采用自制平面应力拉伸装置，通过扫描电镜，透射电子显微镜等分析测试方法对15CrMnMoV钢的淬火回火组织和淬火冷轧组织的断裂行为进行了研究。实验结果表明：具有冷轧组织试样的断裂阻力明显高于原始组织试样。利用复型的方法精确测定出裂纹长度，并计算得出能量释放率D△a的关系曲线，轧制试样在△a=40 μm时出现峰值，显微组织分析表明峰值产生的原因是弱界面开裂的结果。
Planar stress tensile equipment made by myself is applied. The crack propagation of tempered and coldrolled microstructure of 15CrMnMoV steel is studied by SEM and TEM etc. The results show: the crack resistance of the coldrolled specimens is higher than that of the original specimens. The crack lengths are measured accurately by complex method, and the relationships of D△a are plotted. The peak appear at the curve of the coldrolled (△a=40 μm) due to fracture of weak interface.
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