Abstract
A large number of fossil power plants have already been operated beyond the design life of 100000 hours in Japan. It is therefore very important to predict residual life of materials used in boiler and to prolong the service life of boiler plant. In order to predict the residual life of materials used in boiler, several non-destructive life assessing techniques based on metallographical examination using replica were developed and applied to the life assessment of actual boiler plants.For the purpose of improving the accuracy of the present life assessing techniques, a new non-destructive evaluation technique was developed based on a quantitative analysis of microstructure. The results obtained are following.(1) The creep rupture strength is reduced by thermal aging. In order to evaluate damage by thermal aging, a quantitative analysis of microstructure using an image analyzer was performed and an area fraction of dark parts of microstructural image was selected as an appropriate parameter for aging evaluation.(2) This evaluation technique based on a quantitative analysis of microstructure can be applied to the synthetic evaluation which was developed in our previous study. Also, using this technique, there is a possibility that creep damage is estimated directly from microstructure.
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