Comparison of three kinds of MC-type carbide modified thick W coatings fabricated by plasma transferred arc surfacing

被引：12

作者：

Hou, Qing Yu ^{[1
,2
]}

Luo, Lai Ma ^{[1
]}

Huang, Zhen Yi ^{[2
]}

Wang, Ping ^{[2
]}

Ding, Ting Ting ^{[2
]}

Wu, Yu Cheng ^{[1
]}

机构：

[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China

[2] Anhui Key Lab Met Mat & Proc, Maanshan 243002, Anhui, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2015年 / 283卷

基金：

中国博士后科学基金;

关键词：

Thick W-based coating; Plasma transferred arc (PTA); Microstructure; Nano-indentation properties; MECHANICAL-PROPERTIES; FUSION APPLICATIONS; POWDER DIFFRACTION; TUNGSTEN; COMPOSITES; ALLOYS; INDENTATION; PERFORMANCE; PARAMETERS; OXYGEN;

D O I：

10.1016/j.surfcoat.2015.10.059

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Three kinds of W-based composite powders containing NbC, TiC and VC were prefabricated on a carbon steel substrate, respectively. Prefabricated powders were then processed by plasma transferred arc (PTA) surfacing to form thick W-NbC, W-TiC and W-VC coatings, respectively. Microstructures and nano-indentation properties of the three kinds of coatings were investigated and compared. It was observed that, in addition to W and MC-type carbide phases. Fe7W6 phase was formed in the three kinds of coatings because of the dilution effect of Fe from the substrates. The relative contents of Fe7W6 phase in the W-NbC, W-TiC and W-VC coating were 48.1 wt.%, 52.2 wt.% and 36.3 wt.%, respectively. Tungsten grain size in the W-NbC coating was about 2.8 mu m, which was smaller than that in the W-TiC coating (about 3.4 mu m) and that in the W-VC coating (about 4.7 mu m). There was no simple relation between the mechanical response and the nano-indentation hardness H or the effective Young's modulus E* alone; however, this response was strongly dependent on the ratio H/E*. For coatings with high H/E* value, the elastic recovery was also be larger. The best ability to resist elastic strain-to-failure and the highest toughness were obtained in the W-VC coating when compared with that in the W-NbC and W-TiC coatings. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：52 / 60

页数：9

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