ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

Development of Small Punch Tests for Creep Property Measurement of Tungsten-Alloyed 9%Cr Ferritic Steels

Komazai, S
Research associate, Akita Prefectural University, Akita,

Hashida, T
Professor, Tohoku University, Sendai,

Shoji, T
Directorprofessor, Tohoku University, Sendai,

Suzuki, K
Engineer, Tohoku Electric Power Co., Inc., Sendai,

(Received 12 October 1999; accepted 7 April 2000)

Abstract

A small punch creep (SP-C) testing technique using miniaturized specimens has been demonstrated for evaluating creep properties and material deterioration due to thermal aging. This technique has been applied to tungsten-alloyed 9%Cr ferritic steels. Experimental results revealed that the overall shapes of the creep curves obtained from the SP-C tests were qualitatively similar to those obtained from conventional uniaxial creep tests and reflected closely the degradation of creep rupture strength of the materials. A correlation with uniaxial creep was also determined in terms of stress (load) exponent and apparent activation energy for creep deformation. The correlation suggests that the SP-C testing technique may provide a useful tool for evaluating degradation of creep properties for structural components in-service.

Keywords:
small punch creep testing technique, creep, material deterioration, tungsten alloyed 9%Cr ferritic steels, stress (load) exponent, apparent activation energy, uniaxial creep test

Paper ID: JTE12102J
DOI: 10.1520/JTE12102J
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