Abstract
Creep-fatigue test was conducted for a ferritic heat-resisting steel that contained 12mass%chromium and 2mass% tungsten. The creep-fatigue fracture originated from prior austenite grain boundaries. Subgrains neighboring the prior austenite grain boundaries became coarse during creep-fatigue testing. Nano-indentation tests were performed on the coarse subgrains neighboring grain boundaries and finer subgrains inner grains. As the results, the nano scale-hardness of the coarse subgrains were markedly lower than those of the finer subgrains inner grains. Therefore, it is suggested that the coarse subgrains neighboring grain boundaries play an important role of creep-fatigue fracture mechanism.
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