准贝氏体钢渗碳特性及磨损性能研究

Study of Carburized Characteristic and Wear Behavior in Meta-Bainitic Steel

研究了准贝氏体钢渗碳特性及渗层磨损性能。结果表明，准贝氏体钢渗碳后空冷，渗碳最外层为高碳马氏体和残留奥氏体组织，无碳化物及石墨相析出；心部为准贝氏体组织，渗层碳浓度及浓度梯度平缓，显示出准贝氏体良好的渗碳特性。磨损试验表明，渗碳后不同温度回火，准贝氏体钢渗层耐磨性接近和超过１８Ｃｒ２Ｎｉ４ＷＡ渗碳钢水平，二体磨料磨损机制以微切削机制为主，三体磨料磨损以应变疲劳为主。准贝氏体钢可作为渗碳钢代替含较高Ｃｒ、Ｎｉ的合金渗碳用钢。

In this paper, carburized characteristic and wear behaviour of carburized layer are studied. Experimantal result shows that microstructure of non carburized layer is meta-bainite, the microstructure of autside area in carburized layer is high carbon martensite and retained austenite, after meta-bainitic steel is carburized and air-cooled. The wear testing shows that the wear resistance of carburized layer of meta-bainitic steel reachs or excecds that of 18Cr2Ni4WA steel. The wear mechanism of dish obrasive wear is mainly microcut. The wear mechanism of impact abrasive wear is mainly strain controlled. Metabainitic steel can be used as carburized steel, and it can replace the carburizing steel with high alloy element, high properties and nickel element. 