中文摘要：

对经过热愈合处理的16Mn钻孔压缩试样的内裂纹愈合形态、愈合区域组织结构、显微硬度进行了测试与分析．扫描电镜分析结果显示，愈合区内精细组织主要为铁索体，并存在许多大小为几百纳米级的多边晶块．维氏硬度测试结果显示，出现在愈合区铁素体组织的维氏硬度高于基体区铁索体组织，其可能原因是愈合区中出现的多边晶块结构所引发的强化。

英文摘要：

Healing processing of 16Mn steel samples was carried out. The healing area of internal cracks made by compressing a drilled hole was observed and analyzed. SEM analysis displayed that the fine structure in the healing area is mostly ferrite and there exists many polyangular grains of several hundreds nanometer. Vickers hardness tests showed that the hardness of ferrite in the healing area is higher than that in the matrix, which may result from strengthening of polyangular grains.