20CrMnTi真空脉冲感应渗碳及耐磨性研究

Study on 20CrMnTi vacuum pulse induced carburizing and wear resistance

利用真空脉冲渗碳技术和真空感应渗碳技术对20CrMnTi钢进行表面强化,通过X射线衍射、扫描电镜、显微硬度测试等技术手段,探究不同压力下,2种工艺对表面渗层微观组织结构、硬度梯度以及耐磨性的影响规律。结果表明:相同渗碳压力下,真空感应渗碳表面硬度高于对应的真空脉冲渗碳工艺的表面硬度值,渗层厚度、耐磨性能也都优于对应的真空脉冲渗碳工艺,当渗碳压力为-70kPa时,真空脉冲渗碳工艺的磨损速率达到8. 34×10^(-7)cm^3/min·N,真空感应渗碳的磨损速率为6. 27×10^(-7)cm^3/min·N,摩擦性能最好。

The surface of 20CrMnTi steel was strengthened by vacuum pulse carburizing technology and vacuum induction carburizing technology,respectively.Using X-ray diffraction,optical microscope,scanning electron microscope,microhardness tester,etc.To explore the influence law of two processes of microstructure,hardness gradient and wear resistance of surface infiltrated layer under different pressures.The results show that the surface hardness values of vacuum induction carburizing are higher than those of corresponding vacuum pulse carburizing process under the same carburizing pressure.The thickness and wear resistance of carburized layer are also better than those of corresponding vacuum pulse carburizing process.When the carburizing pressure is-70 kPa,the friction performance is the best.The wear rate of the vacuum pulse carburizing process is 8.34×10^-7 cm^3/min·N,and the wear rate of the vacuum induction carburizing is 6.27×10^-7 cm^3/min·N.