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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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개량 Al-0.7Mn 합금의 미세조직, 부식 저항성 및 인장 특성
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황원구, 강태훈, 최호준, 신영철, 이승철, 이기안
Korean J. Met. Mater.
2024;62(11):886-896. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.886
Abstract
A modified alloy (Al-0.7Mn) was designed and fabricated with an increased Mn content up to 0.7wt.% and a controlled Fe content of 0.1wt.% and compared with the conventional Al3102 (Al-0.3Mn) alloy using the air-slip casting process. Both alloys were homogenized at 510°C for 10 hours and then air-cooled. The microstructure,.....
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MATLAB을 이용한 Ag Metal-mesh 기반의 투명 전극 특성 분석
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조승택, 신진욱, Walter Commerell, 유대황, 류혜선, 황진영, 김현식, 김상일, 노종욱
Korean J. Met. Mater.
2024;62(6):464-471. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.464
Abstract
It is well-known that optical transparence and electric resistance have a trade-off relationship in transparent electrodes. For this reason, developing methods to predict this relation have been important in various fields of academic research as well as for industrial applications. Herein, we suggest a simple method which reveals the relationship.....
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고신뢰성 적층 세라믹 커패시터를 위한 침식방지형 주석도금액 개발
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구본일, 김준성, 손유진, 민경석, 백성현
Korean J. Met. Mater.
2024;62(3):180-189. Published online 2024 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.180
Abstract
Capacitors not only store and release electricity but selectively conduct alternating current. Among the various types of capacitors, multi-layer ceramic capacitors (MLCCs) have been widely used in automotive, smartphone, and wearable devices because of their compact size and high capacitance capabilities. In this study, we have developed an electrolyte for.....
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알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교
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전현욱, 김재훈, 김원호, 천주용, 배기만, 이은경, 박영도, 지창욱
Korean J. Met. Mater.
2024;62(1):1-11. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.1
Abstract
This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and Al 6014-T4 alloy, and the cause of the differences in the weldability was investigated. In general, the surface of the aluminum alloy has an oxide film several nm thick, and local heat input is generated.....
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Web of Science 2
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항복강도 70 ksi급 전기저항용접 강관의 입열량 및 심 어닐링 온도에 따른 미세조직과 저온충격인성 상관관계 고찰
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김태훈, 김치원, 이찬희, 곽진섭, 전동현, 홍현욱
Korean J. Met. Mater.
2023;61(9):659-668. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.659
Abstract
In this study, the influence of heat input and post-seam annealing (PSA) temperature on the microstructure and impact toughness of electric resistance welded (ERWed) API X70 steel pipe was investigated. The ERW seam welds of pipes were fabricated with low, moderate, and high heat inputs, and followed by the PSA.....
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Web of Science 3
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소형원자로 내식성 향상을 위한 Alloy 82 분말의 레이저 클래딩 연구
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최인성, 정원찬, 송단비, 서정, 이광현, 김용재, 정인철
Korean J. Met. Mater.
2023;61(8):561-572. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.561
Abstract
There has been an increased demand for surface modification technologies to enhance corrosionresistance and wear-resistance. Among the representative surface coating technologies, laser cladding has attracted great attention because of its multiple advantages including low heat input, low dilution ratio, controllable clad height, etc. Recently, laser cladding has been considered as.....
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구조의 유연 투명 면상발열체 연구
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김희창, 최두호
Korean J. Met. Mater.
2023;61(7):480-488. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.480
Abstract
In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al
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overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al
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layers were independently varied to reach the optimum antireflecting condition (maximum.....
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Web of Science 2
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Cu 박막의 두께 변화에 따른 면상발열체 특성 연구
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최두호
Korean J. Met. Mater.
2022;60(7):511-516. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.511
Abstract
In this study, ultrathin (4-40 nm) Cu-layer-based transparent heaters prepared on glass substrates were investigated for cost-effective applications. The Cu heaters were embedded between ZnO layers serving as anti-reflection and anti-corrosion layers. The Cu layer thicknesses varied in the range of 4-40 nm, and the corresponding structural, electrical, optical and.....
