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Microstructural Evolution with Solidification Rate and Heat-Treatment of Single Crystal Superalloy CMSX-4 Grown using Seed
Seed를 이용한 단결정 초내열합금 CMSX-4에서 응고속도 및 열처리에 따른 미세조직 변화
Suncheol Kwon, Jongho Shin, Geunyoung Rim, Gitae Sung, Byunggwan Yoon, Euisuk Jung, Jehyun Lee
권순철, 신종호, 임근영, 성기태, 윤병관, 정의석, 이재현
Korean J. Met. Mater. 2018;56(10):745-754.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.745

Abstract
The CMSX-4 superalloy including refractory elements was directionally solidified using the seed of a [001] single crystal to control the growth direction to [001], where solidification velocity was changed from 25 to 160 μm/s. In the log-log plot between spacing and solidification velocity, the primary dendrite arm spacing and secondary..... More

      
Prediction of Primary Dendrite Arm Spacing with Solidification Velocity and Temperature Gradient during Directional Solidification in CMSX-4 Superalloy
CMSX-4 초내열합금에서 일방향 응고속도와 온도경사의 변화에 따른 1차 수지상 간격 예측
Jongho Shin, Changhoon Sung, Suncheol Kwon, Sukhwan Kwon, Byungmoon Chang, Jehyun Lee
신종호, 성창훈, 권순철, 권석환, 장병문, 이재현
Korean J. Met. Mater. 2018;56(9):674-679.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.674

Abstract
Directional solidification experiments were carried out to estimate the effect of solidification velocity and temperature gradient on primary dendrite arm spacing (PDAS) in the Ni-based superalloy, CMSX-4 alloy. The specimens were solidified at velocities of 1, 5, 25, 50 and 100 mm/s under given temperature gradients of 12.5, 18, 23..... More

                        
Formation of Delta Ferrite with Solidification Rates in 10Cr1MoW Steel
10Cr1MoW강에서 응고속도에 따른 δ 페라이트 형성거동
Suncheol Kwon, Yunkon Joo, Changhoon Sung, Myunggyun Son, Jongho Shin, Seongmoon Seo, Jehyun Lee
권순철, 주윤곤, 성창훈, 손명균, 신종호, 서성문, 이재현
Korean J. Met. Mater. 2018;56(8):589-596.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.589

Abstract
Martensitic 10Cr1MoW steels are widely used for high temperature components in turbine engines because they have good mechanical properties and corrosion resistance. Delta-ferrite can form locally in large ingots and the ferrite phase degrades the metal’s high-temperature properties. To decrease the fraction of delta-ferrite the solidification process should be controlled...... More

                        
Enhanced Mechanical Properties by Directional Solidification and Cold Drawing in Cu Added Zn-Al Alloys
Cu가 첨가된 Zn-Al 합금에서 일방향응고 및 냉간인발에 따른 기계적 특성 향상
Hae Chang Jeong, Min Soo Kim, Jee Hyuk Ahn, Sung Hwan Lim, Seung Zeon Han, Jehyun Lee, Kwang Ho Kim
정해창, 김민수, 안지혁, 임성환, 한승전, 이재현, 김광호
Korean J. Met. Mater. 2017;55(8):529-536.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.529

Abstract
The lamellar structure of two phases, the Zn-rich and Al-rich phases, is formed in a Zn-5 wt% Al eutectic alloy. In order to study the effect of microstructural changes on the tensile properties of eutectic Zn-Al binary alloy, Zn-Al and Zn-Al-Cu alloys were directionally solidified at a growth rate of..... More

      
Mechanical Properties of Discontinuous Precipitated Al-Zn Alloys after Drawing at Room and Cryogenic Temperatures
불연속 석출된 Al-Zn 합금의 상온 및 극저온 인발에 따른 미세조직 변화가 기계적 특성에 미치는 영향
Min Soo Kim, Seung Zeon Han, Jehyun Lee, Sung Hwan Lim, Jee Hyuk Ahn, Sang-Shik Kim, Kwang Ho Kim
김민수, 한승전, 이재현, 임성환, 안지혁, 김상식, 김광호
Korean J. Met. Mater. 2017;55(2):77-84.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.77

Abstract
In order to study the effect of microstructural change on the tensile properties of discontinuous precipitated Al-Zn binary alloy, four different Al-Zn alloys(25, 30, 35, 45 wt% Zn) were aged at 160 ℃ for different aging times(0, 5, 15, 30, 60, 120, 360 min) after being solution treated at 400..... More

      
Evolution of the Solidification Microstructures in Directionally Solidified CM247LC Rod
CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
Jeongseok Lee, Seokhwan Kown, Byunggwan Yoon, Byungmoon Chang, Yongil Jung, Jehyun Lee
이정석, 권석환, 윤병관, 장병문, 정연길, 이재현
Korean J. Met. Mater. 2016;54(11):838-845.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.838

Abstract
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS..... More

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