Advances in Surface Engineering IV: On-Demand Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Surface Engineering Committee
Program Organizers: Arif Mubarok, PPG; Bharat Jasthi, South Dakota School of Mines & Technology; Tushar Borkar, Cleveland State University; Mary Lyn Lim, PPG Industries; Rajeev Gupta, North Carolina State University

Monday 8:00 AM
March 14, 2022
Room: Materials Processing
Location: On-Demand Poster Hall


Tribological and Wetting Behavior of Laser Shock Peened High Pressure Cold Sprayed (HPCS) Duplex 316L Stainless Steel: Alessandro Ralls1; Bo Mao2; Mohammadreza Daroonpravar3; Pradeep Menezes1; 1University of Nevada, Reno; 2Shanghai Jiao Tong University; 3University of Nevada, Reno; ABS Industries
    In this work, the effect of laser shock peening (LSP) as a post-surface processing technique for high-pressure cold-sprayed (CS) duplex 316L stainless steel (SS) was investigated. It was found that the severe plastic deformation induced from the plasma pressure resulted with surface work-hardening which consequentially improved the tribological behavior of the specimens. The surface integrity of the CS deposits were also largely preserved due to the already work-hardened surfaces induced from the CS process. In fact, despite small change in surface roughness, the surface energies of the LSP substrates were decreased as a function of laser intensity. It was found that the air pockets from the modified surface morphology was the primary factor for improved wettability as per the Cassie-Baxter model. Based on these results, LSP has been determined as a useful method to enhance the surface properties of CS 316L SS deposits.

Understanding the Mechanism of Laser Shock Peened Austenitic Stainless Steel Welds: Merbin John1; Alessandro Ralls1; Manoranjan Misra1; Pradeep L. Menezes1; 1University of Nevada, Reno
    In the present study, laser shock peening (LSP) was conducted on welded austenitic stainless steel (ASS) widely used in dry storage canisters (DSC’s) for spent nuclear fuel storage applications. The weld is prepared using the gas tungsten arc welding (GTAW) technique. LSP experiments were performed using two different laser intensity and overlap ratios. The introduction of LSP changed residual tensile stress (RTS) to residual compressive stress (CRS) in the weld and heat-affected zone (HAZ). The maximum magnitude of RCS is induced at a depth of 75-100 µm from the surface of weld plates. The maximum value of induced RCS is 80%-90% of the base material’s yield strength. In addition, significant grain refinement is observed in the weld and HAZ, which improves the surface integrity and prevents the failures of the components. The mechanisms for enhanced mechanical properties of welded components will be demonstrated.