中国激光, 2016, 43 (11): 1102009, 网络出版: 2016-11-10   

多次激光冲击强化对ЭП866马氏体不锈钢组织 及残余应力的影响

Effect of Multiple-Laser Shock Processing on Microstructure and Residual Stress of ЭП866 Martensitic Stainless Steel
作者单位
1 江苏大学材料科学与工程学院, 江苏 镇江 212013
2 上海交通大学密西根学院, 上海 200240
3 江苏理工学院机械工程学院, 江苏 常州 213000
摘要
采用钕玻璃脉冲激光器进行了航空发动机用ЭП866耐热马氏体不锈钢激光冲击强化实验研究。结果表明,不锈钢组织由马氏体板条和析出碳化物组成,多次冲击表层产生高密度位错缠结,回火后仍保留其缠结结构,产生大量的纳米析出相。多次冲击可使表层引入更高幅值的残余压应力,幅值达-715.4 MPa,且残余压应力值随光斑搭接次数增加而增加。500~650 ℃回火处理后残余压应力下降幅度达到50%,具有良好的热稳定性,冲击次数对其影响较小。
Abstract
Laser shock processing tests of ЭП866 heat-resistant martensitic stainless steel for aero-engine were carried out with a Nd glass laser. The results show that the microstructure of stainless steel is composed of martensite laths and carbide precipitation. High density dislocation entanglement occurs in the surface layer during multi-impacts. After tempering treatment, the tangled microstructures still exist and more nano-sized precipitation occurs. Higher-amplitude compressive residual stress is produced in the surface layer by multi-impacts, whose amplitude can be reached to -715.4 MPa, and residual compressive stress increases with the increase of the lap times. After tempering treatment at the temperature from 500 ℃ to 650 ℃, the residual compressive stress decreases by 50%, which shows good thermal stability and weak effect of the impact times.

张青来, 赵博, 张冰昕, 李兴成, 刘惠. 多次激光冲击强化对ЭП866马氏体不锈钢组织 及残余应力的影响[J]. 中国激光, 2016, 43(11): 1102009. Zhang Qinglai, Zhao Bo, Zhang Bingxin, Li Xingcheng, Liu Hui. Effect of Multiple-Laser Shock Processing on Microstructure and Residual Stress of ЭП866 Martensitic Stainless Steel[J]. Chinese Journal of Lasers, 2016, 43(11): 1102009.

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