激光对2Cr13冲击韧性影响研究

Impact toughness of 2Cr13 martensite stainless steel induced by laser

为了研究激光冲击强化对马氏体不锈钢2Cr13冲击韧性的影响,选用不同激光工艺参数对2Cr13马氏体不锈钢进行激光冲击强化,测定了激光冲击前后的冲击韧性,残余应力,观察了冲击试样的显微组织以及冲击断口。研究结果表明:选择合适的激光功率密度能有效改善材料的冲击韧性,过大的激光功率密度反而降低材料的冲击韧性性能;激光冲击后在表层产生了较高的残余压应力;激光冲击区的材料组织发生碎裂;从冲击断口观察发生了沿晶断裂,激光冲击增加了韧窝的产生,冲击韧性得到了提高。

In order to research the influence of laser shock processing（LSP） on 2Cr13 steel＇s impact toughness,2Cr13 martensite stainless steel was strengthened by laser shock processing. Impact toughness and residual stress were meas- ured. The mierostructure and fracture surface were observed as a function of laser shock processing parameters. The re- suits show that the impact toughness increases as the laser power density increases when laser power density is within an appropriate range. The compressive residual stress is induced by laser shock processing. The micro-structure of the shock zone was fractured and studied. From the micrograph of the fracture surface, the morphologies exhibit brittle fracture. The dimple is increased with LSP,so the impact toughness is improved.