Extrapolation of creep life data for 1Cr-0.5Mo steel

摘要

A new approach to analysis of stress rupture data allows rationalization, extrapolation and interpretation of multi-batch creep life measurements reported for ferritic 1Cr-0.5Mo tube steel. Specifically, after normalizing the applied stress through the appropriate UTS value, the property sets at various creep temperatures are superimposed onto a sigmoidal 'master curve' using the activation energy for lattice diffusion in the alloy steel matrix (300kJmol{sup}(-1)). Despite the considerable batch-to-batch scatter, results from tests lasting less than 30,000 h then allow straightforward prediction of creep lives for stress-temperature conditions causing failure in times up to 150,000 h.