16Mng钢短裂纹腐蚀低频疲劳的断裂力学特性  

THE CHARACTERISTICS OF FRACTURE MECHANICS OF SHORT-CRACK AND LOW-FREQUENCY FATIGUE IN 16Mng STEEL

作　　者：钟曼英[1] 徐坚[1] 张明[1] 程云鹏 

机构地区：[1]中国计量学院,杭州310034

出　　处：《腐蚀与防护》1997年第3期29-31,共3页Corrosion & Protection

摘　　要：应用弹塑性断裂力学和△Ｊ参数，研究了１６Ｍｎｇ钢短裂纹的纯机械疲劳和氢蚀疲劳特性。并用ｄａ／ｄＮ＝Ｃ（△Ｊ）＾ｎ计算了裂纹的扩展速度和门槛值。用金相法考察了裂纹扩展途径。结果表明，氢的渗入降低了裂纹扩展的门槛值，加速了裂纹的扩展速度。The characteristics of mechanical fatigue and corrosion fatigue of short-crack in 16Mng steel have been investigated employing elastic-plastic fracture mechanics. The crack propagation rate and threshold val-ue are calculated using da/dN = C(△J)n. The results showed that:in air: (da/dN) 1 =5. 48×1027(△J)12m/c/gd; (da/dN)1, = 1. 06× 10-5(△J)0.67m/c;△Jth=716×10-6mN/m hydrogen charged: (da/dN)= 4.13×1028(△J)11.17m/c; (da/dN)1 =4×10-6(△J)0.20);△Jth=394×10-6mN/m and the crack was transgranular. The hydrogen increased the fracture Sensitivity of 16Mng steel.

关 键 词：钢 裂纹 氢腐蚀 疲劳 断裂力学 

分 类 号：TG174.34[金属学及工艺—金属表面处理]