采用热压愈合的实验方法，对碳钢氢腐蚀裂纹的愈合行为进行研究.结果表明，在热塑性变形条件下，经1000℃、压下率为40%、15 min短时间处理，能够基本消除碳钢试样内的氢蚀裂纹，局部未修复裂纹呈现为尺寸4 μm～8 μm的透镜状.与单纯高温愈合处理(1000℃循环热处理10 h)的实验结果相比，塑性形变可大大缩短裂纹愈合所需要的热处理时间。热塑性变形下的裂纹愈合进程及程度加大，且氢蚀裂纹内高压甲烷气体的分解不是裂纹愈合过程的控速步骤.
Healing of hydrogen-attacked (HA) cracks in carbon steel was studied by using hot press treatment.Under hot plastic deforming at 1000°C and the deformation rate of 40%,the most of HA cracks can be recovered completely within 15 min.Partial HA cracks,which has not been recovered by hot-press treatment,present the spherical cap-shaped with the length of about 4 μm～8 μm.Comparing with the results of high temperature treatment without press (cyclic heat treatment between room temperature and 1000 ℃ for 10 h),both the healing degree and speed under hot plastic deforming are improved obviously.There are not distinct difference of healing results between the direct hot-press healing and pre-heated treatment before hot-press healing.That means the decomposition of methane in HA cracks is not the key step during the whole healing process.
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