Abstract
A damage model based on micro mechanics was developed in order to assess creep-fatigue interaction in Modified 9Cr-1 Mo steel. The model assumes the following damage processes for each loading. The fatigue life consists of two stages ; damage initiation life and its growth life. On the other hand, creep life is a process of damage initiation only. In the case of creep-fatigue loading, the damage is initiated by creep loading and grows with the fatigue loading. It was shown that the damage model could accurately predict creep-fatigue life of Mod. 9Cr-1 Mo steel under complicated loading histories.
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