许多常用的工程结构零件,尽管仅在某一特殊表面区域要求具有较高硬度,但依然往往采用穿透硬化或整个零件表面硬化。近年来,为了节约能源、改善零件的性能、缩短生产的周期等,已经对有选择地使零件表面小范围硬化的技术有了足够的重视。在这 Many commonly used engineering structural parts, although only in a special surface area requires a higher hardness, but still often through the hardening or the entire surface hardening. In recent years, in order to save energy, improve the performance of parts, shorten the production cycle, etc., has been given to selectively small parts of the surface hardening technology has given sufficient attention. At this