利用电子探针和 X 光衍射技术,研究了40Cr 钢经不同保温时间淬火后显微组织中,碳及合金元素的含量、残余奥氏体量及表层残余应力。回火后进行拉伸、一次冲击、多次冲击、残余应力等试验。文中阐述了缩短淬火保温时间与组织和性能之间的关系,并以材料强度观点论证了奥氏体非均匀化淬火的可行性。在生产中收到了节能、提高生产效率的经济效益。 The content of carbon and alloying elements, residual austenite and surface residual stress in 40Cr steel after quenching with different holding time were studied by electron probe and X-ray diffraction. Tempering after stretching, a shock, repeated impact, residual stress and other tests. The paper expounds the relationship between shortening quenching holding time and microstructure and properties, and demonstrates the feasibility of heterogeneous quenching of austenite from the viewpoint of material strength. Received in the production of energy-saving and improve the economic efficiency of production efficiency.