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진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의 공정 온도에 따른 미세조직 및 기계적 특성 평가
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유상규, 김지원, 이초롱, 오명훈, 최인철
Korean J. Met. Mater.
2024;62(3):229-238. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.229
Abstract
The TiAl alloy is attracting attention as a lightweight and heat-resistant material, because of its high specific strength, excellent high-temperature formability, and fatigue strength. However, its applications are limited by its high unit price and low room temperature ductility. To overcome this issue, dissimilarly bonded materials have been extensively employed......
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Korean J. Met. Mater.
2023;61(2):120-125. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.120
Abstract
In the present study, we analyzed the thermal and mechanical properties of Cu-graphite composites (CGCs) with spatially anisotropic graphite layers. These composites were fabricated using a combination of electroless plating and spark plasma sintering (SPS) processes. Thermal conductivities and thermal expansion coefficients of the composites were measured using differential thermal.....
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탄소 팩 세멘테이션 (Pack cementation) 공정을 통한 상용 Ti-48Al-2Nb-2Cr 합금의 고온 내산화성 개선과 탄소 확산 경로 해석
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김동현, 최광수, 박준식, 이승훈
Korean J. Met. Mater.
2022;60(10):723-731. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.723
Abstract
γ-TiAl alloys have attracted interest as lightweight materials for structural applications at temperatures below 800
o
C. With recent improvements in microstrutural control of the γ-TiAl alloys, resulting in excellent creep properties and high temperature strength, their use can be extended to temperatures higher than 800
o
C. To increase.....
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Web of Science 1
Crossref 1
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Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
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김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater.
2021;59(12):893-903. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.893
Abstract
This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection.....
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Crossref 2
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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.....
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Web of Science 3
Crossref 3
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유가금속 회수를 위한 고로 슬러지의 분산 거동
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정재헌, 이소영, 최 주, 손호상
Korean J. Met. Mater.
2021;59(5):295-303. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.295
Abstract
Blast furnace sludge, which comes from the iron making process, contains many valuable materials including iron, carbon, and zinc, etc. Because a cohesive agent is added during filtration, fine sludge particles are agglomerated together. Therefore, This makes it necessary to disperse the sludge in solution before separating or recovering valuable.....
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Web of Science 1
Crossref 2
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Korean J. Met. Mater.
2021;59(4):239-246. Published online 2021 Mar 24
DOI:
https://doi.org/10.3365/KJMM.2021.59.4.239
Abstract
La/Ce-partially double-filled and Co-charge-compensated (La
1−z
Ce
z
)
0.8
Fe
4−x
Co
x
Sb
12
skutterudites were synthesized, and their thermoelectric properties were studied by varying the filling ratio and charge compensation. X-ray diffraction analysis revealed that the matrix phase was skutterudite and a secondary phase was determined to the marcasite FeSb
2
. However, the formation of marcasite could be inhibited.....
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Web of Science 1
Crossref 1
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열간가공된 TiAl 합금의 미세조직 제어가 기계적 특성에 미치는 영향
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김종훈, 김재권, 김성웅, 박용호, 김승언
Korean J. Met. Mater.
2020;58(7):459-465. Published online 2020 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.7.459
Abstract
The microstructure and mechanical properties of a newly developed, β-phase containing TiAl alloy have been studied through hot working and post heat treatment to enhance room temperature ductility and strength. The controlled microstructures hadthree types of structure, fully lamellar, nearly lamellar and duplex, and were produced by cyclic heat-treatment in.....
More
Web of Science 6
Crossref 5
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액상플루오르카본전구체(Liquid Fluorocarbon Precursor)의 기화를 이용한 흡착 및 회수
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박준영, 오병문, 김경남
Korean J. Met. Mater.
2020;58(6):397-402. Published online 2020 May 14
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.397
Abstract
PFC gas is primarily used during the etching process in the manufacture of ULSIs and in cleaning after CVD processes. PFC is classified as a greenhouse gas that stays in the atmosphere for a long time and has a high GWP. High capacity and high integration have been achieved in.....
More
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Korean J. Met. Mater.
2019;57(12):801-807. Published online 2019 Nov 22
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.801
Abstract
Partially double-filled skutterudites were prepared via encapsulated melting and hot pressing processes. The skutterudite phase was successfully synthesized through partial double filling of La/Yb and substitution of Co. A small quantity of secondary phase (marcasite FeSb
2
) was formed, but its formation was suppressed by increasing Co charge compensation. The marcasite.....
More
Crossref 2
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Ti-44Al-6Nb-2Cr-0.3Si-0.1C 합금의 0.2%SO
2
/Ar가스에서의 고온부식
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Shi Yuke, Xiao Xiao, 김성웅, 홍재근, 한준희, 이동복
Korean J. Met. Mater.
2019;57(10):648-655. Published online 2019 Sep 23
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.648
Abstract
Cast Ti–44Al–6Nb–2Cr–0.3Si–0.1C alloy having good air-oxidation resistance was corroded under 1 atm of flowing 0.2%SO
2
/Ar gas at 900-1100
o
C for 50-300 h in order to examine its corrosion behavior in a SO
2
-containing environment, because SO
2
is an industrially important by-product in the field of combustion and processing of fossil fuels......
