激光熔覆TiC/FeAl原位复合涂层

doi:10.11901/1005.3093.2017.148

材料研究学报

2017, Vol. 31

Issue (11): 860-866 DOI: 10.11901/1005.3093.2017.148

研究论文

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激光熔覆TiC/FeAl原位复合涂层

赵龙志¹(

), 杨海超¹, 赵明娟¹, 谢玉江²

1 华东交通大学材料科学与工程学院南昌 330013。
2 中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016。

In-situ TiC/FeAl Composite Coating Fabricated by Laser Cladding

Longzhi ZHAO¹(

), Haichao YANG¹, Mingjuan ZHAO¹, Yujiang XIE²

1 Materials Science and Engineering College, East China Jiaotong University, Nanchang 330013, China.
2 State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China.

引用本文:

赵龙志, 杨海超, 赵明娟, 谢玉江. 激光熔覆TiC/FeAl原位复合涂层[J]. 材料研究学报, 2017, 31(11): 860-866.
Longzhi ZHAO, Haichao YANG, Mingjuan ZHAO, Yujiang XIE. In-situ TiC/FeAl Composite Coating Fabricated by Laser Cladding[J]. Chinese Journal of Materials Research, 2017, 31(11): 860-866.

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摘要:

用激光熔覆法制备了TiC/FeAl原位复合涂层,使用光学显微镜(OM)和扫描电镜(SEM)观察了熔覆层的微观结构,使用能谱分析仪(EDS)和X射线衍射仪(XRD)分析了涂层的化学成分和物相,研究了熔覆层的显微硬度和耐磨性。结果表明：沿着熔池深度的方向从熔池底部到熔池顶部,FeAl基体从粗大的树枝晶渐渐转变为细小的等轴晶。原位TiC越过熔池界面进入基板表层,大部分TiC颗粒存在FeAl晶粒内部,熔池顶部的TiC颗粒含量较多。沿着熔池深度的方向从涂层顶部到基板,涂层的硬度呈阶梯形分布,熔池顶部涂层的硬度最高,涂层的硬度和耐磨性分别比基板高6倍和52倍。涂层的磨损机理为典型的磨粒磨损。

关键词 ：材料表面与界面, 激光熔覆, 原位TiC/FeAl复合涂层, 微观结构, 硬度, 耐磨性

Abstract：

The in-situ TiC/FeAl composite coating was fabricated by laser cladding technology in this paper. The microstructure of the coating was characterized by metallographic microscope (OM), scanning electron microscopy(SEM).The phases in the coating were examined by energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), microhardness and wear resistance of the coating were also investigated. The results show that from the bottom to the surface of the melt pool along the depth the coarse dendrite grain is changed into fine quiaxed rosette grain. Some TiC particles going across the interface exist in the surface layer of the substrate. Most of TiC particles existing in the grains are nucleation centers during FeAl matrix solidification. The content of TiC particles in the top of the coating is much higher than that in other zone of the coating. Meanwhile, the microhardness and wear resistance of in-situ laser cladding are 5 times and 52 higher than those of substrate, respectively. And the wear mechanism of the composite coating is abrasive wear.

Key words： surface and interface in the materials laser cladding in-situ TiC/FeAl composite coating microstructure microhardness wear resistance

收稿日期: 2017-02-22

基金资助:资助项目国家自然科学基金(51265014,51465019) 江西省科技厅科研项目(20142BDH80004, 20153BCB23005和20151BAB206044) 江西省教育厅科研项目(KJLD14040和GJJ150487)

作者简介:

赵龙志,男,1977年生,博士

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表1 A283GRC钢化学成分

图1 熔覆层的宏观形貌

图2 熔覆层的横截面宏观形貌

图3 熔覆层微观结构 (a)界面熔合区 (b)熔池底部 (c)中部 (d)顶部涂层的微观结构

图4 Fe-Al-Ti-C体系中主要反应产物的吉布斯自由能随温度变化关系曲线

图5 激光熔覆制备TiC/FeAl复合涂层EDS能谱分析

图6 熔覆层的XRD图谱

图7 熔覆层熔池深度方向的显微硬度分布

图8 基板和熔覆层的磨损率

图9 涂层磨损表面形貌

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