20CrMnMo钢稀土渗碳研究

Study on RE Carburizing of 20CrMnMo Steel

采用稀土渗碳工艺对20CrMnMo钢进行渗碳处理,研究了渗层增厚的动力学、渗碳层组织和性能。结果表明:稀土渗碳层中沉淀析出了大量弥散分布的粒状碳化物,淬火后表层组织为针状马氏体、大量细小颗粒碳化物、少量残余奥氏体。渗碳层的硬度与传统工艺相比提高了10%,耐磨性提高了32%,接触疲劳寿命也有大幅提高。

RE carburization was carried out on 20CrMnMo steel.The carburizing kinetics of carburizing depth was dealed with,the microstructure of the carburized layer was observed,the hardness and abrasion resistance of the carburized layer were examined.The results show that a large amount of dispersed granular carbides precipitated in the carburized layer of 20CrMnMo steel RE carburized.The microstructure of surface layer after directly quenching consists of acicular martensite,fine granular carbides and a little residual austenite.The test results showed 10 persent improvement in hardness,32 persent improvement in abrasion resistance,The touching fatigue life is sharply improved too.