Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Surface Residual Stress Tailoring of 420 Martensitic Stainless Steel by Laser Shock Peening

Aprilia Aprilia1, Niroj Maharjan2, Jin Lee Tan1 and Wei Zhou1,a,b

1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

2Advanced Remanufacturing and Technology Centre, 3 CleanTech Loop, Singapore, 637143, Singapore


Laser shock peening is a surface enhancement method that is capable of altering the mechanical properties of materials. High energy pulsed laser beam is used to create shock waves that propagate through the material to induce compressive residual stresses. These compressive stresses are often beneficial for engineering components as they increase the crack resistance of the material. In this study, the laser shock peening of an annealed AISI 420 martensitic stainless steel (AISI 420SS) was studied. It was discovered that the microhardness and surface residual stress of a laser shock peened AISI 420SS sample varied significantly with the existence of ablative coating during the peening process. This finding shows that there is a potential to use ablative coating modifications in a laser shock peening process, to specifically tailor the surface residual stress of an AISI 420 martensitic stainless steel.

Keywords: Laser shock peening, Martensitic stainless steel, Residual stress, Thermal effect, Microhardness

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