抄録
Some destructive techniques are required to evaluate the degradation of components for thermal power plants. However, conventional uniaxial creep specimens were sometimes too large to collect a sample from local area of target components. Miniature Creep (MC) test that employs smaller size of the specimen can be collected from the local site is well known as a better semi-destructive testing technique. Although the MC specimen of round bar needed a sample of 4 mm in thickness, that of thin plate shape can be collected under 2 mm in thickness. In this study, MC tests using thin plate and round bar specimens were performed in Argon gas and in vacuum to evaluate their creep properties. Test results were compared with uniaxial ones employing 2.25Cr-1Mo steel. It was shown that creep rupture lives of the MC plate specimens in vacuum were a similar trend to those of uniaxial creep, and that the MC test using the thin plate is able to substitute for the conventional uniaxial creep test.
