超音波横波の速度異方性による純鋼のクリープ損傷評価

概要

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An ultrasonic experiment has been carried out to evaluate the accumulative creep damage which occurred in polycrystalline pure copper during high-temperature tensile loading. The shear wave velosities exhidited birefringence which arose from the macroscopic anisotropy due to intergranular creeping process controlled by grain-boundary cavitaion and subsequent microcracking perpendicular to the stress axis. The velocity anisottropy which is independent of specimen thckness, decreased very slowly and linearly up to approximately 80% of the time to fracture, and then decreased at increasing rate untill the eventual failure. The first period was expended by the uncleation and growth of cavities and the corresponded to the cavity coalescence and the cracking. Measurements of porosity and metallography supported the ultrasonic observation. The results gave basic information about nondestructive characterrzation of accumulative creep damage in higt-temperature components.
社団法人日本材料学会の論文
1990-07-15