喷丸对水轮机转轮腐蚀疲劳裂纹扩展速率[da/dN]cF影响的研究  

A Study on Effect of Shot Peening on Corrsion Fatigue Crack Growth Rate [da/dN]_(CF) of Hydraulic Turbine Runner

作　　者：王蒲全[1] 崔广椿[2] 

机构地区：[1]西安高压电器研究所 [2]东北工学院

出　　处：《机械设计与制造》1992年第5期1-3,共3页Machinery Design & Manufacture

摘　　要：本文以水轮机转轮常用材料 ZG20SiMn 为对象,采用标准紧凑拉伸试样,研究喷丸与未喷丸试样的腐蚀疲劳裂纹扩展规律。结果表明,喷丸处理对腐蚀疲劳裂纹的应力循环初期,可显著降低[da/dN]_(cF),但随应力循环次数增加,残余应力逐渐消失,至一定程度对[da/dN]_(cF)无多大影响。分析了应力循环初期喷丸提高[da/dN]_(cF)抗力的原因。The steel ZG20SiMn has been studied with regard to the influ- ence of shot Peening on corrosion fatigue crack growth rate[da/dN]_(CF)by stand- arded CT specimen The experimental results show that during the initial time of cyclic stress number the[da/dN]_(CF) decreased evidently。With increasing cyclic stress number the effect of shot peenin9 on[da/dN]_(CF) may be remarkably decreased。 The above experimental results were discussed in this article.

关 键 词：水轮机 转轮 腐蚀 疲劳裂纹 

分 类 号：TK730.323[交通运输工程—轮机工程]