Processing-structure-property correlation and decarburization phenomenon in detonation sprayed WC-12Co coatings

被引：110

作者：

Babu, P. Suresh ^{[2
]}

Basu, Bikramjit ^{[1
]}

Sundararajan, G. ^{[2
]}

机构：

[1] Indian Inst Technol, Dept Mat & Met Engn, Kanpur 208016, Uttar Pradesh, India

[2] Int Adv Res Ctr Powder Met & New Mat, Hyderabad 500005, Andhra Pradesh, India

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 18期

关键词：

Thermal spray; Cermet; Coatings; Decarburization; Hardness;

D O I：

10.1016/j.actamat.2008.06.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we demonstrate how the microstructure evolution in terms of nature/extent of decomposition of WC as well as properties of WC-12wt.% Co coatings is critically dependent on variation of oxygen-fuel (OF) ratio. The coating deposition was carried out over a wide range of OF ratios using a detonation spray technique, and particle velocity was measured using a high-speed particle diagnostics system. The presence of free W and increased W2C phase is observed under deposition at higher OF ratios of 1.5 or 2.0, and this has been confirmed using XRD, EBSD and SEM-EDS elemental mapping. In order to obtain representative hardness and modulus of the as-deposited coatings, careful measurements and analysis of indentation response (cross-section and surface) were carried out using nanoindentation and Vickers hardness testers. Based on our experimental results, a major emphasis has been put forward to establish a processing structure-property correlation for detonation sprayed WC-12Co coatings. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5012 / 5026

页数：15

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