Abstract
A Frequency modified total strain energy parameter for evaluating failure and crack initiation lives for Ni and Co base superalloys under strain controlled fatigue-creep interaction conditions was proposed in the author's previous paper. The parameter, obtained from the total tensile strain energy and loading time under tensile stress, effectively explained surface crack propagation behavior.
This paper examines the applicability of this parameter to predict the cyclic creep life and to evaluate the correlation between fatigue-creep interaction life and creep rupture strength. It was found that the strain controlled fatigue-creep interaction life, in addition to the cyclic creep life of René80 could be estimated by this parameter. Additionally, the creep rupture strength data were along the line of the best fit curve of strain controlled fatigue-creep interaction life data.
