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Research Papers
873 Evaluation and Prediction of Formation of Heat-Affected Zone and Mechanical Properties According to Welding Method of STS 316L/A516-70N Clad Plates
STS 316L/A516-70N 클래드 판재의 용접방법에 따른 열영향부 형성과 기계적 물성 특성 평가 및 예측
Cheolhong Hwang, Myungwoo Joe, Sunhwan Kim, Doohee Han, Kyunghoon Yoo, Sungwoong Kim, Youngjoo Kim, Sangyeob Lee, Joonsik Park
황철홍, 조명우, 김선환, 한두희, 유경훈, 김성웅, 김영주, 이상엽, 박준식
Korean J. Met. Mater. 2022;60(12):873-883.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.873

Abstract
Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and FCAW + GTAW (Gas tungsten arc welding) were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the welding speed of the FCAW + GTAW welding method is slower than that of the FCAW + FCAW..... More

      
884 Discrepancies in Nanoindentation Hardness and Modulus with a Berkovich, a Cube-corner, and a Conical Tip in a Cu(In,Ga)Se2 Light-Absorption Layer
Berkovich 압자와 Cube-corner 및 Conical shape 압자를 이용해서 얻은 Cu(In,Ga)Se2 광흡수층 박막의 탄성계수 및 경도의 불일치에 대한 고찰
Yeojin Kang, Wonjung Park, Mao Zhang, Dayoung Yoo, Dongyun Lee
강여진, 박원정, 장마오, 유다영, 이동윤
Korean J. Met. Mater. 2022;60(12):884-891.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.884

Abstract
In this study, we tried to understand the difference in the mechanical properties (elastic modulus, E & hardness, H) values of CIGS compound semiconductors measured using the Berkovich indenter and the sharper cube corner and conical indenter. Adopted continuous stiffness measurement technique to characterize it along with the indentation depth...... More

      
892 Effect of Initial Microstructure on the High-Temperature Formability of STS 321 Alloy Using a Dynamic Material Model
동적재료모델을 활용한 STS 321 스테인리스강의 고온성형성 평가와 초기 미세조직의 영향
Pyeong-Seok Jo, Jae-Gwan Lee, Hyo-Woon Hwang, Yong-Jae Lee, Dong-Geun Lee
조평석, 이재관, 황효운, 이용재, 이동근
Korean J. Met. Mater. 2022;60(12):892-901.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.892

Abstract
General austenitic stainless steel has a problem with intergranular corrosion due to volatilizing chromium, which forms chromium carbide in a high temperature environment. By adding titanium as an alloying element, STS 321 stainless steel has excellent creep resistance and intergranular corrosion resistance at high temperatures, because the formation of chromium..... More

      
902 Ion Exchange for the Purification of Co(II) or Ni(II) from Acidic and Ammonia Solutions in the Recycling of Spent Lithium-Ion Batteries
Thanh Tuan Tran, Man Seung Lee
Korean J. Met. Mater. 2022;60(12):902-911.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.902

Abstract
The recycling of critical metals like cobalt and nickel from spent lithium-ion batteries (LIBs) is of immense importance in sustainable manufacturing. This work aims to purify Co(II) and Ni(II) present in acidic and ammonia solutions using ion exchange. AG-1-X8 resin modified with thiocyanate anions (R4N+SCN resin) was used to separate..... More

      
912 Thermoelectric Properties of Cu-added Polycrystalline Bi2O2Se Oxyselenide
Si-young Bae, Se Woong Lee, Hyun-Sik Kim, Okmin Park, Hyunjin Park, Won-Seon Seo, Sang-il Kim
Korean J. Met. Mater. 2022;60(12):912-918.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.912

Abstract
Bi2O2Se oxyselenide has been actively studied as a potential n-type thermoelectric material because of its intrinsically low thermal conductivity and high Seebeck coefficient (S). However, Bi2O2Se has very low electrical conductivity (σ), resulting in relatively poor thermoelectric performance. Herein, we investigate the effect of Cu addition on the electrical and..... More

      
919 Electrical, Thermal, and Thermoelectric Transport Properties of Se-doped Polycrystalline Re2Te5
Se Woong Lee, Okmin Park, Hyun-Sik Kim, Won-Seon Seo, Sang-il Kim
Korean J. Met. Mater. 2022;60(12):919-925.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.919

Abstract
Re2Te5 is considered a potential thermoelectric material because of its intrinsically low thermal conductivity, due to its complex crystal structure. Herein, a series of Se-doped Re2Te5 (Re2Te5-xSex, x = 0, 0.2, 1, and 2) samples were synthesized, and their electrical and thermal transport properties were investigated. Pure orthorhombic Re2Te5 phases..... More

      
926 Transition to n-type Thermoelectric Conduction in Ni-doped FeSe2 Alloys
Young Bin An, Sang Jeong Park, Okmin Park, Sang-il Kim
Korean J. Met. Mater. 2022;60(12):926-932.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.926

Abstract
We investigated the effect of Ni doping on the electrical, thermal, and thermoelectric transport properties of FeSe2 polycrystalline alloys. FeSe2 alloys exhibit both n-type and p-type conduction at different temperatures and thus their practicality as a thermoelectric material is somewhat limited. In this study, Fe1-xNixSe2 polycrystalline samples with x =..... More

      
933 Effect of Metal Film Thickness on Strain-Sensing Performance of Crack-Based Stretchable Hybrid Piezoresistive Electrode
금속 박막 두께가 크랙 기반 신축성 하이브리드 압저항 전극의 스트레인 감지 특성에 미치는 영향
Ji-Yeon Noh, Mirae Kim, Jong-Man Kim
노지연, 김미래, 김종만
Korean J. Met. Mater. 2022;60(12):933-939.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.933

Abstract
In recent decades, many research efforts have been devoted to developing high-performance stretchable strain sensors due to their potential for application in various emerging wearable sensor systems. This work presents a facile yet highly efficient way of modulating the sensing performance of a thin metal film/conductive composite hybrid piezoresistor-based stretchable..... More

      
940 Effect of Grain Boundary Morphology on the High Temperature Tensile Properties of Developed Ni-Based Superalloy (LESS)
Ni기 초내열 개발 합금(LESS)의 고온 인장특성에 미치는 결정립계 형상의 영향
Yong Kwan Shin, Byung Il Kang, Jeong IL Youn, Yong Nam Kwon, Young Jig Kim
신용관, 강병일, 윤정일, 권용남, 김영직
Korean J. Met. Mater. 2022;60(12):940-949.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.940

Abstract
In order to investigate the mechanical properties of the developed wrought γ'-hardened Ni-based superalloy, LESS alloy (Low Eta Sigma Superalloy), and to understand the deformation behavior, tensile tests were carried out from room temperature to 800oC in comparison with IN 740H alloy. Like other superalloys, the tensile properties of the..... More

      
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