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Web of Science 1
Crossref 1
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실리카 나노입자의 분산도가 주형의 항절강도에 미치는 영향
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김판성, 배민아, 백재호, 제정호, 이만식
Korean J. Met. Mater.
2022;60(6):478-487. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.478
Abstract
Sodium silicate solutions are used as an eco-friendly binder in the casting process. However, the strength of sand molds using the sodium silicate solutions is reduced because of their low humidity resistance. In this study, silica nanoparticles were added to a sodium silicate solution with a constant SiO
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/Na
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O ratio to.....
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Crossref 3
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Al 5052-H32 합금의 저항 점 용접 시 가압력 제어 방식에 따른 미세조직 및 용접특성 비교
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김원호, 김재훈, 전현욱, 김재원, 이은경, 지창욱
Korean J. Met. Mater.
2022;60(5):350-359. Published online 2022 Apr 22
DOI:
https://doi.org/10.3365/KJMM.2022.60.5.350
Abstract
Recently, lightweight vehicle bodies are in increasing demand to satisfy exhaust gas and environmental regulations around the world. In particular, aluminum alloys are widely used to manufacture lightweight parts, because of their excellent properties including corrosion resistance and mechanical properties. After the forming process, the welding process is important for.....
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Web of Science 3
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Korean J. Met. Mater.
2022;60(1):46-52. Published online 2021 Dec 10
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.46
Abstract
This study evaluated changes in delta-ferrite content depending on the preheating of AISI 316L stainless steel. We also determined the reasons for the variation in delta-ferrite content, which affects corrosion resistance. Changes in delta-ferrite content after preheating was confirmed using a Feritscope, and the microstructure was analyzed using optical microscopy.....
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Web of Science 5
Crossref 5
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Korean J. Met. Mater.
2022;60(1):26-34. Published online 2021 Dec 10
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.26
Abstract
This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness.....
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슈퍼커패시터 전극 제조시 Indium-Tin-Oxide기판 위 활성탄 증착에 적합한 바인더와 용매 소재
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최영묵, 전상은
Korean J. Met. Mater.
2021;59(12):911-920. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.911
Abstract
Supercapacitor electrode slurry is prepared for mass production by mixing activated carbon powder, conductive agent, and binder, which is then deposited on a substrate using the doctor-blade method. Polyvinylidene fluoride (PVDF) and 1-methyl-2-pyrrolidone (NMP) are used as binder and solvent, respectively, to form the electrode slurry on a metal substrate......
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Web of Science 3
Crossref 3
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Korean J. Met. Mater.
2021;59(11):821-828. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.821
Abstract
A three-dimensionally interconnected graphene-reinforced Cu (3Di Gr-Cu) composite was synthesized using a simple two-step process technique which involves the mechanical compaction of micronsized Cu particles followed by chemical vapor deposition (CVD) at 995 ℃. The microstructural properties of pure Cu and the 3Di Gr-Cu composite were investigated by optical.....
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Web of Science 2
Crossref 2
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텅스텐 나노박막의 상변태를 이용한 반투명 면상발열체 형성 연구
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최지윤, 최두호
Korean J. Met. Mater.
2021;59(9):664-669. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.664
Abstract
In this study, we prepared highly thermostable semi-transparent heaters composed of W layers with thicknesses of 1-20 nm, on which a 30 nm-thick ZnO layer was deposited to serve as an anti-oxidation barrier. The optical transmittance and sheet resistance of the heaters could be greatly modulated by varying the W.....
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Web of Science 1
Crossref 2
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내식성 향상을 위한 기능성 초발수 스테인리스 스틸 (SUS 304) 표면 연구
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박영주, 정찬영
Korean J. Met. Mater.
