TiC对耐磨MoFeB熔覆层组织与性能的影响

Effect of TiC on Microstructure and Properties of Wear-Resistant MoFeB Claddings.

作者信息

Sun Yiqun, Sun Junsheng, Jin Jun, Xu Hu

机构信息

Laoshan Campus, Ocean University of China, Qingdao 266100, China.

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China.

出版信息

Materials (Basel). 2022 Jun 23;15(13):4441. doi: 10.3390/ma15134441.

DOI:10.3390/ma15134441

PMID:35806566

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9267552/

Abstract

Alloy blocks with different TiC content were designed, and MoFeB cermets were prepared by carbon arc surfacing process. The interaction law of TiC content and the microstructure, phase, composition, hardness and wear resistance of the cladding were studied in detail by the combination of experiment and theoretical analysis. On the other hand, the phase transition process of the weldpool is theoretically analyzed by thermodynamic calculation method. XRD test results show that in addition to MoFeB synthesized in situ, the cladding also forms phases such as TiC, CrB, MoB and Fe-Cr. The number of MoFeB hard phases gradually increases when TiC content varies from 0% to 15%. The average microhardness of the cladding with 0%, 5%, 10%, and 15% TiC was 992 HV0.5, 1035 HV0.5, 1018 HV0.5 and 689 HV0.5, respectively, with 5% TiC being the largest. Moreover, the cladding with 5% TiC content has excellent wear resistance, which is 14.6 times that of the substrate.

摘要

设计了不同TiC含量的合金块，并通过碳弧堆焊工艺制备了MoFeB金属陶瓷。通过实验与理论分析相结合的方法，详细研究了TiC含量与熔覆层的微观组织、相、成分、硬度及耐磨性之间的相互作用规律。另一方面，采用热力学计算方法对熔池的相变过程进行了理论分析。XRD测试结果表明，熔覆层中除原位合成的MoFeB外，还形成了TiC、CrB、MoB和Fe-Cr等相。当TiC含量从0%变化到15%时，MoFeB硬质相的数量逐渐增加。TiC含量为0%、5%、10%和15%的熔覆层平均显微硬度分别为992 HV0.5、1035 HV0.5、1018 HV0.5和689 HV0.5，其中5%TiC时最大。此外，TiC含量为5%的熔覆层具有优异的耐磨性，是基体的14.6倍。