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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。
Neodymium glass pulsed laser was used to study the laser shock enhancement of ЭП866 heat-resistant martensitic stainless steel for aero-engines. The results show that the microstructure consists of martensite laths and precipitated carbides, which impinge on the surface with high density dislocations and entanglement after tempering for many times, and retain the entangled structure after tempering, resulting in a large number of nano-precipitates. Multiple impacts can cause the surface to introduce residual compressive stress of higher amplitude, with an amplitude of -715.4 MPa, and the residual compressive stress increases with the increase of spot overlap. 500 ~ 650 ℃ after tempering the residual compressive stress decreased by 50%, with good thermal stability, the impact of the number of times less affected.