Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding

被引：8

作者：

牛伟 ^{[1
]}

孙荣禄 ^{[1
,2
]}

雷贻文

郭喜华 ^{[1
]}

机构：

[1] School of Mechanical and Electronic Engineering ,Tianjin Polytechnic University

[2] Tianjin Area Major Laboratory of Advanced Mechanical and Electronics Equipment

来源：

中国激光 | 2008年 / 11期

关键词：

laser technique; laser cladding; composites coating; microstructure; mechanism;

D O I：

暂无

中图分类号：

TG174.44 [金属复层保护];

学科分类号：

摘要：

Titanium matrix composite coatings were fabricated on Ti-6A1-4V substrate by laser cladding using powder mixtures of Ti+Cr3C2 and Ti+TiB2, respectively. The chemical compositions and mi-crostructures of the coatings were analyzed using scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Microhardness was measured by a microhardness tester. The results showed that Cr3C2 particles were dissolved and deposited to form dendritic TiC in the upper section and spherical grain TiC in the bottom of Cr3C2+Ti coating. Most of TiB2 was dissolved in the molten pool by laser irradiation, then formed TiB with fine needles and coarse needles in the TiB2+Ti coating. A few quasi-melted TiB2 particles with irregular shape at the bottom of the coating were observed. The average microhardnesses were approximately HV850-V1000, HV800-V1050 in the Cr3C2+Ti and TiB2+Ti coating, respectively, which were 2-3 times higher than that of Ti-6A1-4V substrate.

引用

页码：1756 / 1759

页数：4

共 3 条

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