| 摘要 |
PROBLEM TO BE SOLVED: To evaluate creep damage rate and obtain a life and a remaining life time by using physical quantity measured nondestructively in high-temperature equipment, such as a boiler being in service. SOLUTION: A high-temperature creep damage mechanism generates void, connection, and crack development by stress load caused by deposits, such as carbide being generated by a change in organization, thus leading to a break. The amount of AC magnetization measurement in creep contains an amount of change caused by a structural change by thermal aging and caused by damage accompanying stress load. Creep damage progresses by the stress load with the change in organization as a trigger, so that an amount corresponding to the direct damage evaluation is the amount of damage accompanying the stress load. The amount of change by thermal aging is excluded from the amount of measurement at high-temperature creep, an amount corresponding to damage accompanying the stress load is defined as the amount of stress governing type damage for extraction and evaluation. COPYRIGHT: (C)2004,JPO
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