锰对高铬铸铁凝固过程和组织的影响

研究了锰对高铬铸铁凝固过程和组织的影响。结果表明：锰降低液相线温度和共晶温度、缩小凝固温度范围；锰降低奥氏体珠光体转变温度，增加碳和铬等元素在奥氏体中的饱和溶解度，从而大大增加奥氏体的生；随锰量的增加，高铬铸铁态组织中残余奥氏体量增加，铸态硬度相应下降；但锰对高铬铸铁中的碳化物没有明显的影响。

Effect of Mn on Solidification Process and Microstructure of High Cr Cast Iron

Effect of manganese on solidification process and microstructure of high chromium cast iron is investigated. The results show that: manganese lowers liquidus and eutectic temperature, and narrows down the temperature range of solidification; manganese reduces the transformation temperature from austenite to perlite, and increases the saturation solubility of carbon and chromium in austenite, so remarkably enhances the stability of austenite; With the increase of manganese content, the retained austenite content in as-cast microstructure of cast iron rises and the hardness in as-cast lowers; But Manganese doesn't show obvious effect on carbide.