High Temperature Strength. Long-Term Stress Relaxation Properties of NCF 800H Alloy

Autor:	Osamu Kanemaru, Koichi Yagi, Chiaki Tanaka, Toshio Ohba
Rok vydání:	1997
Předmět:	Materials science Precipitation (chemistry) Mechanical Engineering Alloy Metallurgy engineering.material Condensed Matter Physics Carbide Creep Mechanics of Materials Residual stress Long term stress engineering Stress relaxation Relaxation (physics) General Materials Science Composite material
Zdroj:	Journal of the Society of Materials Science, Japan. 46:19-24
ISSN:	1880-7488 0514-5163
DOI:	10.2472/jsms.46.19
Popis:	Long-term stress relaxation behavior was investigated on NCF 800H alloy. Complicated stress relaxation curves such as those with rapid decrease or increase in residual stress were observed. Their relationship between stress relaxation behavior and microstructural change was examined. The rapid decrease in residual stress was caused by the reduction of creep deformation resistance due to coarsening of carbides. Minus relaxation behavior which expresses the increase in residual stress was related to the shrinking of testing material due to precipitation of carbides. Therefore, it is difficult to extrapolate the long-term stress relaxation curve from the result of short-term tests, and the long-term stress relaxation value should be predicted using the aged material.
Databáze:	OpenAIRE
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