Microstructure and properties of TiB/Ti-6Al-4V coatings produced with laser treatments

被引：39

作者：

Galvan, D

Ocelík, V

Pei, Y

Kooi, BJ

De Hosson, JTM

Ramous, E

机构：

[1] Ctr Mat Sci, Dept Appl Phys, NL-9747 AG Groningen, Netherlands

[2] Netherlands Inst Met Res, NL-9747 AG Groningen, Netherlands

[3] Univ Padua, DIMEG, I-35131 Padua, Italy

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2004年 / 13卷 / 04期

关键词：

laser processing; microstructure; TiB coatings; wear properties;

D O I：

10.1361/10599490419919

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

TiB/Ti-6Al-4V metal-matrix composite (MMC) layers were produced on Ti-6Al-4V substrates by laser cladding. A TiB2/Ti powder mixture was used as a precursor to obtain a dispersion of TiB needles in the Ti alloy matrix, with the aid of an exothermic reaction between TiB, and Ti. A eutectic microstructure was obtained that consisted of an extremely homogeneous dispersion of TiB eutectic needles in the Ti alloy matrix, having a volume fraction as high as 0.33. Also, an equilibrium-like microstructure was found, consisting of a dispersion of both primary and eutectic TiB needles inside the Ti alloy matrix. An analysis of the geometry of the layers was performed and proved successful in determining the percentage of B. Further, it correctly predicted the variation of atomic B content as a function of laser power. The relative wear resistance coefficient, defined as the wear coefficient of the uncoated matrix divided by that of coating, shows an improvement by a factor as high as 1500 for the eutectic microstructure.

引用

页码：406 / 412

页数：7

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