武昌车辆厂试制与生产的 VC3—650型三角活塞转子发动机和一吨叉式车,该两产品中不少另件采用18CrMnTi、20Cr、40Cr、45、A3、NiCrMoCu 合金铸铁和 MoCuV 球铁等材料制成。要求提高表面硬度、耐磨性及疲劳强度等。过去采用渗碳淬火、高频淬火等工艺.有的另件因形状复杂,存在变形开裂及淬火不均匀等问题,影响产品质量。从1974年开始, Wuchang Vehicle Factory trial production and production of VC3-650-type triangular piston engine and a forklift forklift, the two products, many of the other pieces of 18CrMnTi, 20Cr, 40Cr, 45, A3, NiCrMoCu alloy cast iron and MoCuV ductile iron and other materials production. Requires increased surface hardness, wear resistance and fatigue strength. In the past the use of carburizing and quenching, high-frequency quenching and other processes, and some other parts because of the complex shape, there are deformation cracking and quenching uneven and other issues affecting product quality. Since 1974,