采掘机械用高强度无碳化物贝氏体钢齿座的研制与应用  

Development and Application of High Strength Carbide Free Bainite Steel Pick Seat for Mining Machinery

作　　者：程巨强[1] CHENG Juqiang(College of Materials Science and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《机械》2021年第6期14-19,共6页Machinery

摘　　要：为了提高大功率采掘机械用齿座截齿耐磨性和使用寿命,研制了一种新型无碳化物贝氏体钢齿座材料,进行了齿座渗碳热处理实验,测试了渗碳后齿座表面硬度及其渗碳层显微硬度的变化,观察了渗碳层的显微组织。结果表明,无碳化物贝氏体钢齿座渗碳后空冷低温回火表面可以获得较高的硬度,渗碳层外层硬度在58 HRC以上,心部硬度HRC 40,心部冲击韧性aKU 92 J/cm^(2)。渗碳后空冷低温回火齿座渗碳层最外层的组织为回火马氏体、残余奥氏体,过渡层的组织为回火马氏体、贝氏体铁素体、残余奥氏体,心部非渗碳层的组织为贝氏体铁素体和残余奥氏体组织。渗碳处理齿座的实体力学性能超过行业标准要求,应用于采掘机齿座具有良好的应用效果。To improve the wear resistance and service life of the pick seat for high-power mining machinery,a new carbide-free bainite steel pick seat material was developed,and the carburizing heat treatment experiment of the pick seat was carried out.The surface hardness of the tooth holder and the microhardness of the carburized layer after carburizing were tested,and the microstructure of the carburized layer was observed.The results showed that high hardness can be obtained on the carburized surface of carbide-free bainitic steel gear seat after air cooling and tempering at low temperature.The hardness of the carburized layer is above 58HRC,the hardness of the core is HRC40,and the impact toughness of the core is aKU 92 J/cm^(2).After carburizing,the microstructure of the outermost layer of carburized layer of air-cooled low-temperature tempered gear seat is tempered martensite and retained austenite,the microstructure of transition layer is tempered martensite,bainite ferrite and retained austenite,and the microstructure of the non-carburized layer in the center is bainite ferrite and retained austenite.The solid mechanical properties of carburized pick seats exceed the requirements of industry standards,and it has a good application effect when applied to mining machine pick seats.

关 键 词：无碳化物贝氏体钢 齿座 渗碳 组织 性能 

分 类 号：TD421[矿业工程—矿山机电]