稀土渗氮对9Cr18Mo钢的QPQ盐浴复合处理性能的影响
Effect of rare earth nitriding on QPQ salt bath composite treatment performance of 9Cr18Mo steel
张鑫 1孟征兵 1周颖 1陈元钰 1李宇翔1
作者信息
- 1. 桂林理工大学材料科学与工程学院,广西桂林 541004
- 折叠
摘要
用自制渗氮基盐为渗氮剂和硝酸钾为氧化剂,碳酸镧、碳酸钇和碳酸铈为稀土催渗剂组成QPQ稀土渗氮剂,在610℃对9Cr18Mo钢进行QPQ盐浴复合处理,从而提高9Cr18Mo钢的各项性能.采用SEM、EDS、XRD、显微硬度测试、电化学性能测试和耐磨试验等测试手段,研究了稀土对9Cr18Mo钢组织和性能的影响.结果表明,QPQ盐浴复合处理试样的表面主要由氧化层、渗氮层和扩散层组成,主要组成物相为Fe4N、CrN、αN、Fe2-3N、Li2Fe3O4和Fe3O4,在QPQ盐浴复合处理中添加稀土比未添加稀土的显微硬度能平均提升90 HV0.2,耐蚀性和耐磨性也有所提高.
Abstract
In order to further improve the performance of 9Cr18Mo steel,the Quench-Polish-Quench(QPQ)rare earth nitriding agent was composed of self-made nitriding base salt as nitriding agent,potassium nitrate as oxidizing agent,lanthanum carbonate,yttrium carbonate and cerium carbonate as rare earth accelerator,and then the QPQ salt bath composite treatment was carried out for the 9Cr18Mo steel at 610 ℃.The effects of rare earth on the microstructure and properties of the 9Cr18Mo steel were studied by means of SEM,EDS,XRD,microhardness test,electrochemical performance test and wear resistance test.The results show that the surface of the QPQ salt bath composite treated specimen is mainly composed of oxide layer,nitriding layer and diffusion layer.The main component phases are Fe4N,CrN,αN,Fe2-3N,Li2Fe3O4 and Fe3O4.Compared with that without rare earth addition,the addition of rare earth on the QPQ salt bath composite treatment can increase the microhardness by 90 HV0.2 on average,and also improve the corrosion resistance and wear resistance.
关键词
9Cr18Mo钢/稀土渗氮/QPQ处理/耐蚀性/耐磨性/显微硬度Key words
9Crl8Mo steel/rare earth nitriding/QPQ treatment/corrosion resistance/wear resistance/microhardness引用本文复制引用
基金项目
广西壮族自治区科技重大专项(桂科AA22067079)
出版年
2024
NETL
NSTL
万方数据