利用高频电阻感应加热自冷淬火方法对４５、４０Ｃｒ和３５ＣｒＮｉ３Ｍｏ钢进行了实验，获得了仿形性淬火带，硬度可达ＨＲＣ５４～５９。金相检验和透射电镜观察，淬硬带主要是回火板条马氏体，４０Ｃｒ钢个别区域有片状马氏体，４５钢有少量的下贝氏体，试件淬火后基本不变形，也无需回火。 Experiments were carried out on 45, 40Cr and 35CrNi3Mo steels by self-cooled quenching method with high-frequency resistive induction heating, and the conformal quenching zone was obtained with HRC54-59. Metallographic examination and transmission electron microscopy, hardened with tempered lath martensite, 40Cr steel sheet martensite in individual areas, a small amount of 45 steel bainite, the specimen after the basic deformation is not quenched, Also do not need to temper.