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Table of Contents | July, 2023  Vol. 61   No.7 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
459 Spheroidization Heat Treatment Conditions with Data Analysis in Medium Carbon Cr-Mo Steel for Ultra High Strength Cold Heading
Yong Deok Jo, Hui Ju Lee, Sung Yi, Byoung Lok Jang
Korean J. Met. Mater. 2023;61(7):459-471.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.459

Abstract
The degree to which parameters affect the spheroidization heat treatment of steel was calculated by setting the spheroidization heat treatment conditions of Cr-Mo steel and using data analysis such as S/N ratio and ANOVA. After analyzing the transformation temperatures of the steel, Ac1 and Ac3 , using a DSC, the..... More

                
472 Effect of Mg Content and Cooling Rate After Solidification on the Mechanical Properties of T5-treated Al-Si-Mg Alloy
Al-Si-Mg합금에서 Mg함량과 주조응고 후 냉각속도가 T5 처리시 기계적 특성에 미치는 영향
Hyeon-Woo Son, Tae-Min Koo, Young-Hee Cho, Jung-Moo Lee
손현우, 구태민, 조영희, 이정무
Korean J. Met. Mater. 2023;61(7):472-479.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.472

Abstract
The effects of Mg content and cooling rate on the T5 treatment of Al-Si-Mg alloys have been investigated using Avrami kinetics and transmission electron microscopy. The alloys were super-heated at 800 oC for 1 hr followed by degassing treatment at 720 oC for 15 min, and poured into a metallic..... More

                   Web of Science 2  Crossref 3
480 Flexible Transparent Planar Heater Comprising ZnO/Cu/Al2O3
ZnO/Cu/Al2O3 구조의 유연 투명 면상발열체 연구
Heechang Kim, Dooho Choi
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 Al2O3 overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al2O3 layers were independently varied to reach the optimum antireflecting condition (maximum..... More

                
489 Effects of Double Doping Germanium and Indium on the Thermoelectric Properties of Permingeatite
Bong-Ki Hong, Il-Ho Kim
Korean J. Met. Mater. 2023;61(7):489-499.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.489

Abstract
Cu3Sb1–x–yGexInySe4 (0.02 ≤ x ≤ 0.12; 0.04 ≤ y ≤ 0.08) permingeatite compounds doped with Ge and In were prepared using solid-state synthesis. The phases and microstructures were analyzed, and the charge transport and thermoelectric properties were evaluated according to the Ge and In doping content. Most of the samples..... More

                
500 Highly Stretchable Strain Sensor with a High and Broad Sensitivity Composed of Carbon Nanotube and Ecoflex Composite
카본나노튜브/Ecoflex 복합체로 제작된 고신축성 및 고감도 신축성 스트레인 센서
Yuhwan Hwangbo, Hyun Jin Nam, Sung-Hoon Choa
황보유환, 남현진, 좌성훈
Korean J. Met. Mater. 2023;61(7):500-508.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.500

Abstract
Wearable strain sensors with high and broad sensitivity, high stretchability and excellent mechanical endurance will be widely useful in smart wearable electronics. In this work, we developed a stretchable strain sensor fabricated with a simple stencil printing technique. The stretchable strain sensor was fabricated using a multi-walled carbon nanotubes (MWCNTs)-Ecoflex..... More

                   Web of Science 4  Crossref 5
509 Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires
MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
Geun-Hyoung Lee
이근형
Korean J. Met. Mater. 2023;61(7):509-513.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.509

Abstract
MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. No nanowires were..... More

                
514 Effect of Supersonic Oxygen Lance on Post-Combustion in Converter Steelmaking Process – Experiment and Analysis with Converter Simulator
전로 제강 공정에서 초음속 산소 랜스가 2차 연소에 미치는 영향 - 전로 모사 가스 반응로 실험 및 해석
Ji-A Lee, Chang-Su Ha, Jeong-Whan Han
이지아, 하창수, 한정환
Korean J. Met. Mater. 2023;61(7):514-523.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.514

Abstract
Employing post-combustion technology in the converter, using the sensible heat of the hot metal and the oxidation reaction heat as a heat source, is known to compensate for insufficient heat in the converter process. However, most studies on post-combustion have been conducted using subsonic nozzles, whereas actual converter processes use..... More

                
524 Microstructural Evolutions and Strengthening Mechanism according to the Aging Temperatures of a High Si Cast Aluminum Alloy
Won-Sang Shin, Yoon-Jun Kim
Korean J. Met. Mater. 2023;61(7):524-533.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.524

Abstract
A356 cast aluminum alloy contains 7 at.% Si and 0.3 at.% Mg, producing an approximately 50% eutectic microstructure. This high Si content and various casting conditions play a significant role in strengthening A356 alloy, by controlling the eutectic morphology and precipitates of other intermetallic compounds. Understanding how Si-related precipitates and..... More

                   Web of Science 1  Crossref 1
534 Residual Stress Analysis of Additive Manufactured A356.2 Aluminum Alloys using X-Ray Diffraction Methods
X-선 회절을 통한 적층제조 A356.2 알루미늄 합금의 잔류응력 분석
[corrected-article]
SangCheol Park, InYeong Kim, Young Il Kim, Dae-Kyeom Kim, Soong Ju Oh, Kee-Ahn Lee, Bin Lee
박상철, 김인영, 김영일, 김대겸, 오승주, 이기안, 이빈
Korean J. Met. Mater. 2023;61(7):534-544.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.534

Abstract
The physical properties of metal-based structural materials, such as hardness, strength and toughness, are directly or indirectly affected by residual stress inside or on the surface of the given part. Repeated rapid heating and cooling during the additive manufacturing process causes thermal gradients and expansion and contraction in the material,..... More

                   Web of Science 1  Crossref 2
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