线圈扫描速度对感应熔覆NiCrBSi涂层组织与性能的影响

doi:10.11896/cldb.19020143

材料导报

2020, Vol. 34

Issue (6): 6120-6125 https://doi.org/10.11896/cldb.19020143

金属与金属基复合材料

线圈扫描速度对感应熔覆NiCrBSi涂层组织与性能的影响

张梦清¹, 乔玉林¹, 吉小超¹, 周克兵¹, 张伟², 于鹤龙¹

1 陆军装甲兵学院再制造技术重点实验室,北京 100072;
2 京津冀再制造产业技术研究院,沧州 061000

Effect of Coil-scanning-speed on Microstructures and Properties of NiCrBSi Coating by Induction Cladding Method

ZHANG Mengqing¹, QIAO Yulin¹, JI Xiaochao¹, ZHOU Kebing¹, ZHANG Wei², YU Helong¹

1 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;
2 Institute of Remanufacturing Industry & Technology, Jing-jin-ji, Cangzhou 061000, China

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摘要以自熔性合金粉末Ni60为原料,采用预置涂层结合高频感应熔覆技术在45钢基体表面制备了NiCrBSi涂层,利用场发射扫描电镜、X射线衍射仪、显微硬度计和CETR摩擦磨损试验机等设备研究了感应线圈扫描速度对涂层微观组织、显微硬度和摩擦学性能的影响。结果表明,感应熔覆NiCrBSi涂层组织致密、内部无孔隙和裂纹等缺陷,涂层由γ-Ni/Fe基质相和弥散分布的Cr₇C₃、Cr₂₃C₆、CrB等硬质析出相构成。熔覆层最高硬度为980HV_0.2,涂层内部残余应力呈压应力状态。随着线圈扫描速度的增大,涂层热输入量降低,熔池冷却凝固速度加快,一方面导致界面区域元素扩散减弱,涂层稀释率降低,界面过渡区宽度减小;另一方面造成涂层晶粒和析出相尺寸细化,涂层显微硬度升高,涂层磨损形式由以粘着磨损为主向以磨粒磨损为主转变,同时残余压应力增大,使得涂层耐磨性提高。

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关键词: 高频感应熔覆 NiCrBSi涂层线圈扫描速度抗磨性

Abstract: NiCrBSi coating was prepared by melting the Ni60 powder on 45 steel substrate with induction cladding (IC) method.The influence of coil-scanning-speed on microstructures and properties of the coating was investigated by using SEM,XRD, microhardness tester and CETR tribometer. Results show that: the main phases of the coating are γ-Ni/Fe, Cr₇C₃, Cr₂₃C₆, CrB et al. As the coil scanning speed decreases, the size of the precipitated phase in the cladding layer becomes larger, the element diffusion increases, and the width of the diffusion transfer belt increases. The sectional hardness distribution decreases as the scanning speed decreases, and the maximum hardness of the cladding layer is 980HV_0.2. The residual stress inside the coating is compressive stress. As the scanning speed of the coil increases, the heat input of the coating decreases, the cooling and solidification speed of the molten pool increases. On the one hand, the diffusion of elements in the interface region is weakened, the dilution ratio of the coating decreases, and the width of the interface transition region decreases. On the other hand, the size of the layer grains and the precipitated phase are refined, the microhardness of the coating is increased, and the wear form of the coating is mainly changed from adhesive wear to abrasive wear, the residual compressive stress is increased, resulting in improved coating wear resistance.

Key words: induction cladding NiCrBSi coating coil-scanning-speed wear resistance

发布日期: 2020-03-12

ZTFLH:

TG174.44

基金资助: 国家重点研发计划(2017YFB0310703;2017YFF0207905)

作者简介: 张梦清,2014年12月毕业于中国人民解放军陆军装甲兵学院,获得工学硕士学位。于2015年3月至今在中国人民解放军装甲兵学院攻读博士学位,主要从事表面工程和摩擦学领域的研究;于鹤龙,陆军装甲兵学院装备再制造技术国防科技重点实验室副主任、副研究员。2016年毕业于中国人民解放军装甲兵工程学院,获得工学博士学位。主要从事装备再制造、表面工程与军用新材料领域的研究工作。在国内外重要期刊发表学术论文50余篇,申报国家发明专利20余项。

引用本文:

张梦清, 乔玉林, 吉小超, 周克兵, 张伟, 于鹤龙. 线圈扫描速度对感应熔覆NiCrBSi涂层组织与性能的影响[J]. 材料导报, 2020, 34(6): 6120-6125.
ZHANG Mengqing, QIAO Yulin, JI Xiaochao, ZHOU Kebing, ZHANG Wei, YU Helong. Effect of Coil-scanning-speed on Microstructures and Properties of NiCrBSi Coating by Induction Cladding Method. Materials Reports, 2020, 34(6): 6120-6125.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.19020143 或 http://www.mater-rep.com/CN/Y2020/V34/I6/6120

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