Effect of Laser Remelting on Microstructure and Properties of 304 Stainless Steel
Xiang Li, Yujia Xu, Yichi Zhang and Yuanlong Chen
In order to study the effect of laser power density on the microstructure and properties of laser remelting 304 stainless steel, the temperature field and phase transition model of pulsed laser remelting stainless steel were established, and the temperature distribution and phase transition zone boundary during laser remelting were analyzed. The effects of laser power density on the microstructure, element distribution, hardness and corrosion resistance of the remelting layer on the surface of stainless steel were studied. The simulation and experimental results show that with the increase of laser power density, the surface temperature of stainless-steel increases gradually, and the surface quality of remelted layer becomes better and then worse. After laser remelting of 304 stainless steel, the hardness of the remelting layer is higher than that of the substrate, the self-corrosion potential shifts to the right, the self-corrosion current density decreases, and the corrosion resistance increases. Laser remelting technology is beneficial to improve the comprehensive properties of 304 stainless steel surface.
Keywords: Laser remelting, laser power density, 304 stainless steel, remelted layer, corrosion resistance