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Acta Metallurgica Slovaca
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1335-1532 - ISSN (Online) 1338-1156
Published by SciCell s.r.o. Homepage  [5 journals]
  • ATMOSPHERIC CORROSION BEHAVIOR OF HOT-DIP GALVANIZED AND CONTINUOUS
           GALVANIZED STEEL

    • Authors: Gökmen Sığırcık, Ömer Yıldırım, TUNÇ TÜKEN
      Pages: 117 - 126
      Abstract: Five years of outdoor atmospheric corrosion tests of hot dip galvanized steel samples were performed, for products of continuous galvanizing and after fabrication batch galvanizing processes. For the purpose of comparison between corrosion performances of these two different galvanizing process products, an industrial coastal area (Gemlik-Bursa/TURKEY) was chosen for outdoor testing, which fits into C4 type corrosive atmosphere definition, according to ISO 9223. Samples were studied in laboratory with accelerated salt spray exposure test and electrochemical methods. Corrosion products formed on exposed samples and cross section of coatings are analyzed by SEM. Lead is observed to change the corrosion characteristics of the coatings with change in constituents of environments. In saline electrolytes, alloying of lead is found to accelerate corrosion rate. This metal deposits as cluster on top layer of the galvanized coatings and acts as strong cathodes with respect to the zinc and accelerates the corrosion rate. It was determined that differences in dip and continuous galvanization processes cause dramatic differences in the elemental composition, morphology and regional hardness values of coatings. In the comparison of corrosion resistance, lower performance of the dip galvanized coating, although it is much thicker, has been shown due to the differences mentioned above.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1526
      Issue No: Vol. 28, No. 3 (2022)
       
  • VANADIUM ALLOYING IN S355 STRUCTURAL STEEL: EFFECT ON RESIDUAL AUSTENITE
           FORMATION IN WELDED JOINTS HEAT AFFECTED ZONE

    • Authors: Giulia Stornelli, Matteo Gaggiotti, Daniele Mirabile Gattia, Rolf Schmidt, Mirko Sgambetterra, Anastasiya Tselikova, Guido Zucca, Andrea Di Schino
      Pages: 127 - 132
      Abstract: The inter-critical heat affected zone (ICHAZ) appears to be one of the most brittle sections in the welding of high-strength micro-alloy steels (HSLA). Following multiple heating cycles in the temperature range between Ac1 and Ac3, the ICHAZ undergoes a strong loss of toughness and fatigue resistance, mainly caused by the formation of martensite-austenite constituent (MA). The presence of micro-alloying elements in HSLA steels induces variations in the formation of some microstructural constituents, more or less beneficial, which allow to improve the mechanical performance of a welded joint. The behavior in the inter-critical region of a S355 grade steel with 0.1wt% V addition is reported in this paper.  Five double-pass welding thermal cycles were simulated using a dilatometer, with the maximum temperature of the secondary peak in the inter-critical area, in the range between 720 ° C and 790 ° C. The residual austenite dependence on inter-critical temperature is analyzed and related to the hardness behavior.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1535
      Issue No: Vol. 28, No. 3 (2022)
       
  • THERMAL STABILITY AND THERMAL EXPANSION BEHAVIOR OF AlFeCoNiCu AS-CAST
           HIGH-ENTROPY DUAL-PHASE ALLOY

    • Authors: Kseniya Shmakova, Vladimir Tsepelev, Olga Chikova
      Pages: 133 - 139
      Abstract: This work is devoted to the thermal stability and thermal expansion of dual-phase AlFeCoNiCu as-cast high-entropy alloy of equiatomic composition. The mix FCC + BCC phases is in AlFeCoNiCu high entropy alloy. According to characterized by EDS-analysis, Fe and Co are almost uniformly distributed in both phases in comparison with other elements. The BCC phase is rich in Ni and Al, and the FCC phase is Cu. Our measurement results of hardness and elastic modulus values for inter dendrites (FCC phase) and dendrites (BCC phase) of as-cast AlFeCoNiCu alloy showed the difference between there. Hardness values for inter dendrites and dendrites: 3.4±0.4GPa and 4.1±0.6GPa. Elastic modulus values for inter dendrites and dendrites: 130.5±2.0GPa and 166.5±5.6GPa. The thermal stability of the phases presented in AlFeCoNiCu as-cast high-entropy alloy has been studied with dilatometry and differential scanning calorimetry (DSC). The DSC thermogram shows an endothermic peak at 1000K. The coefficient of thermal expansion (CTE) curve shows linear increment from room temperature up to 1370K from (10.6 ± 0.3)×10-6K−1 to (27.7 ± 0.3) ×10-6K−1. The CTE temperature curve also shows the peak at 1000K. The peaks in the CTE temperature and the DSC curve suggest a phase transformation with increasing temperature up to~1000K.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1551
      Issue No: Vol. 28, No. 3 (2022)
       
  • ANALYSING EFFECT OF QUENCHING AND TEMPERING INTO MECHANICAL PROPERTIES AND
           MICROSTRUCTURE OF 304-SS WELDED PLATES

