离焦量对MoS2改性Fe-Cr-Mo-Si合金涂层组织与性能的影响

doi:10.13251/j.issn.0254-6051.2022.05.043

金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 246-251.DOI: 10.13251/j.issn.0254-6051.2022.05.043

离焦量对MoS₂改性Fe-Cr-Mo-Si合金涂层组织与性能的影响

董月¹, 舒林森^1,2

1.陕西理工大学机械工程学院, 陕西汉中 723001;
2.陕西省工业自动化重点实验室, 陕西汉中 723001

收稿日期:2021-12-28 修回日期:2022-03-16 出版日期:2022-05-25 发布日期:2022-06-16
通讯作者: 舒林森,副教授,博士,E-mail: shulinsen19@163.com
作者简介:董月(1997—),女,硕士研究生,主要研究方向为再制造工艺,E-mail: 792085589@qq.com。
基金资助:
国家自然科学基金(51505268);陕西省工业自动化重点实验室开放课题研究基金(SLGPT2019KF01-16);陕西省教育厅重点科研计划(20JS020)

Effect of defocusing amount on microstructure and properties of MoS₂ modified Fe-Cr-Mo-Si alloy coating

Dong Yue¹, Shu Linsen^1,2

1. School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong Shaanxi 723001, China;
2. Shaanxi Key Laboratory of Industrial Automation, Hanzhong Shaanxi 723001, China

Received:2021-12-28 Revised:2022-03-16 Online:2022-05-25 Published:2022-06-16

摘要/Abstract

摘要： 采用激光熔覆技术在40Cr钢基材上制备了MoS₂改性的Fe-Cr-Mo-Si合金复合涂层,研究了离焦量对复合涂层的宏观形貌、微观组织、显微硬度及耐摩擦磨损性能的影响。结果表明,随着离焦量的增大,复合涂层表面越光滑平整,复合涂层与基材间冶金结合越好;复合涂层上部为细小的等轴晶,中部为树枝晶,底部为垂直熔合线生长的柱状晶及平面晶,等轴晶晶粒尺寸随离焦量增大而减小;随着离焦量的增大,复合涂层硬度值随之增大,离焦量为2 mm时复合涂层上部显微硬度值最高,达696.1 HV0.5,约为基材(230.6 HV0.5)硬度的3倍;在相同磨损工况下,复合涂层平均摩擦因数及磨损量随离焦量增大而减小,在离焦量为2 mm时具有最小磨损量0.010 g,仅为Fe基涂层磨损量的21.7%;复合涂层磨损机制为磨粒磨损和粘着磨损,随着离焦量的增大,复合涂层表面磨损程度越小,耐磨性能越好。

关键词: 激光熔覆, 离焦量, MoS₂, Fe-Cr-Mo-Si合金涂层, 微观组织, 摩擦磨损

Abstract: MoS₂ modified Fe-Cr-Mo-Si alloy coating was prepared on 40Cr steel substrate by laser cladding technology. The effect of defocusing amount on macro morphology, microstructure, microhardness and friction and wear resistance of the composite coating was studied. The results show that with the increase of defocusing amount, the smoother the composite coating surface, the better metallurgical bonding between the composite coating and the substrate. The upper part of the composite coating is fine equiaxed crystal, the middle is dendrite, and the bottom is columnar and plane crystal grown perpendicular to the fusion line. The grain size of equiaxed crystal decreases with the increase of defocusing amount. With the increase of defocusing amount, the hardness value of composite coating increases accordingly, and the highest microhardness value appears in the upper part of the composite coating when the defocusing amount is 2 mm, up to 696.1 HV0.5, about 3 times of that of the substrate (230.6 HV0.5). Under the same wear condition, the average friction coefficient and wear loss of composite coating decrease with the increase of defocusing amount. When the defocusing amount is 2 mm, the minimum wear loss is 0.010 g, which is only 21.7% of that of the Fe based coating. The wear mechanism of composite coating is abrasive wear and adhesion wear. With the increase of defocusing amount, the smaller the wear degree of the composite coating surface, the better the wear resistance.

Key words: laser cladding, defocusing amount, MoS₂, Fe-Cr-Mo-Si alloy coating, microstructure, friction and wear

中图分类号:

TN249

董月, 舒林森. 离焦量对MoS₂改性Fe-Cr-Mo-Si合金涂层组织与性能的影响[J]. 金属热处理, 2022, 47(5): 246-251.

Dong Yue, Shu Linsen. Effect of defocusing amount on microstructure and properties of MoS₂ modified Fe-Cr-Mo-Si alloy coating[J]. Heat Treatment of Metals, 2022, 47(5): 246-251.

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离焦量对MoS₂改性Fe-Cr-Mo-Si合金涂层组织与性能的影响

Effect of defocusing amount on microstructure and properties of MoS₂ modified Fe-Cr-Mo-Si alloy coating

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