画像処理技術を用いたボイド面積率評価の高精度化に関する検討

抄録

For life extension of fossil power plants, one of the most important subjects is to evaluate creep damage in high-temperature components such as boilers and turbines. A creep void area fraction rate method, by which damage is evaluated based on visible information from a material texture image, is a useful method with applicability to damage detection in actual plants. In this study, an evaluation system for creep void area fraction rate assisted by an image-processing technique was newly developed. It was ascertained that the developed system enabled efficient and objective evaluation with the same accuracy as the conventional manual method. Statistical properties of creep void distribution were studied using data acquired with the system. The relation between measurement conditions and evaluation accuracy was examined, and reasonable measurement conditions were proposed.