QPQ技术中渗氮时间对合金铸铁组织及摩擦性能的影响  

Influence of nitriding time in QPQ technology on microstructure and friction properties of alloy cast iron

作　　者：王钦娟[1] 林少阳 陈忠士[1] 刘东[3] Wang Qinjuan;Lin Shaoyang;Chen Zhongshi;Liu Dong(School of Mechanical and Intelligent Manufacturing,Fujian Chuanzheng Communications College,Fuzhou Fujian 350007,China;Fujian Sansteel Metallurgical Construction Co.,Ltd.,Sanming Fujian 365000,China;School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou Fujian 350116,China)

机构地区：[1]福建船政交通职业学院机械与智能制造学院,福建福州350007 [2]福建三钢冶金建设有限公司,福建三明365000 [3]福州大学机械工程及自动化学院,福建福州350116

出　　处：《金属热处理》2021年第10期226-231,共6页Heat Treatment of Metals

基　　金：2020年福建省中青年教师教育科研项目(JAT201073);福州市科技计划(2018-G-68)。

摘　　要：采用OM、SEM、硬度测试、摩擦磨损试验等方法研究了QPQ技术中渗氮时间对合金铸铁组织与摩擦性能的影响。结果表明,QPQ处理后,合金铸铁表面形成的渗层物相主要由Fe_(2-3) N、Fe_(2)O_(3)和FeO组成。渗层厚度的平方与渗氮时间存在线性关系,在580℃渗氮盐浴条件下,氮元素在合金铸铁中的扩散激活能为70.07 kJ/mol。在90~150 min渗氮时间内,随着渗氮时间延长,渗层的表面硬度值由522 HV0.05降低至441 HV0.05,当渗氮时间延长至180 min,表面硬度值回升至455 HV0.05。与未处理试样相比,QPQ处理的试样具有更小的摩擦因数,并且QPQ处理后试样表面的犁沟显著变浅,表面的金属剥落也得到明显改善,且随着渗氮时间的增加,渗层厚度增加且稳定材料。经180 min渗氮处理的QPQ试样具有最优综合性能,表面硬度值为455 HV0.05,摩擦因数为0.32。Influence of nitriding time in QPQ technology on the microstructure and friction properties of an alloy cast iron was studied by means of OM,SEM,hardness test,friction and wear test methods.The results show that after QPQ treatment,the nitriding layer formed on the surface of the alloy cast iron is mainly composed of Fe_(2-3) N,Fe_(2)O_(3) and FeO.There is a linear relationship between the square of the nitriding layer thickness and the nitriding time.Under the condition of nitriding salt bath at 580℃,the activation energy of nitrogen diffusion in the alloy cast iron is 70.07 kJ/mol.Within the nitriding time range of 90-150 min,with the increase of the nitriding time,the surface hardness value of the nitriding layer decreases from 522 HV0.05 to 441 HV0.05,while when the nitriding time is extended to 180 min,the surface hardness value rises back to 455 HV0.05.Compared with the untreated specimen,the QPQ-treated specimen has a smaller friction coefficient,and after the QPQ treatment,the furrows on the surface of the specimen become significantly shallower,the metal peeling at the surface is also significantly improved.As the nitriding time increases,the thickness of the nitriding layer increases and the material is stabilized.The QPQ specimen after 180 min nitriding has the best comprehensive properties,with surface hardness value of 455 HV0.05 and friction coefficient of 0.32.

关 键 词：QPQ技术 渗氮时间 合金铸铁 组织 摩擦磨损 

分 类 号：TG156.8[金属学及工艺—热处理]