2021;59(4):217-222. Published online 2021 Mar 24
DOI:
https://doi.org/10.3365/KJMM.2021.59.4.217
Abstract
Stainless steel is a metal with excellent workability, economy, and corrosion resistance, so it is used in various industrial applications including the marine, machinery, electronic parts, piping, power generation, and nuclear power fields. However, in contaminated environments such as marine and gas pipelines, stainless steel has problems, including surface aging.....
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Web of Science 5
Crossref 4
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반응성 스퍼터링법으로 제조된 Al
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막을 이용한 ZnO/Cu/ZnO 투명 히터의 내식성과 투과도 개선 연구
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방금혁, 최두호
Korean J. Met. Mater.
2021;59(3):155-161. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.155
Abstract
In this study, we report a methodology that simultaneously improved the corrosion resistance and visible transparency of ZnO/Cu/ZnO transparent heaters with the addition of reactively sputtered Al
2
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layers. To assess corrosion resistance, ZnO and Al
2
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layers with thicknesses in the range of 0-20 nm were deposited onto 20 nm-thick Cu.....
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Web of Science 4
Crossref 4
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수용액 기반 소듐 이온 배터리용 헥사사이아노철산 니켈의 전기화학 거동에 미치는 전해질내 음이온의 영향
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박성준, 전상은
Korean J. Met. Mater.
2020;58(12):896-906. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.896
Abstract
Nickel hexacyanoferrate (NiHCF) has a three-dimensional open framework structure, excellent long-cycling stability and rate performance as a cathode for aqueous sodium-ion batteries. However, the specific capacity of NiHCF is lower than that of present cathodes for aqueous batteries. A sodium-ion electrolyte was explored to achieve optimum capacity with NiHCF. Powder-type.....
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Web of Science 4
Crossref 3
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A6014-T4 합금 소재의 저항 점 용접 시 용융 거동 및 전극 열화에 미치는 전극 패터닝 효과
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전현욱, 김재훈, 김재원, 이은경, 김양도, 지창욱
Korean J. Met. Mater.
2020;58(12):863-874. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.863
Abstract
In this study, the effects of electrode surface design on the resistance spot weldability and degradation of the electrode following resistance spot welding (RSW) of aluminum 6014-T4 alloy were investigated. A new patterning method that can be produced through repetitive pressurization was applied to the electrode, producing a lattice-like pattern.....
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Web of Science 6
Crossref 7
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레이저 직접적층법으로 제조된 Fe-8Cr-3V-2Mo-2W합금의 마모특성에 미치는 열처리공정 및 상대재의 영향
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하경식, 박영근, 김태환, 백경윤, 전종배, 심도식, 문영훈, 이욱진
Korean J. Met. Mater.
2020;58(10):680-692. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.680
Abstract
This study aimed to investigate the wear performance of laser direct energy deposited Fe-8Cr3V-2Mo-2W alloy under various wear environments, in terms of different heat treatment conditions. Ball on disk tribology tests were performed using high-carbon steel and zirconia balls as counter materials. The wear rates of the alloy depended significantly.....
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Web of Science 8
Crossref 10
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Korean J. Met. Mater.
2020;58(8):560-565. Published online 2020 Jul 27
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.560
Abstract
This study investigated the influence of laser shock peening without coating (LSPw/oC) on the degradation of copper electrical contacts. A theoretical calculation of the plastic-affected depth (PAD) induced by LSPw/oC was performed, based on the laser-induced plasma pressure along with the Hugoniot elastic limit of our LSPw/oC experimental conditions. The.....
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Web of Science 4
Crossref 3
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AZ31 마그네슘 합금의 플라즈마전해 산화막 두께 성장에 따른 내식특성
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최보은, 정원섭, 김용환
Korean J. Met. Mater.
2020;58(2):87-96. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.87
Abstract
The growth of the PEO coating with processing time on an AZ31B magnesium alloy in a dilute alkaline electrolyte containing silicate and the corrosion characteristics according to its thickness were investigated. The oxide film grew a porous outer layer mainly consisting of silicate with the spark discharge phenomenon from the.....
