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激光冲击强化(LSP)可以显著提高铸造镍基高温合金K417的抗疲劳强度。为提高K417在高温下的抗氧化和燃气腐蚀性能必须进行渗铝处理,研究了渗铝对K417激光冲击强化效果的影响。由残余应力在900℃保温的变化分析表明,虽然冲击后产生的残余压应力在高温下会部分释放,但是根据振动疲劳试验,激光冲击强化后材料疲劳强度为285.5 MPa,再渗铝后疲劳强度提高到339.5 MPa。结果表明,渗铝和激光冲击强化工艺可同时使用。
Laser shock strengthening (LSP) can significantly improve the fatigue strength of cast Ni-base superalloy K417. In order to improve the oxidation resistance and gas corrosion resistance of K417 at high temperatures, aluminizing treatment must be carried out to study the impact of aluminizing on the K417 laser shock enhancement effect. The analysis of residual stress at 900 ℃ shows that although the residual compressive stress after impact is partially released at high temperature, the fatigue strength of the material after laser shock strengthening is 285.5 MPa according to the vibration fatigue test, and the fatigue strength after re-aluminizing Increase to 339.5 MPa. The results show that aluminizing and laser shock strengthening can be used simultaneously.