Abstract
The effects of laser shock processing (LSP) treatment on TP347H austenitic steel were investigated through exploring the residual stress distribution, the evolutions of microstructure and the oxidation behavior in supercritical water (SCW, 640 °C/27 MPa). Results show that the plastic deformation layer (PDL) and the compressive residual stress (about −550 MPa maximum value) were detected on TP347H after LSP, and the fine grain layer existed in PDL. Due to the compressive residual stress in PDL, TP347H after LSP presented an excellent oxidation resistance in SCW, presenting oxidation rate of 0.5–0.8 times compared with TP347H. This was mainly attributed to the increased molar volume of Cr in PDL, leading to the existence of the stress-dependent chemical potential (μs) of Cr. μs promoted the formation of Cr2O3 and FeCr2O4, and improved the diffusion flux of Cr during oxidation.
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