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전자현미경 In-Situ 관찰방법을 이용한 황동의 절삭성평가
정승부,임옥동,안성욱,Jung, Seung-Boo,Lim, Ok-Dong,An, Seong-Uk 한국현미경학회 1994 Applied microscopy Vol.24 No.3
In order to elucidate the machinability of lead brass, orthogonal machining experiment was conducted in SEM(Scanning Electron Microscope) equipped with a micro-machining device at a cutting speed of $7{\mu}m/s$ for brass containing 0.2 to 3wt% Pb. The microfactors (i.e., shear angle, contact length between chip and tool) were determined by in-situ observations. Machinability of brass containing lead is discussed in terms of the microfactors and the cutting resistant force tested by lathe cutting. The dynamic behavior of the chip formation of lead brass during the machining process was examined: The chips of lead brass form as a shear angle type. The shear angle increases with the content of lead in (6:4) brass. The pronounced effect of lead on the contact length between chip and tool was observed above 1% Pb. The cutting resistant force tested by lathe decreases remarkably with the lead content in brass. The observed microfactors are in close relation to the tested resistant force in macromachining.
안성욱,김수철,임옥동,서동이,배영일,허무영,An, Seong-Uk,Kim, Soo-Chul,Lim, Ok-Dong,Seo, Dong-Yi,Larionov, V.,Bae, Young-Il,Huh, Moo-Young 한국재료학회 1996 한국재료학회지 Vol.6 No.9
가스터빈용 단결정 주조 블레이드는 기포 및 Freckle등과 같은 주조결함이 없어야 하며, 수지상, ${\gamma}$'크기와 모양에 따라 화학조성이 다르며, 기지와 공정조직을 각각 2영역 및 3영역으로 분류할 수 있었다. 또한, Ti는 첨가원소호서 조직제어에 매우 중요한 역할을 하였다.
Ni기 초합금 B1914의 다결정, 방향성 및 단결정 주조구조에 따른 고온 인장 특성 연구
안성욱,장용석,윤동한,임옥동,진영훈,이재훈,서동이,오제명,이상준,임대순,An, Seong-Uk,Jang,Yong-Seok,Yun, Dong-Han,Im, Ok-Dong,Larionov, V.,Grafas, I.,Jin, Yeong-Hun,Lee, Jae-Hun,Seo, Dong-Lee,O, Je-Myeong,Lee, Sang-Jun,Lim, Dae-Soon 한국재료학회 1998 한국재료학회지 Vol.8 No.9
Ni기 초합금인 B1914로 다결정, 방향성 및 단결정을 제조하여, 상온과 고온에서 이들 결정종류에 따른 변형을 관찰하였다. 이들 결정을 제작하기 위하여 진공 주조로에서 냉각속도와 온도구배를 제어하였으며, 제작된 봉상 시편들은 2단계의 진공열처리를 하고 아르곤가스로 급냉하였다. 동일한 모합금인 B1914로 제조된 결정들은 결정종류에 따라서 뚜렷한 변형(stress-strain)을 나타내었다. 즉, 항복강도와 인장강도는 다결정, 방향성 및 단결정 순으로 뚜렷이 증가하였다. 또한 $600^{\circ}C$에서 모든 결정들은 $\gamma$'의 강화효과로 인해서 가장 높은 741-816MPa의 항복강도를 나타내었으며, 인장강도는 1005-1139MPa이었다. The B1914 Ni-base superalloy was manufactured according to crystal structures of poly-, directionally solidified- and single crystals. We observe deformation as type of different crystal structure from room to high temperature. Specimens are controled by cooling rate and thermal gradient and then heat treatment in vacuum and then cooling with Ar gas. Different crystal structure has different stress-strain characteristic. At $600^{\circ}C$, yield strength and ultimate strength is increased single-, directionally solidified- and poly crystals in order.
핫프레스포밍 공정에서 내산화 코팅처리가 TWB 용접부 특성에 미치는 영향
김상권 ( Sang Gweon Kim ),임옥동 ( Ok Dong Lim ),이재훈 ( Jae Hoon Lee ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.6
In order to increase the anti-oxidation property during the tailor welding blanked hot press forming pro-cess for a high strength boron steel sheet we performed a different coating method on the boron-steel sheet such as 87% Al-13% Si and fe-8.87 Zn dipping plating procedure However during laser welding process the Al-Si coated steel sheet has showed a low tensile strength and about half value of elongation than the original boron-steel sheet. Aluminum and silicon elements of coating layer were diffused into the boron-steel matrix and have shown a low strength result than non-coated specimen. On the other hand Zinc-coated boron-steel has expectedly showed a excellent tensile strength and micro-harness value in the welded area like original boron-steel. (Received September 3, 2012; Recvised September 20, 2012; Accepted October 13, 2012)
니켈계 초내열 단결정 주조 합금의 고온압축변형에 따른 미세조직변화 연구
최종수,허무영,안성욱,진영훈,임옥동,서동이 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.1
Nickel-based single crystal superalloy shows directional coarsening which has been explained by the interaction of interface dislocation and composition in matrix. After compression test at 700, 800℃ and 900℃, γ' precipitates were observed on (001) and (010) planes through scanning and transmission electron microscopes. Strains of γmatrix and γ' precipitate were measured using XRD. (010)plane exhibited the increasing tendency of directional coarsening of γ precipitate with increasing temperature. Due to the interaction of dislocation and Cr, Co diffused into matrix channel perpendicular to stress axis. γ' precipitates were sheared by dislocations along the direction parallel to stress axis and showed faster rate of strain with increasing temperature compared to γmatrix, which was never seen at low stress state such as in creep test. So it was concluded that stress intensity and temperature affected microstructure of γ' precipitates.