遠隔操作によるEBSD及びTEM用試験片の調製技術開発

Development on preparation technique of small-sized irradiation test specimens by a remote-handling for EBSD and TEM observations

田口 剛俊 ; 加藤 佳明; 相沢 静男

Taguchi, Taketoshi; Kato, Yoshiaki; Sozawa, Shizuo

本報告は、軽水炉構造材の高経年化に伴う材料劣化,損傷に関する研究に資するためのJMTRホットラボセル内で行う照射材の切断,研磨,表面処理などから成る試験片調製に関するものである。照射誘起応力腐食割れ(IASCC)試験用の照射済みCT試験片及びSSRT(Slow strain rate tensile)試験片から電子線後方散乱回折(EBSD)観察用及びTEM観察用の2種類の試験片を採取し調製する技術が開発された。これらの試験片調製においては、き裂が進展した脆い部位の取扱い及び小形化等の遠隔操作では技術的な困難さを試行錯誤のうえに克服し的確な調製技術を確立した。

This report is concerned with the preparation of test-specimens for the post irradiation examination to contribute to the research on the aged deterioration and damage of the structure material of the light-water reactor, that consists of cutting, grinding, and the surface treatment of the irradiated material in the hot-cell at the JMTR Hot Laboratory. Two types of test-specimen preparation methods were developed for the electron beam backscatter diffraction (EBSD) observation and for the TEM observation. The specimens for those observations were sampled from fractions of the CT and the SSRT test specimens which were used in the irradiation-associated stress-corrosion cracking (IASCC) test. The technical difficulty in remote handling of the minimized specimens and of the fragile part where the crack progresses was overcome by a trial and error approach, and the adequate preparation technique for those tests was established.