Microstructures and wear properties of laser cladding Co-based composite coatings on Ti-6Al-4V

被引：130
作者：
Weng, Fei [1 ,3 ]
Yu, Huijun [2 ,3 ]
Chen, Chuanzhong [1 ,3 ]
Dai, Jingjie [1 ,3 ,4 ]
机构：
[1] Shandong Univ, Dept Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
[2] Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Manufacture, Minist Educ, Jinan 250061, Shandong, Peoples R China
[3] Shandong Univ, Suzhou Inst, Suzhou 215123, Peoples R China
[4] Qingdao Binhai Univ, Sch Mech & Elect Engn, Qingdao 266555, Shandong, Peoples R China
来源：
MATERIALS & DESIGN | 2015年 / 80卷
关键词：
Laser cladding; Microstructure; Wear; Ti-6Al-4V; DRY SLIDING WEAR; SURFACE PERFORMANCE; POWDER STREAM; PURE TITANIUM; TI ALLOY; RESISTANCE; BEHAVIOR; LAYER; COMBINATION; MECHANISM;
D O I：
10.1016/j.matdes.2015.05.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Metal matrix composite (MMC) coatings were fabricated on Ti-6Al-4V titanium alloy by laser cladding. Co42 self-fluxing powder, B4C, SiC and Y2O3 were employed as the cladding materials. Microstructures and the wear properties of the different composite coatings were investigated comparatively. Results showed that the laser cladding coatings were mainly reinforced by CoTi, CoTi2, NiTi, TiC, TiB2, TiB, Cr7C3 and Ti5Si3. The micro-hardness of the cladding coatings were equivalent to 3-4 times the Ti-6Al-4V substrate. Laser cladding coating exhibiting outstanding wear resistance was fabricated with the addition of 20 wt.% B4C, 7 wt.% SiC and 1 wt.% Y2O3. The wear resistance was enhanced by over 10 times compared with the substrate. However, with more SiC addition (14 wt.%), a higher micro-hardness was obtained together with poor wear resistance. The wear mechanism of the coatings was discussed by referring to the microstructures and the wear morphologies. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：174 / 181
页数：8
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