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提出了1Cr11Ni2W2MoV不锈钢激光冲击强化(LSP)后渗铝提高材料疲劳性能的工艺方法,采用振动疲劳试验方法研究了激光冲击强化后渗铝处理对材料疲劳性能的影响,并与激光冲击强化、渗铝状态进行了对比分析,实验结果表明,激光冲击强化后渗铝工艺方法显著提高材料的疲劳寿命。采用X射线衍射(XRD)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)分析研究了激光冲击强化后渗铝对材料微观组织的影响,讨论了这种工艺方法对材料性能提高的机理。结果表明,激光冲击强化后渗铝工艺增加了渗铝层厚度,但不影响其渗铝层的性能,同时使1Cr11Ni2W2MoV不锈钢基体表面晶粒呈梯度分布,从而提高了试样疲劳寿命。
The technological process of improving the fatigue properties of 1Cr11Ni2W2MoV stainless steel by laser shock strengthening (LSP) was proposed. The vibration fatigue test was used to study the effect of laser shocking and aluminizing treatment on the fatigue properties of the material. The effects of laser shock strengthening, The experimental results show that the laser impact enhanced aluminizing process significantly improves the fatigue life of the material. The effects of aluminizing on the microstructure of the material after laser shock strengthening were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The mechanism of this process on the material properties was discussed. The results show that the aluminized layer increases the thickness of the aluminized layer after laser shock strengthening, but does not affect the properties of the aluminized layer. Meanwhile, the grain size distribution of the 1Cr11Ni2W2MoV stainless steel substrate is gradient, which improves the fatigue life of the sample.