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DC 마그네트론 스퍼터링에서 입방정 질화붕소 박막의 증착 거동에 미치는 이온 플럭스 변화의 영향
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최영환, 허주열, 백영준
Korean J. Met. Mater.
2023;61(11):824-829. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.824
Abstract
Cubic boron nitride (cBN) thin films were deposited using DC magnetron sputtering, and the effect of the ion flux on the deposition behavior and residual stress of the cBN thin films was investigated. To increase the ion flux, the magnetic force ratio of the central/peripheral permanent magnets inserted in the.....
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Korean J. Met. Mater.
2022;60(11):858-864. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.858
Abstract
NbFeSb-based alloys are promising
p
-type half-Heusler materials with excellent thermoelectric performance, thermal stability, and naturally abundant constituent elements. Alloying and doping are powerful techniques for enhancing the thermoelectric properties of half-Heusler materials. This study experimentally investigated the effects of V alloying in NbFeSb codoped with Ti, Zr, and Sn. As.....
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강도조합에 따른 TWB 핫스탬핑 부품의 미세구조 및 충돌성능 비교 분석
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이창욱, 황연정, 허욱, 유병길, 유지홍, 김태정, 윤광민
Korean J. Met. Mater.
2022;60(11):801-810. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.801
Abstract
Hot stamping technology has been steadily developed because it provides both excellent formability and high strength. With the development of TWB hot stamping technology, it is now possible to freely apply the required strength and thickness in the right place. In this study, the microstructure and collision performance of TWB.....
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Web of Science 1
Crossref 2
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300-400
o
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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페라이트-펄라이트 조직 저탄소강의 수소 취성에 미치는 Nb 첨가와 예비 변형의 영향
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고석우, 이지민, 황병철
Korean J. Met. Mater.
2020;58(11):752-758. Published online 2020 Oct 15
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.752
Abstract
The effect of pre-strain on the hydrogen embrittlement of Nb-free and Nb-added low-carbon steels with ferrite-pearlite structure was investigated in this study. After the steels were electrochemically charged with hydrogen, slow-strain rate tensile (SSRT) tests were conducted on them to examine hydrogen embrittlement behavior. The SSRT test results revealed that.....
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Web of Science 4
Crossref 4
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Zr-2.5%Nb 압력관 재료에서
α
-Zr 영역에서의 소둔에 의한
β
-상 분해가 재결정에 미치는 영향
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김성수, 임상엽, 이경근
Korean J. Met. Mater.
2020;58(10):672-679. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.672
Abstract
The effects of β phase decomposition on recrystallization and texture variation in Zr-2.5% Nb alloy pressure tube material were investigated. Isothermal annealing was conducted at 350 to 550
o
C for 240 hours, and isothermal annealing was performed at 500
o
C for 240 to 3,000 hours. The recrystallization and texture variation.....
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Web of Science 1
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Halide activated pack cementation에 의한 silicide 코팅층의 형성에 따른 Nb 합금의 산화거동
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양원철, 정중희, 이상엽, 백경호, 김영무, 이성, 박준식
Korean J. Met. Mater.
2020;58(8):507-514. Published online 2020 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.507
Abstract
In this study, we tried to improve the oxidation resistance of Nb-12Si (wt%) alloys at 1200 °C or higher through pack cementation coatings. Nb-12Si (wt%) alloys were prepared by arc-melting under Ar atmosphere. When the alloys were coated using pack powder mixtures composed of Si, Al
2
O
3
and NaF, two silicide.....
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핫스탬핑 열처리 온도가 Al-10% Si 도금 30MnB5 강의 점용접성에 미치는 영향
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손성국, 황연정, 이창욱, 유지홍, 최민수
Korean J. Met. Mater.
2019;57(12):778-786. Published online 2019 Oct 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.778
Abstract
Hot stamping is the most efficient manufacturing process to produce high strength automotive parts with reduced springback. Recently, 30MnB5 steel has been developed for hot stamping steel which can provide above 1700 MPa. However, resistance spot weldability of this steel is insufficient due to the need for a large amount.....
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Web of Science 4
Crossref 4
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고주파 유도 가열에 의한 나노구조의 Nb-Al
2
O
3
복합재료 제조와 기계적 성질
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김성은, 오세훈, 손인진
Korean J. Met. Mater.
2019;57(11):701-707. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.701
Abstract
Al
2
O
3
has a high Young’s modulus (380 GPa), a low density (3.98 g· cm
-3
), good high-temperature mechanical properties, biocompatibility and excellent oxidation resistance. Al
2
O
3
has been used for automotive, aerospace, bio-materials and various industrial applications. Despite its various merits, the low fracture toughness of the material below the brittle-ductile transition.....
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Web of Science 2
Crossref 1
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9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
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문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater.
2019;57(7):422-429. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.422
Abstract
Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M
23
C
6
. Nitrogen was reduced from 0.04 to.....
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Web of Science 1
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Zr-2.5%Nb 압력관 재료에서 수소 농도와 균질화 처리 온도에 따른 수소화물 석출 거동
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임상엽, 김성수, 이경근
Korean J. Met. Mater.
2019;57(4):203-213. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.203
Abstract
The precipitation characteristics of hydrides in Zr-2.5% Nb pressure tube material were investigated for various hydrogen concentrations and homogenization temperatures. A surface hydride was formed using the electrolytic method and homogenized at various temperatures up to at 550 oC. The homogenization treatment was carried out at 300-550 oC over 240.....
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Web of Science 4
Crossref 3
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핫스탬핑용 30MnB5강의 템퍼링 조건에 따른 미세조직 및 기계적 물성 연구
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정준영, 박상천, 신가영, 이창욱, 김태정, 최민수
Korean J. Met. Mater.
2018;56(11):787-795. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.787
Abstract
The effects of tempering condition on the microstructure and mechanical properties of 30MnB5 hot stamping steel were investigated in this study. Before the tempering, hot-stamped 30MnB5 steel was composed of only α′-martensite microstructure without precipitates. After the tempering at 180 ℃ for 120 min, nano-sized ε-carbides were precipitated in the.....
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Crossref 9
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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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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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