    • Authors: SAURABH DEWANGAN, SOMNATH CHATTOPADHYAYA
      Pages: 140 - 146
      Abstract: The present work deals with analysis of mechanical performance and microstructural appearance of quenched and tempered SS-304 welded joints made by MIG welding technique. Since welding involves a critical solidification and thereby lots of internal stresses. Hence, heat treatment becomes important for removing stresses. In the present work, two SS-304 welded plates were heat treated. First plate was in quenched condition, and another was in tempered state. In both the plates, mechanical properties like tensile strength, impact strength, and hardness were analyzed. In addition, the microstructural attributes of base metal, heat affected zone and welded joints in both the welded plates were analyzed through optical microscope. The fractography analysis was also carried out in this study to get information about failure characteristics of samples after tensile testing. A significant change in mechanical properties, such as, 150% improvement in toughness, 7% reduction in weld-zone hardness, 3% improvement in yield strength and 6% reduction in ultimate tensile strength was obtained after tempering work. Also, the tempering process had reformed the grain structure by creating twins in base metal, and lathy δ ferrite & γ+δ lamella in HAZ. The martensite formed in quenched specimen had been completely recovered into fine γ+δ matrix.   
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1556
      Issue No: Vol. 28, No. 3 (2022)
       
  • NbC TRANSFORMATION DURING AGING IN HP40-Nb HEAT RESISTANT ALLOY

    • Authors: Matías Humberto Sosa Lissarrague, César Armando Lanz
      Pages: 147 - 150
      Abstract: In this work, the evolution of MC-type Nb-rich primary carbides in a 35Ni-25Cr-Nb-type refractory alloy, commonly known as HP40-Nb, and its transformation into Ni-Nb silicide known as G-phase (Ni16Nb6Si7), has been studied. For this purpose, the experimental technique of scanning electron microscopy was used together with X-ray microanalysis to detect changes in the chemical composition of niobium carbide over time and at a given aging temperature. The microstructure of the studied alloy, in its as-cast condition, consists of an austenitic matrix strengthened by a network of primary eutectic-like carbides rich in chromium and niobium of the M23C6 and MC types, respectively. During aging of the alloy at high temperatures, microstructural changes take place such as the secondary precipitation of M23C6 type carbides and the transformation of the primary Nb-rich carbide towards the Ni-Nb-rich silicide. It has been found that the transformation begins at the interface of the niobium carbides with the matrix, progressing towards their interior with the development of aging.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1562
      Issue No: Vol. 28, No. 3 (2022)
       
  • STUDY ON A TWO-PHASE LOW-TEMPERATURE MODEL OF THE FEATURES OF METAL
           TAPPING IN BASIC OXYGEN FURNACE

    • Authors: Tetiana Golub, Lavr Molchanov, Andrii Koveria, Lina Kieush
      Pages: 151 - 156
      Abstract: The paper shows the results of a study of the influence of the cut-off method of the slag by using destructible plugs on the quantitative indicators of the redistribution of slag and metal in the steel ladle during the metal tapping operation from the converter. The laboratory setup simulates a real 160-ton industrial top-blown oxygen converter, and a steel ladle at a scale of 1:18 has been used to fulfill the study. Water was chosen as a liquid steel imitator, and machine oil was chosen for slag with parameters that ensure the similarity of physical parameters in the metal-slag system. The physical modelling of the tapping process of a two-phase converter bath in the case of a destructible plug in the tap hole compared to the tapping option without it showed a significant positive effect of the presence of the plug in the initial period from the moment the converter is tilted.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1566
      Issue No: Vol. 28, No. 3 (2022)
       
  • THE THERMO-MECHANICAL AND MICROSTRUCTURAL INVESTIGATIONS OF AA 6061/GNPS
           WELDED JOINTS DEVELOPED BY CONTINUOUS DRIVE FRICTION WELDING

    • Authors: Mohammed Tashkandi, Mohammed Gamil
      Pages: 157 - 164
      Abstract: The paper provides a novel technique for merging graphene nanoplatelets (GNPs) within aluminium matrix (AA 6061) by continuous drive friction welding (CDFW). The welding processes were done at 1400 rpm and 2000 rpm rotational speeds with two different frictional loads 2000 N and 2500 N for 5 sec and 7 sec welding times. The welded joints were subjected to tensile and hardness tests. The heating-cooling cycles through the welding process were monitored. The microstructure investigation was performed using optical and scanning electron microscopes (SEM). The effect of welding conditions on the ultimate tensile strength (UTS) results of AA 6061 and AA 6061/GNPs were completely studied in details. There is no big detectable variation in the mean hardness values due to the GNPs addition. The best welding conditions for achieving the highest mechanical properties were defined. The presence of GNPs in the welded joints results in lower heating at the welded joint at the same welding conditions. Finer grain structure and homogeneous distribution for the GNPs within the welding zone were observed.
      PubDate: 2022-09-24
      DOI: 10.36547/ams.28.3.1573
      Issue No: Vol. 28, No. 3 (2022)
       
 
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