Abstract
In heat resistant materials, the microstructural change occurs due to atomic diffusion and it affects directly to their mechanical properties. It is known that the state of this microstructural change can be represented by the system free energy, and therefore evaluation of this free energy is useful for the damage analysis of the materials. In this study, change in the system free energy of FG-HAZ in 9Cr heat resistant ferritic steels was estimated with creep time on the basis of a series of experiments. As a result, it was found that system free energy decreased with creep time and the decreasing rate was accelerated by applied stress. The change in the system free energy expressed as a function of applied stress makes it possible for, the microstructural state of the steel to predict an arbitrary creep condition.
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