An electron microscope study of changes in a 2 1/4% Cr, 1% Mo super-heater tube steel during tempering and creep
Present day power plants require materials that can withstand stresses at elevated temperatures for times of the order of 100,000 hr. Naturally it would be highly desirable to predict the behaviour of these materials over long periods from tests of short duration. If the view is correct that creep strength is largely determined by the fine-scale microstructure this would be possible if similar changes take place at different temperatures. The present work was done in an attempt to test this hypothesis, changes in microstructure in fairly long tests at service temperatures being compared with those occurring during shorter tests at higher temperatures. It was considered that the application of electron microscopy might make such short duration tests feasible.
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