残余奥氏体对20Mn2SiVB钢的疲劳裂纹扩展的影响  

Influence of Retained Austenite on Fatigue Crack Propagation of 20Mn2SiVB Steel

作　　者：吴化[1] 闫肃[1] 曹正[2] 

机构地区：[1]长春工业大学材料科学与工程学院,吉林长春130012 [2]中国第一汽车集团公司技术中心,吉林长春130011

出　　处：《热加工工艺》2006年第4期20-22,共3页Hot Working Technology

基　　金：吉林省科技厅高新技术新产品开发项目(20020328)

摘　　要：研究了残余奥氏体对20Mn2SiVB钢疲劳裂纹扩展的影响。结果表明,在贝氏体铁索体中有残余奥氏体膜的存在,残余奥氏体膜可起到提高断裂韧性的作用;在应力强度因子较高的范围内,疲劳裂纹扩展速率受钢的断裂韧性影响,断裂韧性高,裂纹扩展速率低。The influence of retained austenite on fatigue crack propagation in 20Mn2SiVB was investigated. The results show that there are retained austenite films in bainitic steel. The fracture toughness is increased by the retained austenite films＇ effect. In the higher AK range, the fatigue crack propagation rate will be affected by the fracture toughness in steel. The higher fracture toughness in steel is helpful for decreasing the fatigue crack propagation rate.

关 键 词：贝氏体钢 残余奥氏体 裂纹扩展速率 断裂韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]