Abstract
Rapid increase in power plant efficiency requires development of heat-resistant steels for use in the boiler and piping systems. In this study, the creep activation energy of 15CrMoG steel was first investigated on the basis of the relationship between creep rate and temperature subjected to different stresses. Long-time creep tests at selected temperatures were performed for the 15CrMoG steel. Manson-Haferd model was utilized to predict the creep behavior of the steel, the results of which indicate that the experimental creep data agreed well with the data from the Manson-Haferd model prediction. Besides, the strain vs. creep time curves obtained from the creep tests were in good accordance with theoretical calculation based on the CDM model over a long creep time. Both Manson-Haferd model and CDM model are powerful tools in studying the high-temperature creep behaviour of the 15CrMoG steel.
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