Abstract
Laser peening without protective coating (LPwC) has been performed on austenitic stainless steel (SS304) with a power density of 9 GW cm−2 and peening passes of one, three and five. Effect of single and multiple laser peening on the residual stress distribution, work-hardening, surface roughness, phase transformation, and wettability has been studied using XRD, EBSD, surface profilometer and goniometer. A maximum compressive residual stress of - 581 MPa and work hardening depth that extended beyond 500 μm were observed with 5 peening passes. Further, an increase in austenite to martensite transformation (γ → α′) from 9.4 (unpeened) to 18.5% was observed for 5 peening passes. The average grain size reduced to 11.53% for five-time peened samples compared to single-time peened samples. Wettability studies revealed hydrophilic to hydrophobic transformation after laser peening.
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We thank Aeronautics R&D Board, India for the financial support (Grant No. ARDB/GTMAP/01/2031839/M/I), Vellore Institute of Technology (VIT), Vellore for the infrastructure and constant support throughout the project and Sophisticated Analytical Instrument Facility (SAIF) at IIT-Bombay for EBSD measurements.
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Praveenkumar, K., Swaroop, S. & Manivasagam, G. Residual Stress Distribution, Phase Transformation, and Wettability Characteristics of Laser Peened Austenitic Stainless Steel. J. of Materi Eng and Perform 31, 6846–6857 (2022). https://doi.org/10.1007/s11665-022-06748-x
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DOI: https://doi.org/10.1007/s11665-022-06748-x