Application of Manson–Haferd and Larson–Miller Methods in Creep Rupture Property Evaluation of Heat-Resistant Steels

The current paper discusses the selection of Manson–Haferd and Larson–Miller constants on correlation results of creep rupture property in several heat-resistant steels. It indicates that the change in Larson–Miller constant $CLM$ has obvious effect on the predicting result of rupture life and the optimal $CLM$ values will depend on materials and the optimal ranges of the values are narrow. However, for Manson–Haferd constants $Ta$ and $logta$⁠, they are at least phenomenally not independent variables but show a linear relationship: $logta=27.015−0.0267Ta$⁠. It is shown that the values of Manson–Haferd constants $(Ta,logta)$ can be selected in a wide range with desirable correlation accuracy and a set of Manson–Haferd constant $(Ta=450,logta=15)$ is recommended to correlate the creep rupture data.