塑性区对Inconel 690合金腐蚀疲劳裂纹扩展行为的影响  

Effect of plastic zone on corrosion fatigue crack propagation behavior of Inconel 690 alloy

作　　者：付正鸿[1,2] 刘锦云[1] 查五生[1] 肖军[2] 邱绍宇[2] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039 [2]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610041

出　　处：《金属热处理》2016年第3期138-141,共4页Heat Treatment of Metals

基　　金：中国核动力研究设计院探索基金(JJXM-TSQZ-11-11-01)

摘　　要：通过在室温空气及325℃饱和氧高纯水中进行疲劳裂纹扩展试验,研究单向塑性区大小rp对Inconel 690合金疲劳裂纹扩展行为的影响。结果表明,同一频率下,随着rp的增加,裂纹扩展速率CGR加快,但环境影响因子Fen未发生明显变化;裂纹为穿晶型扩展,扩展过程中伴随着少量分支,载荷的变化对支裂纹数量没有明显的影响;断口为典型的腐蚀疲劳特征,裂纹扩展形成韧性断裂特征的山脊区和脆性疲劳断裂的疲劳平台。Effect of plastic zone range（ r_p） on fatigue crack growth behavior of Inconel 690 alloy was investigated by fatigue crack growth experiment in room temperature and 325 ℃ in saturated dissolved oxygen high purity water. The results show that at same frequency,with rp increasing,the CGR is accelerating while environmental impact factor Fenhas no obvious exchange. The crack growth path is transgranular with a little of breaches,the fracture has obvious corrosion fatigue feature,ridge area with ductile fracture characteristics and fatigue platform with brittle fatigue fracture characteristics can be observed.

关 键 词：INCONEL 690合金 单向塑性区 高纯水 腐蚀疲劳 

分 类 号：TG171[金属学及工艺—金属表面处理]