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- 저자 : 조중욱 ( Jung Wook Cho ) (검색결과 5 건)
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심상철 ( Sang Chul Shim ),조중욱 ( Jung Wook Cho ),황상택 ( Sang Taek Hwang ),김광천 ( Kwang Chun Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.10
The behavior of hydrogen in the steel making process was investigated. The relation between the composition of ladle slag and hydrogen concentration in molten steel was considered. The hydrogen distribution ratio between ladle slag and molten steel was increased with increasing basicity of the slag; it was about 20 when the basicity of slag was 15. Hydroxyl capacity measured from the hydrogen distribution ratio between slag and the molten steel was comparatively corresponding to the value of hydroxyl capacity measured by the equilibrium reaction of slag and H2O gas. However, it is considerably different from the value calculated by regular solution model. The influence of hydrogen on a sticking type breakout is considered. The effect of hydrogen and H2O gas on the crystallization behavior of mold powder was investigated by DHTT(Dual hot thermocouple technique). As a result, it was proved that mold powder could be crystallized by H2O gas in the atmosphere. Therefore, it is concluded that H2O gas in the atmosphere can be a possible cause of the sticking type breakout that occasionally occurs in the continuous casting process.
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Selective Laser Melting (SLM) 방식 3D Printing으로 제조한 스테인레스 316L 기계적 물성 분석
박순홍(Sun Hong Park),장진영(Jin Young Jang),노용오(Yong Oh Noh),배병현(Byung Hyun Bae),이병호(Byong Ho Rhee),어두림(Du Rim Eo),조중욱(Jung Wook Cho) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
금속 소재부품의 제조 형태가 복잡해지고 소비자의 요구가 다양함에 따라 금속 3D 프린팅 연구가 활발히 진행되고 있다. 본 연구에서는 우주 발사체의 엔진 연소 노즐 부품에 적용 가능한 스테인레스 316L계 금속을 3D 프린팅 방식으로 제조하고 이에 대한 기계적, 화학적 특성 상관 연구를 진행하였다. 금속 3D 프린팅 기술은 레이저원을 이용하여 분말을 급속 용융과 응고를 반복됨에 따라 기존의 주조 응고와는 다른 미세 조직 형태를 나타내고, 이에 따라 기계적 물성이 변화함을 관찰하였다. 특히 개재물의 존재에 따라 기계적 특성이 변화하고 공정 조건의 변화에 따라 기공의 형태 및 위치등이 변화하는 것을 확인하였다. Laser Based 3D Printing is an recently advance manufacturing technology for making complex shape comopnent such as automobile and aerospace. So in this article, stainless steel 316L was manufactured by Selective Laser Melting (SLM) and Laser Melting Deposition (LMD) method. SLM is an additive manufacturing process that allow for the manufacture of small and complex component by laser melting and solidification of powder in bed using a high intensity laser beam. The results showed that the laser scanning speed and laser power affects the defect, microstructure and the hardness of the components.
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Hot Thermocouple법을 이용한 몰드플럭스의 결정화거동 평가
조중욱,김성연 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3
A SHTT (single hot thermocouple technique) has been applied to measure crystallizing temperature and crystallizing rate of molten mold fluxes. It was possible to measure the crystallizing temperature and crystallizing rate of the commercial mold flux using a SHTT reliably, while the crystallizing temperature from DTA and the breaking temperature showed poor reliability. In SHTT, crystallizing temperature was measured at the continuous cooling speed of 100 K/min, and crystallizing initiation time at 1050℃. The crystallizing initiation time generally decreased for the mold flux of higher crystallizing temperature, and there is good interrelationship (R²=0.9588) between two. It is concluded that the SHTT should be considered as the method of quantifying the crystallization behaviors during continuous casting of steel.
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강의 연속주조시 몰드플럭스의 응고수축이 몰드 내 열전달에 미치는 영향
趙重郁 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
Solidification contraction during crystallization of molten mold fluxes has been observed in a laboratory scale mold. Mold fluxes with larger contraction show smaller mold heat flux in thin slab caster. This implies that thermal resistance at mold/mold flux interface arises from the solidification and crystallization of the flux film. Also, the effect of chemical composition on the solidification contraction has been clarified using synthetic mold fluxes of 1.25∼1.45 basicity, 8∼12 mass % Na_2O, 7∼11 mass % F, 2∼6 mass % Al_2O_3, 1.5∼4.5 mass % MgO. Larger basicity and Na_2O/F ratio yield larger contraction. Especially, mold flux of 12% Na_2O and 7% F shows larger contraction than that of 8% Na_2O and 11% F. Microphotograph analysis shows that the crystallization of sodium fluoride dicalcium silicate (NaF.2CaO.SiO_2) is the main reason for the increase of solidification contraction.
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김선효,전찬욱,조중욱 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.9
The nitrogen reaction between steel and slag was studied by using CaO-Al₂O₃-TiO₂ slag system which has good ability for denitrogenization. The experimentally determined activity of Al₂O₃ increases with increasing TiO₂ content. The nitride capactiy, C_N to quantify the equilibrium nitrogen solubility in the slag increases with increasing TiO₂ content, but decreases with increasing slag basicity. The nitrogen reaction between CaO(BaO)-Al₂O₃-TiO₂ slag and steel may be interpreted by the Network model describing the behavior of oxygen and nitrogen ions in slag. The effect of the addition of BaO for replacing CaO on the nitride capacity was found to be very sensitive to the oxygen potentials. The nitrogen distribution ratio between CaO(BaO)-Al₂O,-TiO₂ slag and 304 stainless steel increased with decreasing Cr content and increasing temperature. Based on the results, the equilibrium nitrogen content in 304 stainless steel can be estimated when the denitrogenization is carried out using the slag investigated.
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