采用模拟焊接热影响区粗晶区应力释放的试验方法，研究ＣＦ６２钢在焊后热处理过程中的消除应力裂纹敏感性及其形成机理．结果表明：ＣＦ６２钢焊接热影响区粗晶区具有消除应力裂纹敏感性，并随焊后热处理加热温度的升高而增大．消除应力裂纹敏感性取决于焊后热处理过程中材料所承受的塑性变形量和其进行塑性变形、蠕变变形的能力．粗大晶粒和高残余拉伸应力的存在是产生消除应力裂纹的必要条件． The test method of simulating the stress release in the coarse-grained zone of heat-affected zone (HAZ) was used to study the stress-crack-susceptibility and formation mechanism of CF62 steel during post-weld heat treatment. The results show that the coarse grain zone of heat-affected zone of CF62 steel has the stress sensitivity to stress cracking and increases with the increase of heating temperature after welding. The susceptibility to stress cracking depends on the amount of plastic deformation the material undergoes during the post-weld heat treatment and its ability to undergo plastic deformation and creep deformation. The presence of coarse grains and high residual tensile stress is a necessary condition for the elimination of stress cracks.