| Title |
A Study on the Recrystallization Behavior of Mo - Hf - C Alloys by Plasma Arc Melting |
| Authors |
윤국한(Kook Han Yoon); 김형기(Hyeong Ki Kim); 이종무(Chong Mu Lee); 박원구(Won Koo Park); 최주(Ju Choi) |
| Abstract |
High temperature strength of heat resistant Mo-base allay such as TZM and TZC, was considerably improved due to the effect of TiC, ZrC precipitate hardening. Since HfC is much more stable than TiC and ZrC, development of HfC strengthened Mo-base alloy has already been under way. In this study, the Mo-Hf-C alloys containing 0.31∼1.14 at% Hf and 0.08∼1.00 at% C were prepared by plasma arc melting. The recrystallization behavior was examined upon the amounts of added Hf and C. The precipitates which influence the recrystallization behavior were analyzed by TEM observation. HfC precipitated when annealed sheet was heat treated below 1600℃. When the sample was heat treated above 1600℃, HfO₂ precipitated instead of HfC. As the contents of Hf and C increased, 50%-1hr recrystallization temperature increased from 1400℃ to 1700℃. |