前言长期以来,人们通过氨气分解进行气体氮化,改善铸铁的耐磨性和疲劳强度。但是,这种处理需要使甩精细石墨含量尽可能少的铸铁,并加入优先吸氮的元素(主要是铬、铝、钼)以形成氮化物并使扩散层硬化。采用离子氮化或盐浴氮化,可使用无合金元素的铸铁,经处理后,通过生成化合层,获得机械性能。人们指出,采 Foreword For a long time, gas nitriding has been carried out by ammonia decomposition to improve the wear resistance and fatigue strength of cast iron. However, this treatment requires the use of cast iron with a fine graphite content as small as possible, and the addition of preferentially nitrogen-absorbing elements (mainly chromium, aluminum, molybdenum) to form nitrides and harden the diffusion layer. Ion nitriding or salt bath nitriding can be used without alloying elements of cast iron, after treatment, through the formation of composite layer to obtain mechanical properties. People point out that mining