中性子残留応力測定法を用いた実機経年化溶接継手および補修溶接継手の健全性評価に関する基礎的検討
Basic investigation of aging weld joint and repair weld joint integrity assessmentusing neutron residual stress measurement method
著者:
小原 智史 Satoshi OBARA 高屋 茂 Shigeru TAKAYA 若井 隆純 Takashi WAKAI 浅山 泰 Tai ASAYAMA 鈴木 裕士 Hiroshi SUZUKI 齊藤 徹 Toru SAITOH
発刊日:
公開日:
Aged Welded JointAustenitic SteelHardnessHigh TemperatureLong ServiceMicro StructureRepaired Welded JointResidual stress
概要
For the commercialization of fast breeder reactors (FBR), it is essential to enhance the economic competitiveness by reduction of total cost by elongation of plant service period. For this reason, it is needed to establish the aged weld joint integrity assessment method for future FBR compon ents. Additionally, since it is expected to employ the repair weld for aged structural components, it is essential to investigate the effect of repair weld. To investigate the influence of high temperature-long service on weld joint, it is examined using microscopy, residual stress analysis (RESA and RESA-II) and hardness tester. In addition, similar examinations are also conducted for repair weld joint to investigate the effect of repair weld. As the results, micro structures and residual stress are varying from under the high temperature-long service environment, and also var ied by repair weld. And micro structures and residual stress are correlated with hardness of repair weld joint. Since some creep tests of aged and repaired welded joints are continued, the long term stability of micro structure and mechanical properties need to be investigated in the future.
