一、前言 目前工厂在对某些零件进行气体渗碳时,如果工艺控制不当,在渗层内常常出现网状碳化物,严重时使渗层变脆,接触疲劳强度降低,导致表层剥落,影响到零件的使用寿命。为了消除这一缺陷,在工艺上往往增加正火工序,但同时带来了零件的变形和脱碳,降低了零件的质量。 I. Preface At present, when the factory carburizing gas for certain parts, if the process is improperly controlled, mesh carbides often appear in the infiltrated layer. In severe cases, the infiltrated layer becomes brittle and the contact fatigue strength decreases, causing the surface to peel off, which affects To the life of the parts. In order to eliminate this defect, the process is often increased normalizing process, but at the same time brought the deformation and decarburization parts, reducing the quality of parts.