【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，压合效应要比单纯高温处理时的其它机制对钢中裂纹愈合的作用大更多还原

【Abstract】 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.更多还原