Tribological behavior of Stellite 21 modified with yttrium

被引:58
作者
Radu, I [1 ]
Li, DY
Llewellyn, R
机构
[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada
[2] CNR, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
关键词
yttrium; stellite; 21; high-temperature wear; oxide; nano-indentation; micro-scratch;
D O I
10.1016/j.wear.2004.07.013
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Cobalt-base alloys have found a wide variety of tribological applications particularly at elevated temperatures or in corrosive environments in many industries, such as aerospace, automotive, power and gas turbines. One of the standard Co-base alloys, Stellite 21, is used predominantly to resist the synergistic effects of corrosion and mechanical attack, especially at elevated temperatures and continuing efforts have been made to improve its properties. One approach is to add reactive elements, such as yttrium, in order to beneficially affect its oxidation behavior. Research was conducted to investigate the effects of Y additions on Stellite 21 on its microstructure, mechanical behavior, and high-temperature wear performance. These studies employed various experimental tools, such as micro-mechanical probe, XRD, SEM, EDS, and high-temperature tribometer. The effects of Y addition on the properties of the oxide film formed on Stellite 21 were also investigated using grazing XRD and nano-mechanical probing techniques. It has been demonstrated that Y additions benefited the wear behavior of Stellite 21, especially at elevated temperatures. The oxide scale developed at 600degreesC also showed markedly enhanced mechanical properties when Y was alloyed to the alloy. (C) 2004 Elsevier B.V. All rights reserved.
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页码:1154 / 1166
页数:13
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