真空环境下钢中裂纹的高温愈合  

STEEL CRACK HEALING AT ELEVATED TEMPERATURE IN VACUUM

作　　者：韦东滨[1] 韩静涛[1] 谢建新[1] 付晨光[1] 王连忠[1] 贺毓辛[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：《金属学报》2000年第7期713-717,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金重点资助项目!59889101;国家自然科学基金面上资助项目!59771068

摘　　要：以剖分试样真空处理法研究了钢内部裂纹的高温愈合行为，将含预置内部裂纹的 ２０ＭｎＭｏ钢及 ２０号和 ４５号钢试样剖分后封入真空度达 １３３×１０－４ Ｐａ的石英管高温处理 ４５ｍｉｎ．发现试样剖分面上的裂纹均出现愈合迹象，愈合区内呈现铁素体组织形态，与采用整体试样处理法所观察到的高温处理后内部裂纹愈合形态基本一致，这表明以剖分试样真空处理法研究钢内部裂纹愈合行为的可行性。The method of dissected sample heat treatment in vacuum was tried to study inner crack healing in steel at elevated temperature. The dissected samples with prepared inner crack were encapsulated in quartz glass tubes of 133×10-4 Pa, then were heat treated at elevated temperature. The cracks on section planes of 20MnMo, 20 and 45 steels were healed, and the ferrite appears in healing area. The results are similar as that of intact sample heat treatment, which indicates that the dissected sample heat treatment method is feasible for studying inner crack healing in steel. It was deduced that surface cracks of steel could be healed in vacuum environment at elevated temperature if it was not covered by oxide. The welding at elevated temperature is more effective for crack healing than other mechanisms during higher temperature.

关 键 词：钢 裂纹愈合 真空 高温愈合 

分 类 号：TG142.15[一般工业技术—材料科学与工程]