Laser cladding of Ni-base composite coatings onto Ti-6Al-4V substrates with pre-placed B4C+NiCrBSi powders

被引：100

作者：

Meng, QW ^{[1
]}

Geng, L ^{[1
]}

Zhang, BY ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2006年 / 200卷 / 16-17期

关键词：

laser cladding; composite coating; Ti-6Al-4V; in-situ synthesis;

D O I：

10.1016/j.surfcoat.2005.04.059

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

NiCrBSi+5 wt.%B4C powders were pre-placed and then laser clad onto Ti-6Al-4V substrates. Microstructure and morphology of the coatings were examined using an X-ray diffractometer, an electron probe X-ray microanalyzer and a scanning electron microscope with an energy dispersive spectroscopy. The microhardness of the coating was measured using a Vickers hardness tester. After laser cladding, a good metallurgical bond without cracks and pores was obtained. A reaction between B4C and Ti occurred, leading to an in-situ synthesis of TiB2 and TiC reinforcements in the coating. The coating mainly consists of gamma-Ni as the matrix phase and TiB2, TiC and CrB reinforcements. The average microhardness of the composite coating is HV 1300 and it is three times higher than that of the Ti-6Al-4V substrate. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：4923 / 4928

页数：6

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