予クリープ変形を受けたフェライト系ステンレス鋼のスモールパンチクリープ試験による累積クリープ損傷評価

抄録

Small Punch (SP) Creep test has been recognized as a practical procedure to examine creep lives only sampling a very small volume. The SP creep test enables assessment of local points that conventional uniaxial creep test cannot evaluate. In order to assess the applicability of cumulative damage rule using the time fraction rule, a series of SP creep tests were carried out in air at 700°C employing ferritic stainless steel. Experimental test results show that the time fraction rule could be applied for the residual life of slighter pre-damaged specimens. However it would overestimate the severely damaged specimens.