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Web of Science 2
Crossref 2
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CBAPC 바인더로 제조한 인공사 중자의 강도 및 내습성에 미치는 P/Al 몰 비와 경화 조건의 영향
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오현곤, 박동국, 김양도, 이만식
Korean J. Met. Mater.
2019;57(12):808-816. Published online 2019 Nov 22
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.808
Abstract
CBAPC (chemically bonded aluminum phosphate ceramic) binders have various advantages, including superior corrosion resistance and strength at high temperature. They are also a non-toxic and eco-friendly material. We investigated an inorganic binder based on CBAPC using artificial sand for casting. The CBAPC binders were synthesized with various P/Al molar ratios.....
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Crossref 1
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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 5
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초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
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김재원, Siva Prasad Murugan, 강남현, 박영도
Korean J. Met. Mater.
2019;57(11):715-725. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.715
Abstract
Evaluation of electrode degradation in resistance spot welding of 1180TRIP steel was carried out through an electrode life test, and weldability testing was performed by the measurement of the nugget size, the peak load analysis and the measurement of the electrode tip size at 30 intervals. Analysis of the change.....
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Web of Science 7
Crossref 6
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Korean J. Met. Mater.
2019;57(11):708-714. Published online 2019 Oct 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.708
Abstract
Resistance Element Welding (REW) is a novel processing technology developed to join dissimilar materials such as aluminum and steel. It uses an auxiliary steel rivet (element) inserted into an aluminum sheet that forms a resistance spot weld with the steel sheet, and the aluminum work piece is mechanically joined by.....
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Web of Science 7
Crossref 9
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3가 크롬 도금욕에서 펄스 도금의 전기화학적 변수 최적화를 통한 크롬 도금막의 내식성 향상 연구
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임채원, 임동욱, 구본일, 심상은, 백성현
Korean J. Met. Mater.
2019;57(10):641-647. Published online 2019 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.641
Abstract
Electroplating chromium films in a trivalent chromium bath has been extensively investigated as a replacement for the conventional hexavalent chromium bath. However, commercialization of the trivalent chromium method has been hindered because the resulting chromium films exhibit inferior mechanical properties compared to hexavalent chromium coated film. In this study, we.....
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합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
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황연정, 이창욱, 신가영, 유지홍, 최민수
Korean J. Met. Mater.
2019;57(3):193-201. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.193
Abstract
The hot stamping process is beneficial for fabricating high strength automotive parts without spring back. To suppress high temperature oxidation and decarburization, it is necessary to coat the hot stamping steel. In the present work, the performance of galvannealed coated (GA) hot stamped steel was evaluated. During cyclic corrosion tests,.....
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Web of Science 6
Crossref 7
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스퍼터링법으로 증착된 ZnO/Ag/ZnO 투명전극의 성능 최적화 연구
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조우현, 최두호
Korean J. Met. Mater.
2019;57(2):91-96. Published online 2019 Jan 11
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.91
Abstract
The critical role of the thicknesses of the top and bottom oxide layers, as well as Ag layer, in ZnO/Ag/ZnO transparent conductive electrodes were investigated. The Ag forms a nearly continuous layer at the thickness of 8 nm, at which the Ag sheet resistance of 8.0 Ω/Sq. is lower than.....
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Web of Science 9
Crossref 9
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고강도 탄소강 FCA 용착금속의 고온균열 저항성과 저온 충격인성에 미치는 보론과 망간의 영향
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박수길, 조영호, 지춘호, 이정훈, 서성문, 강남현
Korean J. Met. Mater.
2019;57(1):28-37. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.28
Abstract
The hot crack resistance and mechanical properties of flux cored arc (FCA) welds were investigated with three kinds of welding consumables having different boron (B) and manganese (Mn) contents for high strength carbon steel. The hot crack resistance, measured from self-restraint testing, strongly depended on the amount of B in.....
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Web of Science 3
Crossref 3
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