18.97.14.83
18.97.14.83
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SCIE SCOPUS
몰리브덴 판재의 두께 방향에서 CaO , MgO 의 조성차가 재결정과 결정립성장에 미치는 영향
Effect of Chemistry Gradient of CaO and MgO on recrystallization and Grain Growth in Thickness Direction of Molybdenum Sheet
유명기(Myoung Ki Yoo), 평강 유(Yutaka Hiraoka), 최주(Ju Choi)
UCI I410-ECN-0102-2008-580-001843066

Preparation of double-layered grain structure was stuided in molybdenum (Mo) sheet. Mo powder doped with CaO and MgO (D-layer) and pure Mo powder (P-layer) were compacted at 300MPa in sequence of P-D-P and D-P-D. The compacts were sintered at 1850℃ and straight rolled by 70% reduction in thickness. Microstructures in thickness direction were observed by optical, scanning electron and transmission electron microscopies. Pole intensities were also calculated for a specific [hkl] orientation. To understand the role of dopants, i.e, CaO and MgO during annealing, P-D-P and D-P-D specimens were annealed at 1200℃ for 10hrs, at 1776℃ for 2hrs and at 1950℃ for 2hr under hydrogen atmosphere. D-layers at the surface of D-P-D specimen revealed smaller grain size than D-layer at the center of P-D-P specimen in the range of primary recrystallization (l200℃), At 1776℃, both P-D-P and D-P-D specimens showed secondary recrystallization phenomenon from the surface of specimen, At 1950℃, double-layered grain structure developed in D-P-D specimen while coarse grains formed in P-D-P specimen.

[자료제공 : 네이버학술정보]
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