PS44 クリープ破断寿命に及ぼすスモールパンチ・クリープ試験片の酸化被膜の影響(フェロー賞対象ポスターセッション)

概要

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Small Punch Creep (SPC) test has been recognized as a practical procedure to examine creep lives only sampling a veiy small volume. The size of SPC specimen is smaller than conventional uni-axial creep specimen, i.e., its volume ratio is about 1/300. However creep rupture life on the SPC test is affected by the evolution of oxide scale in the SPC specimen due to the small volume if the test is performed in air. In order to investigate effect of the oxide scale in SPC tests on creep rupture life, a series of SPC tests both in air and in vacuum were carried out at 600℃ employing 2.25Cr-1Mo Steel. Creep rupture life in air was shorter than the one in vacuum. Specimens after the test were scrutinized by SEM: Severe oxidation was confirmed on the specimen tested in air, but oxide scale rarely formed on the specimen tested in vacuum. Furthermore Finite Element analysis was performed to examine an effect of friction between the SPC specimen and a loading ball on the creep rupture life. It was revealed that the greater the friction coefficient was, the longer the creep rupture life became to be. However since the experiment showed contrary results, so further examination would be required.
一般社団法人日本機械学会の論文
2010-10-09