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Microstructure and Work Hardening Behavior of Micro-plasma Arc Welded AISI 316L Sheet Joint

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Abstract

The aim of this research is to investigate the microstructural changes and work hardening behavior of AISI 316L 0.5-mm-thick sheet due to micro-plasma arc welding. AISI 316L similar sheets were welded in single-pass square butt joint configuration. The microstructure in the fusion zone typically contains a variety of complex δ-ferrite-austenitic structure, which significantly increased hardness value compared to the base material because of rapid solidification of the weld pool. Systematic tensile test was performed to investigate strain rate sensitivity of the welded joint under quasi-static loading conditions. The multistage work hardening behavior was determined by Kocks–Mecking (K–M) model and differential Crussard–Jaoul analysis. In both the cases, stage III work hardening behavior and stage IV work hardening behavior were observed. The stress–strain curves of welded specimen at different strain rates were analyzed in terms of Hollomon, Ludwik and Swift equations to determine work hardening exponent values. The welded joints were ruptured in the transition zone of heat affected and fusion zones. The fractographic observation exhibited variation in dimple and void density over strain rate from 0.0001 to 0.0015 s−1.

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Acknowledgments

This research work is supported by the Department of Mechanical Engineering and Central Instruments Facility, IIT Guwahati, by providing experimental and testing facilities.

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  1. Department of Mechanical Engineering, IIT Guwahati, Guwahati, 781039, India

    Dipankar Saha & Sukhomay Pal

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Saha, D., Pal, S. Microstructure and Work Hardening Behavior of Micro-plasma Arc Welded AISI 316L Sheet Joint. J. of Materi Eng and Perform 28, 2588–2599 (2019). https://doi.org/10.1007/s11665-019-04064-5

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  • DOI: https://doi.org/10.1007/s11665-019-04064-5

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