蒸気タービン車室の経年ぜい化の非破壊評価法

概要

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In order to develop a nondestructive method of evaluating embrittlement for turbine casing steels, a study was conducted using lab-charged P-doped steels. P-doped steels showed evident embrittlement due to segregation of P at grain boundaries. The chemical etching test used was found to be a very good measure of embrittlement for casing steels. There was a good correlation between the width W of the etched grain boundary measured by the penetration of replicas and FATT. The correlation between W and FATT was also recognized for the samples taken from long-term-serveced casings. Multiple regression analysis was conducted in order to express FATT using W and other variables which are known or nondestructively measurable. The regression equation obtained gave an estimate of actual FATT with the scatter of ±20℃. On the basis of this result a nondestructive evaluation method of temper embrittlement for turbine casing is proposed.
社団法人日本材料学会の論文
1993-04-15