Healing of hydrogen-attacked cracks in split specimens with recovering heat treatment in vacuum  

作　　者：JingXu ChaofangDong XiaogangLi 

机构地区：[1]DepartmentofMaterialPhysics,UniversityofScienceandTechnologyBeijing,Beijing100083,China [2]StateKeyLaboratoryofCorrosionandProtection,Shenyang110016,China

出　　处：《Journal of University of Science and Technology Beijing》2004年第3期245-250,共6页北京科技大学学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No.59971011) and "973" Science Foundation of China (No. 19990650).

摘　　要：The healing mechanism of hydrogen-attacked cracks in low carbon steel andCr-Mo steel and its influencing factors during the healing process were studied by recovering heattreatment of split specimens in vacuum. The result showed that crack pacing turns much smaller underthe condition of pure heating, especially for crack tips. The healing effect is well related to thelength of cracks with the shorter in priority. By the primary mechanism of thermal diffusion, ironand carbon atoms must diffuse at the high speed in steel to realize that plasticity deformationenergy exceeds and overcomes surface tensile force energy. In addition, phase transformation andstress-stain relationship also have positive effects on the process.The healing mechanism of hydrogen-attacked cracks in low carbon steel andCr-Mo steel and its influencing factors during the healing process were studied by recovering heattreatment of split specimens in vacuum. The result showed that crack pacing turns much smaller underthe condition of pure heating, especially for crack tips. The healing effect is well related to thelength of cracks with the shorter in priority. By the primary mechanism of thermal diffusion, ironand carbon atoms must diffuse at the high speed in steel to realize that plasticity deformationenergy exceeds and overcomes surface tensile force energy. In addition, phase transformation andstress-stain relationship also have positive effects on the process.

关 键 词：hydrogen-attack crack HEALING heat treatment 

分 类 号：TG156.9[金属学及工艺—热处理]