表面喷丸改善耐热钢主轴疲劳性能的试验研究
Experimentally Studying Fatigue Life Enhancement of Heat-resistance Steel Spindle by Surface Shot-peening
黄春莲，袁海洋
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作者单位：长沙职业技术学院 机械工程系
湖南信息职业技术学院 机电工程系
中文关键字：耐热钢；主轴；残余应力；喷丸；应力敏感性
英文关键字：heat-resistant steel; spindle; residual stress; shot-peening; stress sensibility
中文摘要：对1Cr12Ni3Mo2VN耐热钢主轴试件引入表面喷丸处理工艺，借助无损残余应力测试手段分析喷丸强度与喷丸覆盖率对试件表层残余应力分布的影响，并研究不同工况中的疲劳性能改善效果。结果表明，二者主要作用是在保持高应力峰值的基础上增大或巩固残余应力影响深度与应力峰值所在层深，但也增加了应力敏感性，造成应力大幅松弛。试件的疲劳寿命在室温下主要由喷丸强度控制，而在高温下还将受喷丸覆盖率的显著影响。
英文摘要：Surface shot-peening processes were carried out on spindle specimen made of 1Cr12Ni3Mo2VN heat-resistant steel. Effects of shot-peening intensity and shot-peening coverage were analyzed on surface residual stress filed by non-destructive residual stress measurement, and fatigue performance enhancements from shot-peening under different working conditions were studied. The results show that the main role of shot-peening intensity and coverage is increasing or strengthening peak stress depth and stress influencing depth and remaining a larger residual peak stress simultaneously. However, stress sensibility is also increased which results a large stress relaxation. Fatigue life of the steel is mainly controlled by shot-peening intensity at room temperature while also influenced dramatically by shot-peening coverage at high temperature.