PCrNi3Mo钢真空渗铬层的组织与性能  

Microstructure and properties of vacuum chromized layer on PCrNi3Mo steel

作　　者：冯凌宵 金浩[1] 杨丽[1] Feng Lingxiao;Jin Hao;Yang Li(School of Equipment Engineering,Shenyang Ligong University,Shenyang Liaoning 110159,China)

机构地区：[1]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《金属热处理》2022年第8期168-172,共5页Heat Treatment of Metals

基　　金：辽宁省自然科学基金(2019-ZD-0264);辽宁省高等学校创新人才支持计划(LR2019060)。

摘　　要：在真空条件下对PCrNi3Mo钢表面进行渗铬处理,采用X射线衍射、扫描电镜、光学显微镜、自动显微硬度仪、干滑动摩擦及电化学腐蚀等手段分析了渗铬层的组织与性能。结果表明,PCrNi3Mo钢在真空渗铬处理后表面形成了一层由CrC、CrC和(Cr, Fe)C组成的化合物渗层,渗层致密且与基体结合良好。渗层深度、硬度、耐磨性以及耐腐蚀性均随渗铬保温时间的延长而提高。对工件进行12 h保温渗铬后得到的渗铬层厚度约为11μm,表面硬度为1117.1 HV0.5,磨擦因数最低,其磨损量为0.1225 mg,自腐蚀电流密度比基体降低了2个数量级,综合性能最优。Vacuum chromizing on the surface of PCrNi3 Mo steel was performed. The microstructure and properties of the chromized layer were analyzed by means of X-ray diffraction(XRD), scanning electron microscope(SEM), optical microscope, microhardness test, dry sliding friction and electrochemical corrosion test. The results show that the surface of the PCrNi3 Mo steel after vacuum chromizing forms a chemical compound coating of CrC, CrCand(Cr, Fe)C, and the chromized layer is dense and well bonded with the substrate. The depth, surface microhardness, wear resistance and electrochemical corrosion resistance of the chromized layer increase with the increase of chromizing time. When chromized for 12 h, the PCrNi3 Mo steel has the best comprehensive properties, of which the thickness of chromized layer is about 11 μm, the surface hardness is 1117.1 HV0.5, the friction coefficient is the lowest, the wear mass loss is 0.1225 mg and the self-corrosion current density is 2 orders of magnitude lower than that of the substrate.

关 键 词：PCrNi3Mo钢 真空渗铬 组织 性能 

分 类 号：TG174.445[金属学及工艺—金属表面处理]