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Inconel 617의 고온열화에 따른 미세구조 및 고온 기계적 특성
조태선,이승호,김길수,김세훈,김영도,Jo, Tae-Sun,Lee, Seung-Ho,Kim, Gil-Su,Kim, Se-Hoon,Kim, Young-Do 한국재료학회 2007 한국재료학회지 Vol.17 No.5
Inconel 617 is a candidate tube material for high temperature gas-cooled reactors(HTGR). The microstructure and mechanical properties of Inconel 617 were studied after exposure at high temperature($1050^{\circ}C$). The dominant oxide layer was Cr-oxide. The internal oxide and Cr-depleted region were observed below the Cr-oxide layer. The depth of Cr-depleted zone and internal oxide increased with exposure time. The major phases of carbides are $M_{23}C_6\;and\;M_6C$. The composition of $M_{23}C_6\;and\;M_6C$ were determined to be Cr-rich and Mo-rich, respectively. $M_6C$ carbide is more stable than $M_{23}C_6$ at high temperature. From the results of high temperature compression test, there were no significant changes in hardness and yield strength upon increasing exposure time.
Hastelloy X의 고온열화에 따른 미세구조 및 고온압축특성
김길수,조태선,서영익,류우석,김영도,Kim, Gil-Su,Jo, Tae-Sun,Seo, Young-Ik,Ryu, Woo-Seog,Kim, Young-Do 한국재료학회 2006 한국재료학회지 Vol.16 No.5
Short-term high temperature degradation test was conducted on Hastelloy X, a candidate tube material for high temperature gas-cooled reactors (HTGR), to evaluate the variation of microstructure and mechanical property in air at $1050^{\circ}C$ during 2000 h. The dominant oxide layer was Cr-oxide and a very shallow Cr-depleted region was observed below the oxide layer. At the beginning of degradation, the island shape $M_6C$ precipitate (M=Mo-rich, Fe, Ni, Cr) was observed in matrix region. After 2000 h degradation, precipitate shape was changed to the chain shape and increased amount of precipitate. These results influenced mechanical property of the specimen which exposed in high temperature. Yield strength was decreased from 115MPa to 89 MPa after 24 h and 2000 h exposure, respectively.
김세훈,조태선,박민서,김영도,Kim, Se-Hoon,Jo, Tae-Sun,Park, Min-Suh,Kim, Young-Do 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.5
In recent years, a rapid increase in demands for the soft magnetic composite parts has been created and it has been tried to improve their properties by various processing methods, alloying elements and compaction parameters. Warm compaction method has been used for the reduction of residual stress, the improvement of magnetic properties and the higher densities. In this work, the effects of warm compaction and polymer binder on magnetic properties of Fe powder core were investigated. The sintering powder, Fe oxide, was ball-milled for 30n hours. And then ball-milled Fe oxide powder was reduced through hydrogen reduction process. The hydrogen reduced Fe powder and polymer binder were mixed by 3-D turbular mixer. And then the mixed powder was warm-compacted. The magnetic properties such as core loss and permeability were measured by B-H curve analyzer.
재결정에 따른 Alloy 617의 고온 산화 거동 및 기계적 특성
임정훈 ( Jeong Hun Lim ),조태선 ( Tae Sun Jo ),박지연 ( Ji Yeon Park ),김영도 ( Young Do Kim ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.12
In this study, high temperature oxidation behavior of Alloy 617 was investigated to evaluate the effect of grain size for Alloy 617. The grain size of grain-refined Alloy 617 (GR617) was reduced to 5 μm from 71 μm for as-received Alloy 617 (AR617) by recrystallization after cold rolling. After high temperature aging, the oxide layers of AR617 and GR617 consisted of Cr2O3 external oxide scale and Al2O3 internal oxide. The external oxide scale resulted in a Cr-depleted zone and a carbide free zone below the scale. The depth of the carbide free zone was deeply formed in GR617. On the other hand, the depth of the internal oxide layer in GR617 was shorter than that in AR617. After a 3-point bending test, crack propagation of GR617 was more restricted than that of AR617 because of the different microstructure of the internal oxide.
MoO3 분말의 수소환원을 통한 CIGS계 후면 전극용 Mo 박막제조
김영도 ( Young Do Kim ),김세훈 ( Se Hoon Kim ),조태선 ( Tae Sun Jo ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.2
In order to obtain a suitable back contacting electrode for Cu(InGa)Se2-based photovoltaic devices, a molybdenum thin film was deposited using a chemical vapor transport (CVT) during the hydrogen reduction of MoO3 powder. A MoO2 thin film was successfully deposited on substrates by using the CVT of volatile MoO3(OH)2 at 550℃ for 60 min in a H2 atmosphere. The Mo thin film was obtained by reduction of MoO2 at 650℃ in a H2 atmosphere. The Mo thin film on the substrate presented a low sheet resistance of approximately 1 Ω/sq.