Microstructure and cavitation erosion behavior of WC-Co-Cr coating on 1Cr18Ni9Ti stainless steel by HVOF thermal spraying

被引：79

作者：

Wu, Yuping ^{[1
]}

Hong, Sheng ^{[1
]}

Zhang, Jianfeng ^{[2
]}

He, Zhihua ^{[1
]}

Guo, Wenmin ^{[1
]}

Wang, Qian ^{[1
]}

Li, Gaiye ^{[1
]}

机构：

[1] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Peoples R China

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2012年 / 32卷

基金：

中国博士后科学基金;

关键词：

WC-Co-Cr coating; HVOF thermal spray; Cavitation erosion; ABRASIVE WEAR BEHAVIOR; TIN COATINGS; RESISTANCE; PARAMETERS; ALLOYS;

D O I：

10.1016/j.ijrmhm.2012.01.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A WC-Co-Cr coating was deposited by a high velocity oxy-fuel thermal spray (HVOF) onto a 1Cr18Ni9Ti stainless steel substrate to increase its cavitation erosion resistance. After the HVOF process, it was revealed that the amorphous phase, nanocrystalline grains (Co-Cr) and several kinds of carbides, including Co3W3C, Co6W6C, WC, Cr23C6, and Cr3C2 were present in the coating. The hardness of the coating was improved to be 11.3 GPa, about 6 times higher than that of the stainless steel substrate, 1.8 GPa. Due to the presence of those new phases in the as-sprayed coating and its higher hardness, the cavitation erosion mass loss eroded for 30 h was only 64% that of the stainless steel substrate. The microstructural analysis of the coating after the cavitation erosion tests indicated that most of the corruptions took place at the interface between the un-melted or half-melted particles and the matrix (Co-Cr), the edge of the pores in the coating, and the boundary of the twin and the grain in the stainless steel 1Cr18Ni9Ti. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：21 / 26

页数：6

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