Prediction of long term creep data for forged 1Cr–1Mo–0·25V steel

Abstract Although a transition from transgranular to intergranular fracture occurs and the tempered bainite microstructure evolves during creep exposure, new relationships allow rationalisation and extrapolation of the multibatch creep data sets reported for 1Cr–1Mo–0·25V steel. Specifically, analyses of results from tests lasting only up to 5000 h accurately predict the minimum creep rates, the times to various strains and the creep lives for stress–temperature conditions causing failure in 100 000 h and more. Validation of this new methodology would therefore offer the prospect of cost effective acquisition of long term creep design data.