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593 |
Effect of Intercritical Heat Treatment and Pre-tempering on Mechanical Properties of SA508 Gr . 1A Low Alloy Steels
SA508 Gr.1A 저합금강의 기계적특성에 미치는 이상영역열처리 및 Pre-tempering 열처리의 영향
Se-mi Hyun, Seokmin Hong, Min-Chul Kim, Jongmin Kim, Seok Su Sohn현세미, 홍석민, 김민철, 김종민, 손석수
Korean J. Met. Mater. 2024;62(8):593-601. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.593
Abstract
To apply the leak-before-break (LBB) concept to the main steam line piping of nuclear power plants, the use of SA508 Gr.1A low-alloy steel is being considered. To increase the LBB safety margin, it is essential to improve the strength and toughness of the material. In this study, intercritical heat treatment..... More
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602 |
Effects of Hot Rolling Process Conditions on Microstructure and Mechanical Properties of Hot-rolled Al-Zn-Mg-Cu-Sc-Zr Alloys
열간압연 공정 조건이 열간압연된 Al-Zn-Mg-Cu-Sc-Zr 합금의 미세조직과 기계적 특성에 미치는 영향
Minkyung Jeong, Suyeon Jo, Donggil Lee, Seungwoo Yuk, Taeho Lee, Soo Yeol Lee, Su Hyeon Kim, Jun Hyun Han정민경, 조수연, 이동길, 육승우, 이태호, 이수열, 김수현, 한준현
Korean J. Met. Mater. 2024;62(8):602-612. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.602
Abstract
7xxx series aluminum alloys possess extremely high cold working yield strength, which make hot working processes essential for component manufacturing. Preheating specimens before or between hot rolling processes significantly affects the mechanical properties of the hot rolled Al alloy sheets, depending on the preheating temperature and time. In this study,..... More
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613 |
Research on Exposure to Salt Water Environment of Fe-based Amorphous Alloy Coating Fabricated by Twin Wire Arc Spray
Twin wire arc spray 공정을 통해 제작된 Fe계 비정질 합금 코팅의 염수 환경 노출에 대한 연구
Hansol Kwon, Yongjin Kang, Yeonwoo Yoo, Dohyeon Kim, Youngjin Park, Uk Hee Nam, Eungsun Byon권한솔, 강용진, 유연우, 김도현, 박영진, 남욱희, 변응선
Korean J. Met. Mater. 2024;62(8):613-623. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.613
Abstract
Fe-based amorphous alloys are promising structural materials that have a disordered lattice structure and metastable state. Due to their advanced properties, including high hardness, high elastic limit, improved wear and corrosion resistance, Fe-based amorphous alloys have a great potential for protective materials in harsh industrial fields. Twin wire arc spray..... More
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624 |
Differential Analysis of Surface-Dominated vs. Bulk-Dominated Electrochemical Processes in Lithium Iron Phosphate Cathodes
Byoung-Nam Park
Korean J. Met. Mater. 2024;62(8):624-630. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.624
Abstract
We employed electrophoretic deposition (EPD) using AC voltage to prepare lithium iron phosphate (LFP) Li-ion battery electrodes with varying the LFP thickness, to compare bulk-limited electro chemical reaction with the surface-limited electrochemical reactions. We analyzed the electrochemical performances of the thin and thick LFP electrodes at various scan rates. They..... More
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631 |
Synthesis of Mesoporous CuOx Using Inverse Micelle Sol–gel Process for NO2 Gas Sensing
Sung Gue Heo, Sangwoo Kim, Seok-Jun Seo, Jae Jin Sim, Jiyeon Shin, Ali Mirzaei, Myung Sik Choi
Korean J. Met. Mater. 2000;62(8):631-638. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.631
Abstract
Nitrogen dioxide (NO 2) is a highly dangerous gas, mostly emitting emitted from fossil fuels, and a major contributor to air pollution. It has negatively effects affects on the human health as well asand contributes to environmental issues like acid rain. In this study, mesoporous CuO x nanoparticles (NPs) were successfully synthesized..... More
