微小パンチ試験による長時間使用CrMoVロータの衝撃特性の推定

概要

論文の詳細を見る
By means of a small punch test technique, the possibility of evaluating embitterment in the HP -IP steam turbine CrMoV rotors used in service for a long time was investigated. It was found that for the 5 % NiCrMoV steel specimens subjected to various aging time, or various degrees of temper embitterment, the SP energy of the small punch test at -196℃ corresponds to the extent of embitterment, especially the 50 % FATT. By adopting this technique to the CrMoV rotors in service, it was recognized that their 50 % FATT and Charpy energy at 100℃ can be estimated from the SP energy at -196℃. The cause of embitterment, especially temper embitterment, can be determined from the observation of fracture surface of the small punch test specimens at - 196℃ by SEM. The results obtained suggest a possibility to estimate the extent of embitterment of HP-IP CrMoV rotors in service by a quasi-non-destructive method.
社団法人日本材料学会の論文
1988-10-15