More
Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2019;57(6):366-373. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.366
Abstract
p-Type (La1−zNdz)0.8Fe4−xCoxSb12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe. The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified. Partial filling within the filling fraction limit.....
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Web of Science 4
Crossref 3
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β
/B2상을 포함한 Ti-Al-Mo-Nb 합금의 산화 거동과 실리콘 화합물 코팅을 통한 내산화성 개선
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최광수, 송영범, 이승훈, 박준식
Korean J. Met. Mater.
2019;57(3):131-137. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.131
Abstract
Alloys containing the β/B2 phases of Ti-45Al-3Mo, Ti-45Al-3Mo-2Nb and Ti-45Al-5Mo were prepared using an vacuum arc-melting machine. Heat-treatments were carried out at 1250 oC in an Ar atmosphere. The temperature of 1250 oC is the temperature region of phase α + γ + (β/B2), and the heat treatment condition which.....
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Web of Science 2
Crossref 2
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단일 크기와 이중 크기의 탄화규소 입자를 이용한 액상소결 탄화규소의 기계적 특성
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이준엽, 이상필, 이진경, 이문희, 황승국
Korean J. Met. Mater.
2019;57(1):60-66. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.60
Abstract
Both the mechanical properties and probability distribution of liquid phase sintered SiC (LPS-SiC) materials were investigated, based on a detailed analysis of their microstructures. In particular, the effect of the starting sizes of SiC particles on the characterization of LPS-SiC materials was evaluated. LPS-SiC materials were fabricated with a constant.....
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Web of Science 2
Crossref 2
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Korean J. Met. Mater.
2018;56(11):822-828. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.822
Abstract
P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation. In the case of (Ce1-zYbz)0.8Fe4Sb12 without Co substitution, the marcasite (FeSb2) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co.....
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Crossref 1
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Korean J. Met. Mater.
2018;56(10):772-778. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.772
Abstract
Partially La/Pr-double-filled and Co-substituted (La
1−z
Pr
z
)
0.8
Fe
4−x
Co
x
Sb
12
skutterudites were synthesized by encapsulated melting and vacuum hot pressing. (La,Pr)Sb
2
phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb
2
also decreased as the Co content increased. Electrical conductivity decreased with increasing.....
More
Crossref 2
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단 범위 규칙 반응이 Zr-2.5%Nb 압력관 재료의 시효(aging) 현상에 미치는 영향
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김성수, 김영석, 정종엽
Korean J. Met. Mater.
2018;56(7):479-489. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.479
Abstract
This study was conducted to investigate the effect of aging treatment from 300 °C to 420 °C on the mechanical properties of the pressure tube material at 310 °C, which is outlet temperature pressure tube in CANDU reactor. The short range ordering (SRO) phenomenon during aging process is confirmed by.....
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Crossref 3
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Korean J. Met. Mater.
2018;56(6):465-471. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.465
Abstract
(Ce
1-z
Nd
z
)
y
Fe
4-x
Co
x
Sb
12
skutterudites were prepared by encapsulated melting, annealing, and hot pressing. The formation of a marcasite phase (FeSb
2
) was significantly suppressed by partially filling the voids with Ce/Nd and making a Co substitution at the Fe site. Both the Hall and the Seebeck coefficient values were positive, indicating that all.....
More
Crossref 4
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Cast 와 HIP 으로 제작된 베타 감마 TiAl 합금의 열처리 후 2단계 냉각법을 통한 미세구조의 변화
K
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최광수, 김정민, 박준식, 김영원
Korean J. Met. Mater.
2018;56(5):335-341. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.335
Abstract
The beta gamma alloys of Ti - 43.8Al - 4Nb - 2Cr - 0.2B - 0.2C at % (9CN) were prepared using induction skull melted (ISM) cast ingots. In order to make a fine fully lamellar structure with some minor phases, two step cooling was performed using two furnaces after.....
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Crossref 3
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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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Nb 활용 탄질소 스테인리스강의 부동태 및 대기산화 피막 보호성 연구
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이창근, 하헌영, 이태호, 조경목
Korean J. Met. Mater.
2017;55(12):870-879. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.870
Abstract
The effects of Nb on grain refinement and the pitting corrosion resistance of Fe
balance
18Cr10 Mn0.3C0.3NxNb (x = 0.1 and 0.2 wt%) high interstitial alloys were investigated through microstructure analysis and potentiodynamic polarization tests. The resistance to pitting corrosion of the two alloys, covered with a passive film and an air-formed.....
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용사코팅 YSZ 고체 전해질이 응용된 NiO･YSZ 가스센서의 특성
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방일환, 조성용
Korean J. Met. Mater.
2017;55(11):819-824. Published online 2017 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2017.55.11.819
Abstract
A mixed potential-type NiO･YSZ (yttria stabilized zirconia) gas sensor employing 8YSZ solid electrolyte film was fabricated using a thermal spray coating method, and tested in a NO
2
atmosphere at various operating temperatures. The thermal spray coating method is useful for mass producing solid electrolytes without a forming, sintering or bonding.....
More
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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...
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