热处理作用下碳钢氢腐蚀裂纹愈合规律  

Crack Healing of Hydrogen Attack in Carbon Steel by Heat Treatment

作　　者：董超芳[1] 李晓刚[1] 沈卓身[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,北京100083

出　　处：《北京科技大学学报》2001年第4期352-356,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.59971011);973项目"材料的环境行为与失效机理"的支持

摘　　要：对含氢腐蚀裂纹的碳钢进行再热处理后，ＳＥＭ观察表明，氢蚀裂纹发生了不同程度 的愈合．实验结果表明：长度约为１０μｍ的碳钢氢蚀裂纹完全愈合的热处理条件是从室温到 １０００℃热循环 ５次，共 １０ｈ．氢蚀裂纹的愈合机制是热扩散，发生氢蚀裂纹愈合的动力是氢蚀 气泡或裂纹长大导致的塑性变形能Ｅｓ．在铁、碳和氢原子扩散都足够快的情况下，氢蚀裂纹愈 合的条件是Ｅｓ大于裂纹愈合所必须克服的表面张力能．The experiment is aimed at obtaining the result of Crack healing of hydrogen attack (HA) in carbon steel. The recovery method used is heat treatment. Through SEM, it is Observed that HA cracks have gotten different healing effects. The results indicate that the HA CraCks with 10um length can be healed completely by five-times circle heat treatment between normal temperature and 1000 for 10h. The studies show that cracks healing are controlled by heat diffusion and the recovery kinetics is source from the plastic deforming energy Es, which is formed during the growth of HA bubbles or cracks. These findings of the research have led to the conclusion that the critical condition of healing bubbles or cracks is the Plastic deforming energy Es mere than the surface tension force of HA bubbles or cracks if the atoms of H, C, Fe can diffused rapidly.

关 键 词：氢腐蚀 裂纹愈合 碳钢 热处理 

分 类 号：TG161[金属学及工艺—热处理] TG172.82[金属学及工艺—金属学]