Microstructures and abrasive wear performance of PTAW deposited Ni-WC overlays using different Ni-alloy chemistries

被引：100

作者：

Liyanage, T. ^{[1
]}

Fisher, G. ^{[2
]}

Gerlich, A. P. ^{[1
]}

机构：

[1] Univ Alberta, Edmonton, AB T6G 2V4, Canada

[2] Alberta Innovates Technol Futures, Edmonton, AB T6N 1E4, Canada

来源：

WEAR | 2012年 / 274卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Three-body abrasion; Hardness; Metal-matrix composite; Hardfacing; Mining; Mineral processing; Electron microscopy; TUNGSTEN CARBIDE; COATINGS; RESISTANCE; COMPOSITES; BEHAVIOR; HARD; PHASE; MMCS;

D O I：

10.1016/j.wear.2011.10.001

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The microstructures and performance of Ni-WC (nickel-tungsten carbide) composite overlays deposited by plasma transferred arc welding are studied using a combination of microscopy, hardness, and wear testing. The Ni-WC overlays had microstructures consisting of gamma-Ni dendrites, with interdendritic Ni-based eutectics, borides and carbides. Overlays which were produced with a low hardness Ni-alloy matrix contained a smaller fraction of interdendritic phases relative to the high hardness Ni-alloys. The dissolution of WC particles was observed following deposition of the MMCs, and this promoted the formation of secondary carbide phases. Ni-alloys with low carbon and low Cr content exhibited the least dissolution of WC. The Ni-WC overlays produced using these dilute alloys generally performed better in ASTM G65 wear tests. This was due to the increased fraction of retained WC phase, and the reduced fraction of brittle secondary carbide phases when the Ni-alloy contained no Cr. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

引用

页码：345 / 354

页数：10

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