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Table of Contents | June, 2023  Vol. 61   No.6 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
389 Tensile testing at the Extremely Low Temperature of 6K : Microstructure and Mechanical Properties of a Fe-Mn-Cr Steel
6K 초극저온 인장 시험 : Fe-Mn-Cr 강의 미세조직 및 기계적 물성
Young-Kyun Kim, Ka-Ram Lim, Young-Sang Na
김영균, 임가람, 나영상
Korean J. Met. Mater. 2023;61(6):389-396.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.389

Abstract
Materials with superior cryogenic strength and good ductility are increasingly in demand for resident friendly liquid-hydrogen (20K) storage tanks. Additionally, the space industry also requires materials that retain excellent mechanical properties at extremely low temperatures. However, mechanical testing at such low temperatures is highly limited due to the difficulties in..... More

                   Web of Science 1  Crossref 2
397 Changes in Microstructure and Mechanical Properties of 17-4PH Stainless Steel according to the Application of Laser Rotation in the Powder Bed Fusion(PBF) Process
Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화
Seung-Ho Lee, Jong-Cheon Yoon, Du-rim Eo, Si-Mo Yeon, Kyun-Suk Choi
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..... More

                
404 Effect of Ni-based Fillers on Corrosion Resistance of Heat Affected Zone of Super Austenitic Stainless Steel (UNS S31254) Welded by GTAW
GTAW로 용접한 초내식성 오스테나이트계 스테인리스강 (UNS S31254) 열영향부의 내식성에 미치는 Ni계 용가재의 영향
Jin Sung Park, Dong Min Cho, Seung Gab Hong, Tae Ho Yun, Sung Jin Kim
박진성, 조동민, 홍승갑, 윤태호, 김성진
Korean J. Met. Mater. 2023;61(6):404-413.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.404

Abstract
The effect of Ni-based fillers on corrosion resistance of welded super austenitic stainless steel (SASS) was examined. The use of Ni-based fillers for gas tungsten arc welded SASS leads to the formation of fine Cr-Mo enriched phase in its weld unmixed zone, which makes it more susceptible to the localized..... More

                   Crossref 1
414 Gadolinium-Doped CeO2 Gas Sensor for H2S Sensing
Changhyun Jin, Sangwoo Kim, Dong Eung Kim, Ali Mirzaei, Jong Wook Roh, Sun-Woo Choi, Myung Sik Choi
Korean J. Met. Mater. 2023;61(6):414-421.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.414

Abstract
Dihydrogen sulfide (H2S) gas has a flammable nature and is one of the most toxic and dangerous gases. Even small concentrations can be fatal to humans. Herein, we investigated the H2S gas-sensing features of commercial pristine cerium oxide (CeO2 ) and gadolinium (Gd)-doped CeO2 (GDC) nanoparticles. First, the sensing materials..... More

                   Web of Science 1  Crossref 2
422 Improved Thermoelectric Performance of Cu3Sb1−x−ySnxInySe4 Permingeatites Double-Doped with Sn and In
Ho-Jeong Kim, Il-Ho Kim
Korean J. Met. Mater. 2023;61(6):422-430.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.422

Abstract
Cu–Sb–Se ternary chalcogenide compounds composed of earth-abundant low-toxicity elements are attracting attention as economical and ecofriendly semiconductors. Among them, permingeatite (Cu3SbSe4) is a potential thermoelectric material with high Seebeck coefficient and low lattice thermal conductivity. However, it is necessary to improve its thermoelectric properties through doping, as it has low..... More

                
431 Enhanced Thermoelectric Transport Properties in Cu-added Bi2Se3 Polycrystalline Alloys
Hyungyu Cho, TaeWan Kim, Seung Min Kang, Sanghyun Park, Sang-il Kim
Korean J. Met. Mater. 2023;61(6):431-436.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.431

Abstract
The addition of Cu to layered Bi2Te3-based thermoelectric alloys has been studied as an effective way to enhance thermoelectric transport properties. In this study, the influence of adding Cu to Bi2Se3 alloys, which have the same rhombohedral crystal structure as Bi2Te3, was investigated by synthesizing a series of CuxBi2Se3 (x..... More

                   Web of Science 1  Crossref 1
437 Synthesis and Thermoelectric Properties of La-doped n-type Mg3SbBi Materials
La 도핑된 n형 Mg3SbBi 열전소재의 합성 및 열전특성
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bok-Ki Min, Bong-Seo Kim
주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater. 2023;61(6):437-443.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.437

Abstract
Mg3Sb2-based materials are very promising for thermoelectric applications at low temperatures, and are strong candidates to replace n-type Bi2Te3 for cooling and power generation. Substituting Sb atoms with chalcogen elements (S, Se, Te) is a typical method of n-type doping, while doping the Mg site with Group 3 elements (Y,..... More

                   Web of Science 1  Crossref 1
444 Branched MgO Nanowires Synthesized by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
Geun-Hyoung Lee
이근형
Korean J. Met. Mater. 2023;61(6):444-448.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.444

Abstract
MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary..... More

                
449 Influence of Heat-Treatment on Microstructures and Mechanical Properties of CuCrFeMnNi High-Entropy Alloy
CuCrFeMnNi 고엔트로피 합금의 열처리에 따른 미세조직 및 기계적 물성 변화 연구
Hoseop Song, Sung Ho Song, Jaiyoung Cho, Gian Song
송호섭, 송성호, 조재영, 송기안
Korean J. Met. Mater. 2023;61(6):449-457.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.449

Abstract
High entropy alloys (HEAs) are defined as a multi-element alloy including more than 4 elements with near equi-atomic percentage. In general, the configurational entropy of the HEAs is known to be sufficient to stabilize a single solid solution, such as body-centered cubic (BCC), face-centered cubic (FCC) and hexagonal-closed pack (HCP)...... More

                   Web of Science 1  Crossref 2
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