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Korean J. Met. Mater.
2024;62(4):292-298. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.292
Abstract
Poly(3-hexylthiophene) (P3HT), a semiconducting polymer, is integral to the development of organic electronic devices. Its optoelectronic properties are significantly influenced by the nature of its intermolecular interactions, predominantly classified as J-type and H-type couplings. This study investigates the effect of sonication on the dielectric properties of P3HT, focusing on the.....
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Ti-Ni-Fe 합금의 R상 변태온도에 미치는 Fe 조성과 열처리 온도의 영향
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김원석, 금나영, 김진용, 김재일
Korean J. Met. Mater.
2024;62(4):251-256. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.251
Abstract
R-phase transformations in TiNi shape memory alloys (Nitinol) have various applications because of their small thermal hysteresis and low fatigue resistance. Adding a third element such as Fe or Al is one of the useful ways to induce R-phase transformation. Controlling the R-phase transformation temperature is crucial for industrial and...
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Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화
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이승호, 윤종천, 어두림, 연시모, 최균석
Korean J. Met. Mater.
2023;61(6):397-403. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.397
Abstract
17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellent mechanical properties and excellent corrosion resistance, and is one of the materials used and studied with the powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that has recently attracted attention in.....
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IN 625 초내열합금의 응고거동 및 상변태 온도 분석
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함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현
Korean J. Met. Mater.
2023;61(4):261-268. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.261
Abstract
The solidification and phase transformation behaviors of IN625 with low C and Fe were investigated through directional solidification and quenching experiments. The primary and secondary dendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating good agreement with theoretical equations. The MC carbide formed at a constant temperature gradient.....
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Web of Science 1
Crossref 3
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Si 및 Al 함량과 항온열처리조건이 초고강도 마르텐사이트-베이나이트 Fe-0.2C-2.0Mn 복합조직강의 미세조직과 인장특성에 미치는 영향
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이응혁, 유창재, 이홍범, 김지훈, 서동우
Korean J. Met. Mater.
2021;59(9):602-612. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.602
Abstract
This study investigated the influence of partial replacement of Si by Al on the microstructure and tensile properties of ultra-high strength steels with martensite-bainite complex microstructure produced by austenitization and subsequent isothermal heat treatment around M
s
temperature. When the isothermal heat treatment was done below the M
s
temperature, the fraction.....
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Web of Science 4
Crossref 4
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Korean J. Met. Mater.
2021;59(8):524-532. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.524
Abstract
The microstructure, mechanical properties and residual stress of flux-cored arc welded ASTM A516-70N carbon steel using a Mn-based low-temperature transformation (LTT) welding consumable were investigated. Microstructural analysis with X-ray diffraction, an electron backscattered diffractometer and a field-emission scanning electron microscope showed that the LTT weld metal was made up of.....
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Web of Science 1
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수소가압 및 응력부식 분위기에서 스테인레스강 SS304의 수소취성균열
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최병학, 이상우, 안종기, 이진희, 임태운
Korean J. Met. Mater.
2020;58(10):653-659. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.653
Abstract
The phenomena of hydrogen induced cracking (HIC) in 304 stainless steels was considered in a hydrogen pressure and stress corrosive atmosphere. Microstructures with chloride pits and stress corrosion cracks around the HIC were analyzed by SEM/EDS. Abnormal phase transformations induced by the hydrogen were analyzed using TEM and diffraction. In.....
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Web of Science 5
Crossref 4
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초탄성 티타늄 합금의 인장 변형거동 고찰
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정혜진, 르우비엣띠엔, 정용하, 홍성태, 한흥남
Korean J. Met. Mater.
2020;58(3):162-168. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.162
Abstract
A superelastic titanium alloy was subjected to uniaxial tensile deformation at room temperature. The microstructural evolution and deformation mechanisms of the superelastic titanium alloy were investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Multiple deformation mechanisms including stress-induced martensitic transformation (SIMT), dislocation slip, {332}<113> and {112}<111> mechanical twinning.....
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Web of Science 5
Crossref 5
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Ti-44.5Ni-5Cu 및 Ti-45.2Ni-5Cu(at%) 합금의 형상기억특성에 미치는 어닐링온도의 영향
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김재일, 황광선
Korean J. Met. Mater.
2019;57(9):562-568. Published online 2019 Aug 21
DOI:
https://doi.org/10.3365/KJMM.2019.57.9.562
Abstract
The effect of annealing temperature on shape memory properties in the Ti-44.5Ni-5Cu and Ti-45.2Ni-5Cu(at%) alloys was investigated by differential scanning calorimeter (DSC) and tensile testing. The martensitic transformation temperature of Ti-44.5Ni-5Cu(at%) increased from 308K to 324K with increasing annealing temperature and did not change with further increasing annealing temperature. This.....
