Comparison of Chromia Growth Kinetics in a Ni-based Superalloy, with and without Shot-peening

被引：33

作者：

Cruchley, S. ^{[1
]}

Taylor, M. P. ^{[1
]}

Ding, R. ^{[1
]}

Evans, H. E. ^{[1
]}

Child, D. J. ^{[2
]}

Hardy, M. C. ^{[2
]}

机构：

[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Rolls Royce PLC, Derby DE24 8BJ, England

来源：

CORROSION SCIENCE | 2015年 / 100卷

基金：

英国工程与自然科学研究理事会;

关键词：

Superalloys; Oxidation; Selective oxidation; NICKEL-BASED SUPERALLOY; OXIDATION BEHAVIOR; ALLOY; MECHANISM; DAMAGE;

D O I：

10.1016/j.corsci.2015.07.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of shot-peening on the oxidation in air of the Ni-based superalloy RR1000 has been investigated over the temperature range 700-800 degrees C. The surface oxide in both peened and un-peened conditions consisted of isolated grains of rutile on the outermost surface beneath which was a protective Ti-doped chromia scale. Internal oxidation of aluminium occurred within the alloy with the formation of alumina particles within a gamma' (nominally Ni-3(Al,Ti)) denuded zone but the morphology of the sub-surface oxides differed between the two surface conditions examined. The kinetics of thickening of the chromia layer were sub-parabolic in most cases but closely approached parabolic behaviour for the un-peened surface condition at 800 degrees C. An enhancement in the rate of chromia growth was found for both surface conditions compared with a Ti-free chromia layer. This enhancement has been attributed to increased Cr ion diffusion as a result of Ti-doping of the chromia layer but the effect is reduced over time because of Ti-depletion in the alloy. At 800 degrees C, in the un-peened condition, the reduction in growth rate with exposure time is much less marked and this effect seems to be associated with the formation of a (Ti,Ta)O-2 phase beneath the chromia layer. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：242 / 252

页数：11

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