为了提高35CrMoA的力学性能,对形状简单的零件可以采用提高加热温度,盐水淬火的非常规的热处理方式。但钢中Mo含量较低时,对零件淬火后的力学性能影响很大。采用直读光谱分析、断口宏观形貌分析、力学性能测试、低倍组织分析、扫描电镜分析、金相显微组织分析等手段,研究了35CrMoA钢零件脆性断裂原因。 In order to improve the mechanical properties of 35CrMoA, the simple shape of the parts can be used to increase the heating temperature, brine quenching unconventional heat treatment. However, when the content of Mo in steel is low, the mechanical properties of parts after quenching are greatly affected. The cause of brittle fracture of 35CrMoA steel was studied by means of direct reading spectroscopy, macroscopic analysis of fracture surface, mechanical property test, low magnification microstructure analysis, scanning electron microscopy analysis and metallographic microstructure analysis.