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
激光技术 ЭП866不锈钢 激光冲击强化 残余压应力 热处理 微观结构 laser technique ЭП866 stainless steel laser shock processing compressive residual stress heat treatment microstructure
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.