为了研究激光冲击强化技术在高温部件上应用的可行性,研究了GH4133镍基高温合金激光冲击后强化效果的热稳定性.分别采用激光冲击强化、激光冲击强化加保温的方法进行处理,并利用SEM、显微硬度和残余应力的测试方法分析了温度对激光冲击处理后GH4133材料微观组织和力学性能的影响.通过冲击强化后涡轮叶片的高温疲劳试验验证强化效果的热稳定性,并分析其高温下的强化机制.结果表明,激光冲击强化可以在GH4133镍基高温合金表层产生较大残余压应力,细化晶粒;并且在温度作用下,激光冲击GH4133合金形成的细化晶粒在析出相的钉扎作用下具有 较好的热稳定性.另一方面残余压应力的应力集中减小,分布均匀.两者的共同作用提高了强化效果的热稳定性,有利于疲劳性能的提高.
In order to investigate the feasibility of laser shock peening (LSP) on the components suffering high temperature in work,the thermal stability of LSP effects on GH4133 nickel-based superalloy were studied.GH4133 nickel-based superalloy samples were treated by laser shock peening and laser shock peening+annealing separately.The thermal stability was examined by scanning electron microscopy (SEM),microhardness and residual stress tests.High-temperature fatigue of turbine blades was tested and the mechanism of fatigue life improvement was also discussed.Results show that high-amplitude residual compressive stress and grain refinement are generated,and precipitated phase of GH4133 alloy treated by LSP has a great impact on thermal stability for the refined grains.On the other hand,stress concentration slows up and distributes uniformly.Both of microstructure and residual compressive stress are propitious to fatigue life.
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