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EVALUATION TECHNIQUE FOR CREEP LIFE BY MAXIMUM VOID GRAIN BOUNDARY OCCUPATION RATE METHOD
EVALUATION TECHNIQUE FOR CREEP LIFE BY MAXIMUM VOID GRAIN BOUNDARY OCCUPATION RATE METHOD
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机译：最大空粒子边界占有率法的蠕变寿命评估技术
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摘要
PROBLEM TO BE SOLVED: To obtain an evaluation technique in which a creep life consumption rate can be evaluated with high accuracy even by an unskilled operator, by a method wherein the maximum value of the grain boundary occupation rate of a creep void generated in every crystal grain boundary of a member is measured and the creep life consumption rate of a creep-degraded apparatus member is estimated. SOLUTION: A part in which a creep void is recognized is observed at an arbitrary magnification by using a scanning electron microscope, an optical microscope or a laser microscope, and the maximum part of a creep void crystal grain boundary occupation rate within its visual field is measured. The maximum part is fitted to a master curve obtained by an experiment, and the creep life consumption rate of a member is estimated. For example, the ratio of the length l of a creep void on a crystal grain boundary occupied by the length L of a crystal grain boundary in which the creep void exists is calculated, and a maximum void grain boundary occupation rate is found. When the maximum void grain occupation rate is fitted to a master curve obtained by an experiment, the creep life consumption rate of the member to be evaluated can be evaluated, and the consumption rate can be measured every simply even by an unskilled operator.
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