摘要
20Cr2Ni4钢是一种高Cr、Ni渗碳合金钢,具有良好的淬透性、硬度和心部韧性。采用“渗碳+高温回火+二次加热淬火+低温回火”及“渗碳+直接淬火+冷处理+低温回火”两种工艺对20Cr2Ni4钢进行热处理,并从显微组织、渗层硬度梯度、表面及心部硬度、耐磨性与冲击性能等方面进行对比。结果表明:“渗碳+高温回火+二次加热淬火+低温回火”处理后的试样渗碳效果、表面硬度更好,“渗碳+直接淬火+冷处理+低温回火”处理后的试样则减少了淬火变形与表层氧化脱碳。
20Cr2Ni4 steel is a high Cr,Ni carburizing alloy steel with good hardenability,hardness and core toughness.Two processes of“carburizing+high temperature tempering+secondary heating quenching+low temperature tempering”and“carburizing+direct quenching+cold treatment+low temperature tempering”were used to heat treat 20Cr2Ni4 steel,and the microstructure,hardness,wear resistance and impact toughness were compared.The results show that the carburizing effect and surface hardness of the samples treated by the secondary heating and quenching process are better,while the samples treated by the direct quenching process reduce the quenching deformation and surface oxidation and decarburization,save energy and reduce emissions,and improve the production efficiency.
作者
何业增
马成飞
李云鹏
王倩
宋庆雷
刘友军
沈承金
HE Yezeng;MA Chengfei;LI Yunpeng;WANG Qian;SONG Qinglei;LIU Youjun;SHEN Chengjin(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Xuzhou But Engineering Machinery Co.,Ltd.,Xuzhou 221004,Jiangsu,China)
