A New Methodology for Long Term Creep Data Generation for Power Plant Components

Using stress rupture results openly available for Grade 91 steel, three features of a new methodology for creep data analysis are summarized. Firstly, in contrast to traditional power law and parametric methods, 100,000 h creep strengths of power plant steels are predicted accurately by extended extrapolation of creep lives from tests lasting a maximum of 5000 h. Secondly, related approaches rationalize creep ductility measurements in a manner which provides information relevant to creep damage evolution in operational plant. Finally, reference is made to a set of new relationships developed to offer a physically-meaningful foundation not only for rationalization and extrapolation but also for interpretation of the creep and creep fracture properties of metals and alloys.JRC.F.ADV01-Adviser for science strateg