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齿轮广泛应用于机械制造业、汽车拖拉机制造业及航天工业中,对齿轮的材料选择及热处理工艺流程,应根据齿轮的服役条件及工作情况来决定。近年来,齿轮向高速发展,为了使中、高速的齿轮具有强大的载荷能力,常采用合金渗碳钢来制造。我们用18CrNiWA钢来制造齿轮。这种钢由于镍的作用,在渗碳层中很少出现粗大的碳化物,渗碳层中碳浓度分布平缓,经渗碳淬火、冰冷及回火处理后,表面具有高的硬度和耐磨性,心部则有很高的强度和韧性,故常用于制造高速度、高负荷的齿轮。图1所示的高速高强度齿轮就是采用这种钢制造的,热处理后要求硬度为HV694～774,抗拉强度б_b为
Gear is widely used in machinery manufacturing, automobile tractor manufacturing and aerospace industries, gear selection of materials and heat treatment process should be based on gear service conditions and work to decide. In recent years, the gear to the rapid development, in order to make high-speed gear with a strong load capacity, often made of alloy carburized steel. We use 18CrNiWA steel to make gears. Due to the nickel effect, this kind of steel rarely appears coarse carbides in the carburized layer. The carbon concentration distribution in the carburized layer is gentle. After carburizing, cooling and tempering, the surface has high hardness and wear resistance Sex, the heart is a high strength and toughness, it is often used to create high-speed, high-load gear. Figure 1 shows the high-speed high-strength gear is the use of such steel, heat treatment after the required hardness of HV694 ~ 774, tensile strength б_b