Evaluation of Sensitivity to Irradiation Assisted Stress Corrosion Crackingby Measurement of Leakage Magnetic Flux Density
高屋 茂 Shigeru TAKAYA 根本 義之 Yoshiyuki NEMOTO 内一 哲哉 Tetsuya UCHIMOTO 欅田 理 Satoshi KEYAKIDA
Austenite Stainless SteelFirst Principle CalculationFlux Gate SensorIASCCLeakage Magnetic Flux DensityMaterial DeteriorationNondestructive Evaluation
In a previous study, authors showed experimentally the correlation between leakage magnetic flux density and irradiation assisted stress corrosion cracking susceptibility of high purity model austenitic stainless ste els. This study aimed to investigate mechanism of the correlation. Tensile test at elevated temperature and aging test were conducted on materials simulating irradiation-induced segregation, and leakage magnetic flux density was measured before and after these tests in order to study the influence of chemical composition change and lattice defect to leakage magnetic flux density. Furthermore, dependency of magnetic moment on lat tice constant was evaluated by first principle calculation. As result, it was shown that leakage magnetic flux density of irradiated materials is thought to increase in severe irradiation-induced segregation region.