Microstructure and wear resistance of laser cladded Ni-Cr-Co-Ti-V high-entropy alloy coating after laser remelting processing

被引：153
作者：
Cai, Zhaobing [1 ,2 ]
Cui, Xiufang [1 ]
Liu, Zhe [2 ]
Li, Yang [1 ]
Dong, Meiling [1 ,2 ]
Jin, Guo [1 ]
机构：
[1] Harbin Engn Univ, Inst Surface Interface Sci & Technol, Key Lab Superlight Mat & Surface Technol, Coll Mat Sci & Chem Engn,Minist Educ, Harbin 150001, Heilongjiang, Peoples R China
[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Heilongjiang, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2018年 / 99卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
High-entropy alloy coating; Laser remelting; Wear resistance; Micro-hardness microstructure; MECHANICAL-PROPERTIES; CORROSION PROPERTIES; AMORPHOUS PHASE; FORMING ABILITY; BEHAVIOR; CU; EVOLUTION; SUBSTRATE; LAYER; NB;
D O I：
10.1016/j.optlastec.2017.09.012
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An attempt, combined with the technologies of laser cladding and laser remelting, has been made to develop a Ni-Cr-Co-Ti-V high entropy alloy coating. The phase composition, microstructure, micro hardness and wear resistance (rolling friction) were studied in detail. The results show that after laser remelting, the phase composition remains unchanged, that is, as-cladded coating and as-remelted coatings are all composed of (Ni, Co)Ti-2 intermetallic compound, Ti-rich phase and BCC solid solution phase. However, after laser remelting, the volume fraction of Ti-rich phase increases significantly. Moreover, the micro-hardness is increased, up to similar to 900 HV at the laser remelting parameters: laser power of 1 kW, laser spot diameter of 3 mm, and laser speed of 10 mm/s. Compared to the as-cladded high-entropy alloy coating, the as-remelted high-entropy alloy coatings have high friction coefficient and low wear mass loss, indicating that the wear resistance of as-remelted coatings is improved and suggesting practical applications, like coatings on brake pads for wear protection. The worn surface morphologies show that the worn mechanism of as-cladded and as-remelted high-entropy alloy coatings are adhesive wear. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：276 / 281
页数：6
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