热处理愈合不锈钢氢蚀裂纹实验研究  

HEALING OF HYDROGEN ATTACKED CRACK IN AUSTENITE STAINLESS STEEL BY HEAT TREATMENT

作　　者：李晓刚[1,2] 董超芳[1] 陈华[1] 褚武扬[1] 

机构地区：[1]北京科技大学材料科学与工程学院 [2]中国科学院金属研究所腐蚀与防护国家重点实验室,沈阳110016

出　　处：《金属学报》2001年第10期1093-1096,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金 59971011和 973"材料的环境行为与失效机理"课题资助项目

摘　　要：对含氢腐蚀甲烷气泡和裂纹的３０４不锈钢进行了６００℃ ，６ｈ的再热处理. ＳＥＭ观察表明，氢蚀气泡和裂纹发生了完全愈合．氢蚀气泡和裂纹的愈合机制是热扩散，Ｆｅ和 Ｃ在奥氏体中的快速扩散是 ３０４不锈钢中氢蚀裂纹的自愈合的必要条件．发生氢蚀裂纹愈合的动力是氢蚀气泡长大导致的塑性变形能Ｅｓ，在Ｆｅ，Ｃ和Ｈ原子扩散都足够快的情况下，氢蚀气泡和裂纹的愈合条件是 Ｅｓ≥ ２γ／ｒ（γ为界面表面张力，ｒ为气泡半径或裂纹半长）．氢蚀气泡或裂纹的愈合过程伴随亚晶长大、多边形化的高温回复过程甚至再结晶.The specimens of 304 austenite stainless steel with the hydrogen attacked bubbles or cracks were heat treated under 600 degreesC for 6 h. The SEM and TEM observations on the specimens before and after the heat treatment show that the bubbles or cracks can be healed completely by heat treatment. The healing of hydrogen attacked bubbles or cracks is closely related to heat diffusion of Fe and C atoms in austenite. The driving force of crack healing results from the plastic deforming energy E-s induced by the growth of hydrogen attacked bubbles or cracks. The critical condition of healing of bubbles or cracks is E-s greater than or equal to 2gamma/r (where gamma is the surface tension, r is the radius of bubbles or half length of crack). During healing of the hydrogen attacked bubbles or cracks, the recovery, polygonization and recrystallization of the sub-grain were also taken place.

关 键 词：不锈钢 氢蚀 裂纹 愈合 热处理 

分 类 号：TG161[金属学及工艺—热处理] TG142.71[金属学及工艺—金属学]