Effect of heat input on the microstructure of in-situ synthesized TiN-TiB/Ti based composite coating by laser cladding

被引：82
|
作者：
Li, M. [1 ]
Huang, J. [1 ]
Zhu, Y. Y. [1 ]
Li, Z. G. [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2012年 / 206卷 / 19-20期
关键词：
Laser cladding; In situ; TiN-TiB/Ti based composite coating; WEAR-RESISTANCE; SURFACE MODIFICATION; FORMATION MECHANISM; TI-6AL-4V; BN; AL;
D O I：
10.1016/j.surfcoat.2012.03.082
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In situ synthesized TiN and TiB particulate-reinforced metal matrix composite coating was formed on Ti-3Al-2V alloy by laser cladding with a Ti/h-BN powder mixture. The phase structure, microstructure, microhardness and wear performance of the composite clad layer were analyzed by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), micro-hardness tester and wear testing machine. It has been found that the clad layer mainly consisted of alpha-Ti, TiN and Ti4N3-x at the laser power density of 120 W/mm(2); While, TiB and TiN were synthesized at the laser power densities of 150 and 180 W/mm(2). TiN and TiB were compared with dendrite and needle platelet type microstructures. The microhardness of laser clad layer was 800-1200 HV0.3 which was about 5 times of the substrate. The lost height of the substrate is almost 2 times of the clad layers. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：4021 / 4026
页数：6
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