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 15CrMo G 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 thehigh-temperature creep behaviour of the 15CrMoG steel.
展开▼
