PCrNi3Mo钢真空渗铬层的组织与性能

doi:10.13251/j.issn.0254-6051.2022.08.028

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 168-172.DOI: 10.13251/j.issn.0254-6051.2022.08.028

PCrNi3Mo钢真空渗铬层的组织与性能

冯凌宵, 金浩, 杨丽

沈阳理工大学装备工程学院, 辽宁沈阳 110159

收稿日期:2022-03-16 修回日期:2022-06-17 出版日期:2022-08-25 发布日期:2022-09-19
通讯作者: 金浩,教授级高级实验师,博士,E-mail:104310@163.com
作者简介:冯凌宵(1994—),女,硕士,主要研究方向为材料表面强化技术,E-mail:2217577817@qq.com。
基金资助:
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)

Microstructure and properties of vacuum chromized layer on PCrNi3Mo steel

Feng Lingxiao, Jin Hao, Yang Li

School of Equipment Engineering, Shenyang Ligong University, Shenyang Liaoning 110159, China

Received:2022-03-16 Revised:2022-06-17 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

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Cr₂₃C₆、Cr₇C₃和(Cr,Fe)₇C₃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11 μm,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。

关键词: PCrNi3Mo钢, 真空渗铬, 组织, 性能

Abstract: Vacuum chromizing on the surface of PCrNi3Mo 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 PCrNi3Mo steel after vacuum chromizing forms a chemical compound coating of Cr₂₃C₆, Cr₇C₃ and (Cr, Fe)₇C₃, 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 PCrNi3Mo 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.

Key words: PCrNi3Mo steel, vacuum chromizing, microstructure, properties

中图分类号:

TG174.445

冯凌宵, 金浩, 杨丽. PCrNi3Mo钢真空渗铬层的组织与性能[J]. 金属热处理, 2022, 47(8): 168-172.

Feng Lingxiao, Jin Hao, Yang Li. Microstructure and properties of vacuum chromized layer on PCrNi3Mo steel[J]. Heat Treatment of Metals, 2022, 47(8): 168-172.

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PCrNi3Mo钢真空渗铬层的组织与性能

Microstructure and properties of vacuum chromized layer on PCrNi3Mo steel

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