Alumina scale failure resulting from stress relaxation

被引：49

作者：

Tolpygo, VK ^{[1
]}

Clarke, DR ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Coll Engn, Santa Barbara, CA 93106 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 1999年 / 120卷

关键词：

alumina scale failure; stress relaxation;

D O I：

10.1016/S0257-8972(99)00331-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Relaxation of the stresses, produced by high-temperature oxidation, is analyzed in terms of its influence on the morphology and spalling resistance of the alumina scales on Fe-Cr-Al heat-resistant alloys. Despite a general belief that stress relaxation is a beneficial factor in oxide adherence, several types of scale failure are shown to occur as a direct result of stress relaxation. These failure modes include: cracking of the alumina scale under thermally induced tension during re-heating; "sub-critical" buckling and spalling during cooling; and spalling promoted by stress-driven morphological changes in the scale. The importance of the rate of temperature change, the substrate compliance, and the oxide-metal interface morphology is emphasized. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：1 / 7

页数：7

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