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639 |
Fabrication of Heat-generating Polyester through Formation of Conductive Silver Nanowire Network
은 나노와이어 전도성 네트워크 형성을 통한 발열 폴리에스테르 섬유 제조 연구
Hyeon Jae Lee, Dooho Choi이현재, 최두호
Korean J. Met. Mater. 2024;62(8):639-644. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.639
Abstract
In recent years, extensive research has been conducted on wearable smart garments incorporating various materials and technologies, among which heating garments with the ability to generate heat through battery-powered circuits have gained significant attention. However, traditional methods utilizing heating wires suffer from drawbacks such as increased weight, lack of flexibility..... More
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645 |
Microwave Absorption Characteristics of M2+, 3+ (M = Mn3+, Zn2+, Ni2+)-substituted Sr3Co2Fe24O41 Hexaferrite Composites
M2+, 3+ (M = Mn3+, Zn2+, Ni2+)이 치환된 Sr3Co2Fe24O 41 hexaferrite 복합체의 전자기파 흡수 특성
Jae-Hee Heo, Young-Min Kang허재희, 강영민
Korean J. Met. Mater. 2024;62(8):645-655. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.645
Abstract
Mn, Zn, Ni-substituted Z-type hexaferrites, Sr 3Co 2Fe 24O 41 (Sr 3Co 2Fe 24-xMn xO 41, Sr 3Co 2-yZn yFe 24O 41, Sr 3Co 1-zNi zZnFe 24O 41), were prepared by sol-gel synthesis processes and their high-frequency magnetic, dielectric and electromagnetic (EM) wave absorption characteristics were investigated. Substituting Mn for Fe by x = 0.5 maintained the single-phase Z phase while shifting the μ' , μ″ spectra towards lower..... More
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656 |
Investigation of Atomic-Scale η1 Precipitate Growth in Aluminum-Zinc-Magnesium Alloys
알루미늄-아연-마그네슘 합금의 원자단위 투과전자현미경 관찰 기반 η1 석출물 성장 고찰
Hwangsun Kim, Heung Nam Han김황선, 한흥남
Korean J. Met. Mater. 2024;62(8):656-661. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.656
Abstract
Aluminum-Zinc-Magnesium (Al-Zn-Mg) alloys are extensively utilized in aerospace and automotive industries because of their exceptional mechanical properties and light weight. These properties of Al-Zn-Mg alloys are significantly influenced by the morphology, distribution, and size of the precipitates within the alloy, which result from the formation of numerous nanoscale precipitates. Among..... More
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662 |
Effect of {10–12} Twins on Precipitation Behavior of Extruded Mg–8Al–0.5Zn Alloy During Low-temperature Aging
{10-12} 쌍정이 저온 시효 중 Mg-8Al-0.5Zn 합금 압출재의 석출거동에 미치는 영향
Hyun Ji Kim, Ye Jin Kim, Sung Hyuk Park김현지, 김예진, 박성혁
Korean J. Met. Mater. 2024;62(8):662-671. Published online 2024 Jul 31 DOI: https://doi.org/10.3365/KJMM.2024.62.8.662
Abstract
This study investigates the influence of {10–12} twins on the aging behavior of an extruded Mg–8Al–0.5Zn (AZ80) alloy during aging at 150 °C. The extruded AZ80 alloy is subjected to a compressive strain of 6% along the transverse direction and is subsequently aged at 150 °C. The sample with {10–12}..... More
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672 |
Optimization of Ion Beam-Assisted Deposition Process for Y2O3 Film to Enhance Plasma Resistance
내 플라즈마 특성 강화를 위한 Y2O3 필름의 이온 빔 보조 증착 공정 최적화
[Original]
Choluk Oh, Ojun Kwon, Younghun Bae, Hyejin Shin, Young Min Kwon, Byungjin Cho오철욱, 권오준, 배영헌, 신혜진, 권영민, 조병진
Korean J. Met. Mater. 2024;62(8):672-672. Published online 2024 Aug 5 DOI: https://doi.org/10.3365/KJMM.2024.62.8.672
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