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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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CuCrFeMnNi 고엔트로피 합금의 열처리에 따른 미세조직 및 기계적 물성 변화 연구
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송호섭, 송성호, 조재영, 송기안
Korean J. Met. Mater.
2023;61(6):449-457. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.449
Abstract
High entropy alloys (HEAs) are defined as a multi-element alloy including more than 4 elements with near equi-atomic percentage. In general, the configurational entropy of the HEAs is known to be sufficient to stabilize a single solid solution, such as body-centered cubic (BCC), face-centered cubic (FCC) and hexagonal-closed pack (HCP)......
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C에서 시효 처리된 Zr-2.5%Nb CANDU 압력관 재료에서 중성자 회절을 이용한 dimensional change 분석
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정종엽, 김형섭, 김성수, 김영석
Korean J. Met. Mater.
2022;60(5):341-349. Published online 2022 Apr 22
DOI:
https://doi.org/10.3365/KJMM.2022.60.5.341
Abstract
The primary boundary of the CANDU reactor consists of Zr-2.5%Nb alloy pressure tubes and SA106 alloy feeder pipes. The pressure tubes are exposed to fast neutron (E>1Mev) irradiation during reactor operation, and experience dimensional changes. The actual dimensional change in the pressure tube during in-service operation is greater than the.....
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Web of Science 1
Crossref 1
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고비강도와 고연신을 가지는 다중변형기구 하이엔트로피 합금 개발
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윤국노, 오현석, 이제인, 박은수
Korean J. Met. Mater.
2021;59(12):857-869. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.857
Abstract
In this study we developed a novel (TRIP+TWIP) high entropy alloy (HEA) with high specific strength and large ductility. First, by controlling the atomic constitution of the 3d transition metals (Cr, Mn, Fe, Co, and Ni), we designed a light-weight TRIP-assisted dual-phase HEA with a non-equiatomic composition of Cr
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40
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, which.....
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Web of Science 1
Crossref 1
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압력 용기 재료 SA508에서 열적 처리에 따른 입계 파괴의 원인
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김성수, 정종엽, 김영석
Korean J. Met. Mater.
2021;59(9):589-601. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.589
Abstract
Intergranular(IG) fracture due to thermal treatment has been reported in a reactor pressure vessel(RPV) steel of Russian light water reactor in last decade. This is attributed to grain boundary segregation of phosphorus (P) or precipitation of carbide, etc.. This is a finding a difference in microstructure before and after IG.....
More
Web of Science 3
Crossref 3
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Ni-base X-750 합금에서의 단 범위 규칙화 반응
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김성수, 정종엽, 김영석
Korean J. Met. Mater.
2020;58(9):590-598. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.590
Abstract
The short range ordering (SRO) reaction of the X-750 Ni-base alloy used as a garter spring material for CANDU reactors was systematically investigated through differential scanning calorimeter (DSC) analysis. Water quenching (WQ) after solution annealing (SA) and 20% cold rolled (CR) X-750 were prepared and these samples were subjected to.....
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Web of Science 5
Crossref 4
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CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
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고준영, 송재숙, 홍순익
Korean J. Met. Mater.
2018;56(1):26-33. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.26
Abstract
The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at.....
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Crossref 5
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희토류 원소계 고엔트로피 벌크 비정질 합금 개발
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김진연, 오현석, 김진우, 박은수
Korean J. Met. Mater.
2018;56(1):14-25. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.14
Abstract
High entropy alloys (HEAs) are a relatively new class of metallic materials. HEAs lead to high mixing entropy and the formation of a simple solid solution rather than intermediate phases. This might be explained by the fact that the configurational entropy outweighs the enthalpy of formation of intermetallic compounds. Meanwhile,.....
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Crossref 1
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CoCrFeMnNi 고엔트로피합금 주조재의 미세조직 및 기계적 특성
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강민주, 원종우, 임가람, 박상협, 서성문, 나영상
Korean J. Met. Mater.
2017;55(10):732-738. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.732
Abstract
In this study, we made large-scale ingots of CoCrFeMnNi high entropy alloy by vacuum induction melting. The as-cast CoCrFeMnNi high entropy alloy contained a high proportion of columnar structures with a few equiaxed grains, and showed single phase fcc solid solutions without macro segregation and low interstitial levels. The tensile.....
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Crossref 4
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고엔트로피 합금강의 시효경화 및 재결정 연화현상
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최병학, 장현수, 김형섭, 문종언
Korean J. Met. Mater.
2017;55(10):684-688. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.684
Abstract
Age hardening and re-crystallization softening of a type of high entropy alloy, CoCrFeMnNi, was performed to investigate the relationship between microstructure and the property of mechanical hardness. Equiatomic CoCrFeMnNi was produced by casting followed by homogenizing, cold rolling and post heat treatments. TEM analysis revealed that the microstructure of the.....
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고엔트로피 합금의 제조 방법과 연구 동향: 리뷰
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임다미, 김형섭
Korean J. Met. Mater.
2017;55(10):671-683. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.671
Abstract
Abstract: High-entropy alloys (HEAs), which are defined as a single phase crystalline solid solution with the composition of each constituent element in the range of 5-35 at%, have been the subject of intensive study in the last decade. Most of the HEA research is focused on alloy design, microstructural characterization,.....
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Crossref 2
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혼합엔트로피 제어에 따른 단일 FCC 고용체 합금의 물성변화 분석
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이제인, 오현석, 김준혁, 박은수
Korean J. Met. Mater.
2017;55(1):1-9. Published online 2017 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2017.55.1.1
Abstract
In the present study, we systematically investigated the effect of entropy of mixing (Δ
S
mix
) on the mechanical and thermal properties of single phase FCC solid solutions with multi-principal elements. An increase in Δ
S
mix
led to an increase in micro-hardness and a decrease in thermal conductivity (κ) due to severe lattice.....
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Crossref 8
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압력 용기 재료 SA508에서 열적 처리에 따른 입계 파괴의 원인
Published online 1999 Nov 30
Abstract
Intergranular(IG) fracture due to thermal treatment has been reported in a reactor pressure vessel(RPV) steel of Russian light water reactor in last decade. This is attributed to grain boundary segregation of phosphorus (P) or precipitation of carbide, etc.. This is a finding a difference in microstructure before and after IG cracking; this cannot...
More
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