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利用激光冲击强化技术分别对奥氏体不锈钢 1Cr18Ni9Ti和镍基高温合金 GH30进行了表面强化处理 ,观察了激光表面强化处理后 1Cr18Ni9Ti和 GH30显微组织与结构的变化 ,测定了1Cr18Ni9Ti和 GH30的显微硬度和残余应力 .结果表明 ,激光表面强化处理后的 1Cr18Ni9Ti和GH30冲击区微观结构中出现很高的位错密度和大量的孪晶 ,冲击区的显微硬度得到较大提高 ,冲击区表面获得了较高的残余压应力 . 1Cr18Ni9Ti冲击区还发生了形变诱发马氏体相变 .
The surface of the austenitic stainless steel 1Cr18Ni9Ti and the nickel base superalloy GH30 were treated by laser shock and the microstructures and structures of 1Cr18Ni9Ti and GH30 after laser surface strengthening were observed. The microstructures and structures of 1Cr18Ni9Ti and GH30 Hardness and residual stress.The results show that the dislocation density and a large number of twins appear in the microstructure of 1Cr18Ni9Ti and GH30 after laser surface strengthening, and the microhardness of the impact zone is greatly increased, and the surface of the impact zone is obtained A higher residual compressive stress deformation-induced martensitic transformation also occurred in the impact zone 1Cr18Ni9Ti.