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在HIGH－MULTI5000型热压机上对含有人工预置内部裂纹的20MnMo钢及20号钢试样进行了愈合实验，发现热塑性变形条件下，存在于预置内部裂纹区域的裂纹缝隙消失，裂纹完全愈合，愈合区内为铁素体，与无塑性变形、仅经过高温处理的试样内部裂纹形态进行对比，表明热塑性变形条件下愈合进程大大加快，但愈合区与基体组织形态不一致的状况并未改善
The healing experiments of 20MnMo steel and 20 steel with manual preset internal cracks on HIGH-MULTI5000 hot press were found. Under the conditions of thermoplastic deformation, the cracks in the pre-set internal cracks disappeared and the cracks completely healed , And the healing area is ferrite, which is compared with the internal crack shape of the sample without plastic deformation and only high temperature treatment, which shows that the healing process is greatly accelerated under the condition of the thermoplastic deformation, but the inconsistency between the healing area and the matrix structure does not improve