발간논문

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Vol.30, No.5, 487 ~ 495, 1992
Title
Behavior of Recrystallization of 1.8wt% ThO2 - W
안성욱Seong Uk An, 유정하Jeong Ha You, 최주Ju Choi
Abstract
Behavior of recrystallization of 1.8wt.% thoriated tungsten was studied compared with pure tungsten and 0.3wt.% NaCl-1.8wt.% ThO₂-tungsten. In the hardness test the pure and the alloyed tungstens showed almost the same start recrystallization temperature of 1400℃, but the hardness and recrystallization temperature of the thoriated tungstens were higher than those of the pure tungsten. The hardness of the alloyed tungsten decreased slowly from 470 to below 350 VHN with increasing temperature. This result of hardness tests was consistent with that of the microstructure observation : At 1400 ℃ the pure tungsten was already recrystallized about 40% in the specimen, but the alloyed was not recrystallized. Moreover the grain growth of the alloyed was inhibited in spite of temperature increase up to 2520℃.
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