine engine advancements have been enabled by innovation in materials and manufacturing technologies. The evolution of additive manufacturing (AM) has changed the face of direct digital technologies for the rapid production of models, prototypes, and functional parts including repair and maintenance for turbine engines. Metal 3D printing is poised to be an enabler for the next industrial revolution in enabling advancements in turbine engine performance. While there has been tremendous efforts on research and development in utilizing this versatile technology, the number of qualified metallic parts that are running in the engine has not been commensurate with the applied research and development efforts and the benefits that the AM technology offers. This review addresses some of the key technical issues that are currently limiting the prolific usage of AM as a successful vehicle for accelerated progress in gas turbine engines.
PubDate: 2021-02-19

• Damage Tolerance Behavior of a Nickel-Based Super-alloy GTM718 Under
• Abstract: In this study, the damage tolerance behavior in terms of fatigue crack propagation behavior of an aero-engine material under a standard variable amplitude load sequence was predicted and compared with experimental results. The constant amplitude (CA) fatigue crack growth rate (FCGR) behavior of GTM718, a nickel-based super-alloy, was determined at various stress ratios R = σmin/σmax ranging from R = 0.1 to 0.7. The empirical fatigue crack growth law was derived from this data in terms of two-parameter crack driving force, ΔK*. Then, the fatigue crack propagation behavior of GTM718 under a standard cold-TURBISTAN variable amplitude load sequence was predicted using cycle-by-cycle approach and using the CA fatigue crack growth law. Also, experimental fatigue crack growth behavior under the same cold-TURBISTAN variable amplitude load sequence was determined and compared with predicted results. A fairly good correlation was observed with predicted and experimental results.
PubDate: 2021-02-17

• Microstructure and Properties of In situ Synthesized TiC/Graphene/Ti6Al4V
• Abstract: A graphene (Gr)/Ti6Al4V composite coating was prepared by laser cladding, and the microstructure and the properties were studied. The results showed that an in situ synthesis between Gr and Ti occurred and TiC was formed. The TiC was homogeneously distributed. The α’ acicular martensite was formed at the bottom of the coating during the rapid solidification process, and a good metallurgical bond was formed between the coating and substrate. The TiC and the self-lubrication of Gr improved the wear resistance of coating. And the wear mechanism changed from more serious abrasive and adhesive wear to a mild wear with fine scratches. Meanwhile, severe oxidative wear occurred in the coating and substrate under high-temperature friction and wear. The corrosion resistance of the coating was also improved. The corrosion morphology changed from denudation and pitting to local pitting. The Gr and TiC in the coating effectively preventeds the corrosion.
PubDate: 2021-02-16

• The Effect of the Elements Co and Ni on Wear Behaviour of Bronze Alloys
Produced by the Hot Pressing Method
• Abstract: In this study, samples were produced via the Hot Isostatic pressing method by adding the elements Ni and Co at different rates into Cu–Sn (85/15) alloys. Due to their physical, thermal, and wear properties, Cu–Sn bronze alloys are widely used in journal bearings and bushings in automotive applications. In order to improve the mechanical properties of Cu–Sn alloys, it was aimed to increase their hardness and wear resistances by adding the elements Ni and Co at certain rates. By taking SEM images of the produced samples, their microstructures were examined, the hardness measurements were carried out using Brinell hardness measurement method and the porosity rates were determined based on Archimedes’ principle by conducting density measurements. Additionally, the effects of Ni and Co elements added to improve the wear properties of these alloys on wear were investigated.
PubDate: 2021-02-15

• Effect of P 2 O 5 , CaF 2 and Basicity on the Viscosity and Structure of
La 2 O 3 -Bearing Calcium–Silicate–Aluminum Slag System
• Abstract: The effects of the P2O5 and CaF2 contents and the basicity on the viscosity of CaO–SiO2–Al2O3–La2O3 slag systems were investigated using the rotating cylinder method during the continuous cooling process. The structural characteristics of the quenched slag samples were clarified by Fourier transform infrared and Raman spectroscopies. The results showed that the slag viscosity and break temperature gradually increased with increasing P2O5 content from 0 and 2.5 to 5 wt% at each basicity of 0.87, 1.0 or 1.17; meanwhile, the viscosity increased as the P2O5 content increased at a greater level at low basicity. The addition of CaF2 obviously reduced the viscosity and break temperature of slag. The increase in the basicity from 0.87 and 1.0 to 1.17 decreased the viscosity of the slags under the present composition range, but raised the break temperature. The maximum viscosity reduction by the basicity occurred in the slag containing 5 wt% P2O5, while the minimum occurred in the slag containing 5 wt% CaF2. P2O5 acted as a network former in the molten slag and increased the polymerization of the silicate and phosphate complex anions, corresponding to an increase in the slag viscosity. CaF2 played a major role in the depolymerization of the silicate and phosphate complex anions in this study.Kindly check and confirm the edit made in the title.The title was no problem.
PubDate: 2021-02-15

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