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Creep property measurement of service-exposed SUS 316 austenitic stainless steel by the small-punch creep-testing technique

Published online by Cambridge University Press:  31 January 2011

Maribel L. Saucedo-Muñoz ,
Shin-Ichi Komazaki ,
Toru Takahashi ,
Toshiyuki Hashida  and
Tetsuo Shoji
Maribel L. Saucedo-Muñoz*
Affiliation:
Fracture Research Institute, Faculty of Engineering, Tohoku University, Sendai 980–8579, Japan and Instituto Politecnico Nacional, ESIQIE, Apartado Postal 75–556, Mexico, D.F., 07300
Shin-Ichi Komazaki
Affiliation:
Materials Science and Engineering, Muroran Institute of Technology, 27–1 Mizumotocho, Muroran, Hokkaido 050–8585, Japan
Toru Takahashi
Affiliation:
Fracture Research Institute, Faculty of Engineering, Tohoku University, Sendai 980–8579, Japan
Toshiyuki Hashida
Affiliation:
Fracture Research Institute, Faculty of Engineering, Tohoku University, Sendai 980–8579, Japan
Tetsuo Shoji
Affiliation:
Fracture Research Institute, Faculty of Engineering, Tohoku University, Sendai 980–8579, Japan
*
a)Address all correspondence to this author.maribels@webtelmex.net.mx
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Abstract

The creep properties for SUS 316 HTB austenitic stainless steel were evaluated by using the small-punch creep test at 650 °C for loads of 234, 286, 338, 408, and 478 N and at 700 °C for loads of 199 and 234 N. The creep curves, determined by means of the small-punch creep test, were similar to those obtained from a conventional uniaxial creep test. That is, they exhibited clearly the three creep stages. The width of secondary creep stage and rupture time tr decreased with the increase in testing load level. The creep rupture strength for the service-exposed material was lower than that of the as-received material at high testing loads. However, the creep resistance behavior was opposite at relatively low load levels. This difference in creep resistance was explained on the basis of the difference in the creep deformation and microstructural evolution during tests. It was also found that the ratio between the load of small-punch creep test and the stress of uniaxial creep test was about 1 for having the same value of creep rupture life.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1945 - 1953
Copyright
Copyright © Materials Research Society 2002

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