引用本文:胡建军,赵雪,郭宁,杨显,李晖,许洪斌.40Cr钢表面包埋渗Mo涂层组织及摩擦性能∗[J].中国表面工程,2021,34(1):60~69
Hu Jianjun,Zhao Xue,Guo Ning,Yang Xian,Li Hui,Xu Hongbin.Microstructure and Tribological Properties of Mo-coating Prepared by Pack-cementation on 40Cr Steel[J].China Surface Engineering,2021,34(1):60~69
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40Cr钢表面包埋渗Mo涂层组织及摩擦性能∗
胡建军1,2, 赵雪1, 郭宁3, 杨显1, 李晖1, 许洪斌2
1.重庆理工大学材料科学与工程学院 重庆 400054;2.重庆市模具技术重点实验室 重庆 400054;3.西南大学材料与能源学院 重庆 400715
摘要:
热扩散渗钼(Mo)是钢材表面化学成分的改性方式之一,其可提高钢的淬透性,与碳作用形成高熔点的碳化物,能够提高钢铁材料表面的耐磨性。 为探索热扩散渗钼工艺,分别采用箱式炉加热和感应加热对 40Cr 钢进行 1 000 ~ 1 300 ℃ 不同温度下包埋扩散渗处理,利用场发射扫描电子显微镜(FEG-SEM)、X 射线衍射技术(XRD)和摩擦磨损试验研究了渗 Mo 试样的微观组织、元素分布、物相构成以及摩擦磨损性能,并对感应加热渗 Mo 微观结构的演变机理进行了阐述。 结果表明:在 1 100 ℃下箱式炉加热未观察到明显的 Mo 渗层,而感应加热在不同温度下形成了 30 ~ 70 μm 厚的 Mo 渗层;感应加热后试样截面组织由 Mo 渗层、过渡层、受影响层、基体组成,其中 Mo 渗层主要由 Fe-Mo 固溶体(Fe-Mo SS)和碳化物相组成,过渡层由合金珠光体组成,受影响层为贫碳区;研究表明感应加热 Mo 渗层的最高硬度为 560 HV0. 2 ,约为原始试样的两倍,IHM-1200 试样的的摩擦因数为 0. 73,比原始试样低 0. 12,磨损质量略低于原始试样,Mo 渗层显著提高 40Cr 钢的摩擦性能。
关键词:  40Cr 钢  包埋渗  Mo 渗层  摩擦性能
DOI：10.11933/j.issn.1007-9289.20201231003
分类号:TG156;TB31
基金项目:国家自然科学基金(51575073)和重庆市基础科学与前沿技术研究专项(cstc2017jcyjBX0031)资助项目
Microstructure and Tribological Properties of Mo-coating Prepared by Pack-cementation on 40Cr Steel
Hu Jianjun1,2, Zhao Xue1, Guo Ning3, Yang Xian1, Li Hui1, Xu Hongbin2
1.College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054 , China;2.Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing 400054 , China;3.School of Materials and Energy, Southwest University, Chongqing 400715 , China
Abstract:
Thermal-diffusion molybdenizing is one of the methods uesd for modifying the chemical composition of steel surface. Mo can improve hardenability of steel, interact with carbon to form carbides with high melting point, and improve the wear resistance of the steel surface. In order to explore the thermal-diffusion molybdenizing process, Mo-coatings are prepared on 40Cr steel by pack-cemen- tation treatment via box-furnace heating and induction heating at 1 000-1 300 ℃ . Microstructure, element distributions, phases and tri- bological properties of the treated samples are characterized and studied by the field emission gun scanning electron microscope (FEG- SEM), X-ray diffraction (XRD) and friction and wear testing machine. The evolution mechanism of the microstructure of molybden- izing by induction heating is described. The results showed that no obvious Mo-containing layer was observed when heated by the box- furnace at 1 100 ℃ , but a 30-70 μm thick Mo-containing layer is formed by induction heating at 1 000-1 300 ℃ . The cross-sectional structure of the samples after induction heating pack-cementation is composed of Mo-coating, transition layer, affected-layer and sub- strate. The Mo-coating is mainly composed of Fe-Mo solid solution and Mo containing carbides phase, the transition layer consisted of alloy pearlite, and the affected layer was a carbon-poor zone. Studies show that the highest hardness of the Mo-coating is 560 HV0. 2 ,which is about twice that of the untread sample. The friction coefficient of the IHM-1200 sample is 0. 73, which is 0. 12 lower than theuntreated sample. The mass loss is slightly lower than the untreated sample. Friction properties was significantly improved after the for- mation of the Mo-coating on the 40Cr steel.
Key words:  40Cr steel  pack-cementation  Mo-coating  tribological properties
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