作者：MITSUO SUGAWARA;HIROYUKI MIYAMOTO;YUSUKE URITA;

作者单位：Technical Research Laboratory, Krosaki-Harima Corp. 1-1 Higashihama-machi, Yahatanishi-ku, Kitakyushu 806-8586, Japan

刊名：Taikabutsu Overseas

ISSN：0285-0028

出版年：2002-01-05

卷：22

期：3

起页：187

止页：192

分类号：TQ175

语种：英文

关键词：

内容简介

In the design analysis of refractory materials, it is necessary for the analyst to know thoroughly their behaviors resulting from inhomogenieties and permanent nonlinearities before establishing an appropriate methodology for prediction. Alumina-magnesia castables, in which spinel-forming reaction occurs during the service, exhibit complicated material behaviors attributed to the expansion accompanying spinel formation, elastoplasticity, and creep. In this report, the creep coefficients associated with the Norton-Baily relation were determined by a uniaxial compression creep test at various temperatures. Those coefficients were used in the creep analysis of a ladle lining subjected to a thermal shock cycle that simulates operational conditions. The finite element analysis was used to account for the effects of creep and the spinel-forming reaction occurring during the thermal hysteresis. The analysis showed that the expansion accompanying spine formation exerts compressive stress on the hot face of the lining as it undergoes thermal cycles. This compressive stress is subsequently relaxed by emerging creep strain. There exists a thin layer lying between 40 and 70 mm from the hot face where the stress rapidly changes with distance. Those rapid stress changes can cause microcracks, which may accumulate and grow under cyclic thermal loading and eventually result in the delamination of the ladle lining. The results of the present analysis ascertained its reliability and relevance as a tool to shed light on the delamination mechanism.