B4C添加量对42CrMo钢表面Stellite6+B4C激光熔覆层形貌与性能的影响

doi:10.13251/j.issn.0254-6051.2024.07.031

摘要/Abstract

摘要： 针对采煤机截齿表面改性问题,利用X射线衍射仪、扫描电镜、维氏显微硬度计、多功能摩擦磨损试验机和电化学工作站研究了不同B₄C添加量 (3%、5%、7%) 对42CrMo钢表面激光熔覆Stellite6+B₄C熔覆层截面形貌、显微硬度、耐磨性及耐腐蚀性的影响。结果表明:当B₄C添加量为3%和5%时,熔覆层截面形貌较好,当B₄C添加量为7%时,熔覆层表面出现较多缺陷。随着B₄C添加量的提升,熔覆层显微硬度从781.04 HV提升到1044.72 HV,平均摩擦因数下降,磨损量先减小后增大。当B₄C添加量为7%时,熔覆层平均摩擦因数为0.42,但由于其成形质量较差,导致其磨损量较高,为1.9 mg,当B₄C添加量为5%时,熔覆层磨损量最小,为0.6 mg。熔覆层的耐腐蚀性随B₄C添加量的增加先增强后降低,当B₄C添加量为5%时,熔覆层的自腐蚀电位最高,自腐蚀电流密度最小,电荷转移电阻R_ct最大,熔覆层的耐腐蚀性最好。

关键词: 采煤机截齿, 激光熔覆, Stellite6+B₄C熔覆层, 耐磨性, 耐腐蚀性

Abstract: In view of the surface modification of shearer picks, effect of B₄C addition (3%, 5% and 7%) on the cross-section morphology, microhardness, wear resistance and corrosion resistance of the Stellite6+B₄C laser clad layers on 42CrMo steel was studied by means of X-ray diffractometer, scanning electron microscope, Vickers microhardness tester, multifunctional friction and wear testing machine and electrochemical workstation. The results show that the cross-section morphology of the clad layer is good when the B₄C addition is 3% and 5%, however, when the B₄C addition is 7%, there are many defects on the surface of the clad layer. With the increase of B₄C addition, the microhardness of the clad layer increases from 781.04 HV to 1044.72 HV, the average friction coefficient decreases and the wear loss decreases first and then increases. When the B₄C addition is 7%, the average friction coefficient of the clad layer is 0.42, but due to the poor forming quality, the wear loss is the highest as 1.9 mg. When the B₄C addition is 5%, the wear loss is the least as 0.6 mg. The corrosion resistance of the clad layer first increases and then decreases with the increase of B₄C addition. When the B₄C addition is 5%, the self-corrosion potential of the clad layer is the highest, the self-corrosion current density is the smallest, and the charge transfer resistance R_ct is the largest, the best corrosion resistance of the clad layer is obtained.

Key words: shearer pick, laser cladding, Stellite6+B₄C clad layer, wear resistance, corrosion resistance

中图分类号:

TG178.1

张泽疆, 李新梅, 朱春金, 李航, 杨定力. B₄C添加量对42CrMo钢表面Stellite6+B₄C激光熔覆层形貌与性能的影响[J]. 金属热处理, 2024, 49(7): 200-207.

Zhang Zejiang, Li Xinmei, Zhu Chunjin, Li Hang, Yang Dingli. Effect of B₄C addition on morphology and properties of Stellite6+B₄C laser clad layers on 42CrMo steel surface[J]. Heat Treatment of Metals, 2024, 49(7): 200-207.

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B₄C添加量对42CrMo钢表面Stellite6+B₄C激光熔覆层形貌与性能的影响

Effect of B₄C addition on morphology and properties of Stellite6+B₄C laser clad layers on 42CrMo steel surface

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