Abstract
Creep-rupture tests were made at 566°C on 214Cr-1 Mo steel that had been decarburized in sodium or thermally aged in an inert atmosphere for 26 500 h. The rupture strengths (rupture life as a function of stress) for both conditions were below the average for the rupture strength of the annealed 214Cr-1 Mo steel. The difference was greatest for short rupture times. At long rupture times the rupture strengths of the aged and decarburized steels approached the minimum for annealed steel. This approach of properties could be explained by changes in microstructure that occur in 214Cr-1 Mo steel during elevated-temperature exposure.
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