激光冲击强化对TC17硬度和拉伸性能的影响

Influence of Laser Shock Peening on Hardness and Tensile Property of TC17

采用脉冲能量为7 J的纳秒激光对TC17钛合金进行激光冲击强化处理。采用扫描电镜(SEM)、透射电镜(TEM)对TC17激光冲击的微观组织进行观察,并分别采用显微硬度仪、电子万能材料试验机对材料的显微硬度、拉伸性能进行测试。结果表明,激光冲击强化后,在材料表面形成微塑性变形,在冲击区域近表面形成高密度位错。与基体材料相比,冲击区域的显微硬度提高50 HV,抗拉强度提高56 MPa,屈服强度降低11 MPa。

The laser shock peening treatment of TC17 titanium alloy was carded out by nanosecond laser with pulse energy of 7 J. The morphologies of TC17 alloy after laser shocking peening （LSP） were observed by SEM and TEM. The microhardness and tensile properties of the alloy were tested by microhardness tester and electronic universal material testing machine. The results show that by LSP, micro plastic deformation appears on the surface of the alloy and the impact zone near surface generates high density dislocations. Compared with base material, the microhardness of the impact zone increases by 50 HV, the tensile strength increases by 56 MPa and the yield strength decreases by 11 MPa.