目前,在国外渗碳层深度大有减少的趋势。汽车齿轮零件的渗碳层按其模数的20%确定时,发现渗碳层过深,表面层形成残余拉应力,使疲劳强度降低。通过对残余应力的测定认为,目前所采用的渗层可以减少30%,相应可节能30%。有关资料介绍,美国已将一些汽车齿轮渗碳层由1.1～1.4mm降到1.0mm。至于轻型零件的渗碳,基本上 At present, the depth of carburizing in foreign countries greatly reduces the trend. Car parts of the carburizing layer according to its modulus of 20% to determine, it was found carburized layer is too deep, the surface layer of residual tensile stress, the fatigue strength decreased. According to the measurement of residual stress, the existing infiltration layer can be reduced by 30%, correspondingly saving 30%. Relevant information, the United States has some car gear carburized layer from 1.1 ~ 1.4mm down to 1.0mm. As for the carburizing of light parts, basically