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Web of Science 2
Crossref 2
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고온 변형 곡선을 이용한 동적 재결정 해석과 동적 상변태의 조기 예측
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박노근
Korean J. Met. Mater.
2018;56(11):779-786. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.779
Abstract
There have been previous attempts to observe the occurrence of dynamic ferritic transformation at temperatures even above Ae3 in a low-carbon steel, and not only in steels, but recently also in titanium alloys. In this study, a new approach is proposed that involves treating true stress-true strain curves in uniaxial.....
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Crossref 1
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냉간압연 된 304 오스테나이트 스테인리스강의 열처리에 의한 기계적 특성 평가
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박민하, 김광윤, 장재호, 김형찬, 문형석, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater.
2018;56(7):490-498. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.490
Abstract
Austenitic stainless steels are widely used in a variety of industries, such as power plants, aerospace, automotive, construction and electronics, due to their excellent mechanical properties including ductility, toughness and corrosion resistance. For application in various industries, many parts and products require plastic processes such as cold rolling, cold forging.....
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Crossref 4
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연속냉각 중 산소함량이 Ti-5Al-2.5Fe 합금의 상변태 거동에 미치는 영향
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김도헌, 원종우, 정대원, 이학성, 윤석영, 현용택
Korean J. Met. Mater.
2017;55(9):600-608. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.600
Abstract
The effects of oxygen content on the
β
to
α
phase transformation of the Ti-5Al-2.5Fe alloy during continuous cooling were investigated by varying the oxygen content between 0.08 – 0.41 wt%. Dilatometer tests were performed at cooling rates of 0.05 – 100 ℃/s combined with microstructure observation to examine phase.....
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과공석강에서 합금원소 Cr, Si 첨가 및 상변태 온도가 미세조직 변화와 인장성질에 미치는 영향
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박정훈, 정신웅, 남원종
Korean J. Met. Mater.
2017;55(7):460-469. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.460
Abstract
The effects of alloying elements, especially Cr and Si, and transformation temperature on the microstructures and mechanical properties of hyper-eutectoid steels were investigated. Increases in Si and Cr changed the morphology of cementite in upper bainite, while the morphology of pearlite seemed to be unchanged by the amount of alloying.....
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Fe-5Y
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조성의 기계적 합금화 분말에 형성된 산화물의 상변태 거동
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김가언, 최정선, 노상훈, 강석훈, 최병권, 김영도, 김태규
Korean J. Met. Mater.
2017;55(5):357-362. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.357
Abstract
The phase transformation behavior of the oxides formed in mechanically alloyed Fe-5Y
2
O
3
powder is investigated. Non-stoichiometric Y-rich and Fe-rich oxides with sizes of less than 300 nm are observed in the mechanically alloyed powder. The diffusion and redistribution reactions of the elements in these oxides during heating of the powder.....
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Optical Devices & Energy Materials
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코발트실리사이드 상대전극을 채용한 염료감응형 태양전지의 물성 연구
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노윤영, 김광배, 송오성
Korean J. Met. Mater.
2017;55(1):39-45. Published online 2017 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2017.55.1.39
Abstract
Cobalt silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 100 nm Si/ 100 nm Co on quartz was formed by sputtering and cobalt-silicides were formed by vacuum heat treatment at 500 ℃ and 700 ℃ for 30 min,.....
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WC/Co 초경 스크랩 산화물의 환원/침탄 반응
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권철민, 이길근, 하국현
Korean J. Met. Mater.
2016;54(10):743-751. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.743
Abstract
This study conducted an analysis of the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon under an argon and hydrogen gas atmosphere. The WC/Co hardmetal scrap oxide consisted of WO
3
and CoWO
4
. WO
3
was reduced before CoWO
4
by the solid carbon regardless of gas atmosphere. The simple oxide.....
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Crossref 3
Optical Devices & Energy Materials
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니켈실리사이드 상대전극을 이용한 염료감응형 태양전지의 물성 연구
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김광배, 노윤영, 최민경, 송오성
Korean J. Met. Mater.
2016;54(8):615-620. Published online 2016 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.8.615
Abstract
Nickel silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 50 nm Si/ 50 nm Ni was formed on glass or quartz by sputtering, and nickel silicides were formed by vacuum heat treatments at 450 and 800 ℃ for.....
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Crossref 2
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