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一、引言气相渗碳过程是让铁部件在高温下暴露于含碳的气体混合物中,使碳通过扩散和渗透进入部件的表面或内层。目的在于增加部件表面的碳含量,从而提高它的表面强度和耐疲劳强度等。对于一种特定的钢种来说,在其表面层上下所需的碳的浓度剖面是借部件上方的气体中的碳位(potential)以及渗碳操作的温度和时间来控制的。在渗碳处理时、常采用复杂的循环过程,包括仔细地改变温度和气体的组成等,最后使部件表面层达到所需
I. INTRODUCTION Vapor carburization is the process of exposing iron parts to carbon-containing gas mixtures at high temperatures, allowing carbon to diffuse and penetrate into the surface or inner part of the part. The purpose is to increase the surface carbon content of parts, thereby enhancing its surface strength and fatigue resistance and so on. For a given steel grade, the desired carbon concentration profile above and below the surface layer is controlled by the potential in the gas above the component and the temperature and time of the carburizing operation. In the carburizing process, often using a complex cycle of processes, including careful changes in temperature and gas composition, and finally make the surface layer of the desired parts