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Deformation-Induced Martensite And Nanotwins By Cryogenic Laser Shock Peening Of Aisi 304 Stainless Steel And The Effects On Mechanical Properties, Chang Ye, Sergey Suslov, Dong Lin, Gary Cheng
Deformation-Induced Martensite And Nanotwins By Cryogenic Laser Shock Peening Of Aisi 304 Stainless Steel And The Effects On Mechanical Properties, Chang Ye, Sergey Suslov, Dong Lin, Gary Cheng
Dr. Chang Ye
Laser shock peening (LSP) of stainless steel 304 was carried out at room and cryogenic temperature (liquid nitrogen temperature). It was found that the deformation-induced martensite was generated by LSP only when the laser-generated plasma pressure is sufficiently high. Compared to room temperature laser shock peening (RT-LSP), cryogenic laser shock peening (CLSP) generates a higher volume fraction of martensite at the same laser intensity. This is due to the increase in the density of potential embryos (deformation bands) for martensite nucleation by deformation at cryogenic temperature. In addition, CLSP generates a high density of deformation twins and stacking faults. After …