Microstructure and high temperature oxidation resistance of Ti-Ni gradient coating on TA2 titanium alloy fabricated by laser cladding

被引：69

作者：

Liu, Fencheng ^{[1
]}

Mao, Yuqing ^{[2
]}

Lin, Xin ^{[2
]}

Zhou, Baosheng ^{[1
]}

Qian, Tao ^{[1
]}

机构：

[1] Nanchang Hangkong Univ, Natl Def Key Discipline Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China

[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

OPTICS AND LASER TECHNOLOGY | 2016年 / 83卷

基金：

中国国家自然科学基金;

关键词：

Titanium alloy; Laser cladding; Nickel based Coating; Oxidation resistance; BACTERIAL ADHESION;

D O I：

10.1016/j.optlastec.2016.04.005

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

To improve the high temperature oxidation resistance of TA2 titanium alloy, a gradient Ni-Ti coating was laser cladded on the surface of the TA2 titanium alloy substrate, and the microstructure and oxidation behavior of the laser cladded coating were investigated experimentally. The gradient coating with a thickness of about 420-490 mu m contains two different layers, e.g. a bright layer with coarse equiaxed grain and a dark layer with fine and columnar dendrites, and a transition layer with a thickness of about 10 gm exists between the substrate and the cladded coating. NiTi, NiTi2 and Ni3Ti intermetallic compounds are the main constructive phases of the laser cladded coating. The appearance of these phases enhances the microhardness, and the dense structure of the coating improves its oxidation resistance. The solidification procedure of the gradient coating is analyzed and different kinds of solidification processes occur due to the heat dissipation during the laser cladding process. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：140 / 147

页数：8

共 18 条

[1] Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation [J].