Characterization of weld strength and impact toughness in the multi-pass welding of super-duplex stainless steel UNS 32750 |
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| Affiliation: | 1. School of Mechanical & Building Sciences, VIT University, Vellore 632014, India;2. Saraswathy Velu College of Engineering, Vellore, India;1. Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia;2. School of Computer Science, Engineering & Mathematics, Flinders University, Bedford Park, SA 5042, Australia;1. FMC Technologies, South America Technology Center – Technology Park, UFRJ, Cx. Postal CEP 21941-907, Rio de Janeiro, RJ, Brazil;2. Laboratório de Ensaios Não Destrutivos, Corrosão e Soldagem – LNDC, COPPE Universidade Federal do Rio de Janeiro – UFRJ, Cx. Postal 68505 CEP 21945-970, Rio de Janeiro, RJ, Brazil;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran |
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| Abstract: | This paper investigates the weldability, metallurgical and mechanical properties of the UNS 32750 super-duplex stainless steels joints by Gas Tungsten Arc Welding (GTAW) employing ER2553 and ERNiCrMo-4 filler metals. Impact and tensile studies envisaged that the weldments employing ER2553 exhibited superior mechanical properties compared to ERNiCrMo-4 weldments. Microstructure studies performed using optical and SEM analysis clearly exhibited the different forms of austenite including widmanstatten austenite on the weld zone employing ER2553 filler. Also the presented results clearly reported the effect of filler metals on strength and toughness during the multi-pass welding. This research article addressed the improvement of tensile and impact strength using appropriate filler wire without obtaining any deleterious phases. |
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