QPQ盐浴复合处理技术对3Cr2W8V钢组织和性能的影响

QPQ盐浴复合处理是一种新的金属盐浴表面强化改性技术,将QPQ技术应用干3Cr2W8V钢,利用OM、SEM、显微硬度计、X射线衍射仪、高温摩擦磨损试验机和电化学工作站分别对QPQ渗层的显微组织、化学成分、显微硬度,物相,耐磨性和耐蚀性进行了分析研究.结果表明,QPQ渗层表面平整,当盐浴氮碳共渗时间一定时,随着氮碳共渗盐...

Influence of QPQ salt bath composite processing on microstructure and property of 3Cr2W8V steel

QPQ salt bath composite process,which is a new modification technology of surface hardening of metal salt bath,was used to 3Cr2W8V steel,and with the help of OM,SEM,microhardness tester,X-ray diffraction,high-temperature friction and wear tester and electrochemical workstation,the microstructure,chemical composition,microhardness,phase,wear resistance and corrosion resistance of QPQ layer were analyzed.The results show that QPQ surface layer is flat,and when the salt bath nitrocarburizing time is certain,with the increasing of the nitrocarburizing salt bath temperature,the first appeared phase is Fe3N,followed by the emergence of Fe4N and Fe3O4 phases,and finally there is Fe2N phase.The surface microhardness of specimens treated by QPQ is 600～1400 HV0.1,and the matrix hardness is 520 HV0.1.The smallest wear loss of samples by QPQ treatment is half of that of matrix and the friction coefficient is the minimum,when the nitrocarburizing temperature is 580 ℃,and the nitrocarburizing time is 1 h.In the certain oxidation temperature of molten salt bath,the corrosion potential and the corrosion resistance increase gradually with the extended oxidation time.When the molten salt oxidation temperature is set to 380 ℃ and the oxidation time is 120 minutes,the corrosion potential of QPQ treated sample is the highest,and the corrosion resistance is the best.