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

被引：84

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

页码：4021 / 4026

页数：6

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