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Volume 56(4); Apr 2018
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Review paper
253 How to Utilize Computational Materials Science in the Metals and Materials Community – An Overview
금속·재료 분야 전산재료과학 사용설명서
Byeong-Joo Lee
이병주
Korean J. Met. Mater. 2018;56(4):253-264.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.253

Abstract
Computational approaches such as first-principles calculations, atomistic simulations, phase field simulations, computational thermodynamics and finite element method simulations are widely used in the metals and materials community. Even with their successful applications for better understanding of material phenomena, and the design of new materials or processes, a gap remains between..... More

      
Research Papers
265 Effect of Thermo-mechanical Treatment on the Formation Behavior of Martensite in 316L Stainless Steel
316L 스테인리스강에서 마르텐사이트 생성거동에 미치는 가공열처리의 영향
Jong-Sig Kim, Jae-Nam Kim, Chang-Yong Kang
김종식, 김재남, 강창룡
Korean J. Met. Mater. 2018;56(4):265-271.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.265

Abstract
This study was carried out to investigate the effect of thermo-mechanical treatment on the formation behavior of martensite in 316L stainless steel. Dislocation, α' and ε-martensite were formed by thermo-mechanical treatment. Martensite with surface relief and specific direction was formed by thermo-mechanical treatment. Martensite formed by thermo-mechanical treatment were reversed..... More

      
272 High-temperature Corrosion of CrAlSiN Thin Films in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2018;56(4):272-279.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.272

Abstract
Cr25.2Al19.5Si4.7N50.5 thin films were deposited on steel substrates by cathodic arc plasma deposition. They consisted of alternating fcc-Cr(Al)N/hcp-Al(Cr,Si)N nanolayers. They were corroded at 900 and 1000 oC for 5-100 h in N2/0.1%H2S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during..... More

      
280 Effects of Heat Treatment and Thermal Cycle Conditions on the Bonding Strength and Interfacial Characteristics of Electroplated Cr/Electroplated Ni-P Coatings
열처리 및 열 사이클 조건에 따른 전해 Cr/전해 Ni-P 도금의 접합강도 평가 및 계면분석
Jina Lee, Kirak Son, Myung-Hee Choi, Kyu Hwan Lee, Young-Bae Park
이진아, 손기락, 최명희, 이규환, 박영배
Korean J. Met. Mater. 2018;56(4):280-288.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.280

Abstract
The effects of heat treatment and thermal cycle conditions on the bonding strength and interfacial characteristics of electroplated Cr/electroplated Ni-P coatings were systematically evaluated. With step1 samples, heat treatment was performed at 750 oC for 6 hours after successive electroplating of Ni-P and Cr layers. With step2 samples, 1st heat..... More

      
289 Effect of Oxi-Nitrocarburizing on the Microstructure, Nanohardness and Corrosion Properties for Low Carbon Steel
산질화처리가 저탄소강의 미세조직과 나노경도 및 부식특성에 미치는 영향
Young-Wook Cho, Jong-Ho Won, Jeong-Ho Woo, Sang-Ho Yu, Young-Rae Cho
조영욱, 원종호, 우정호, 유상호, 조영래
Korean J. Met. Mater. 2018;56(4):289-295.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.289

Abstract
Oxi-nitrocarburizing treatment was performed to improve the anti-corrosion and anti-wear properties of low carbon steels. The oxi-nitrocarburizing was carried out in 2 steps: a gas nitrocarburizing step at 560 ℃ and an oxidation step at 550 ℃ for 30 min with steamed water. The mechanical and chemical properties of the..... More

      
296 Effects of Thermal Aging Induced Microstructure Evolution on Mechanical and Corrosion Properties of Delta-Ferrite in Austenitic Stainless Steel Weld
오스테나이트계 스테인리스강 용접부 델타-페라이트의 열화에 따른 미세조직 변화가 기계적 물성 및 부식 특성에 미치는 영향
Sang Kyu Park, Ho Jung Lee, Jong Hyeon Lee
박상규, 이호중, 이종현
Korean J. Met. Mater. 2018;56(4):296-303.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.296

Abstract
347 austenitic stainless steel weld (ASSW) was thermally aged at 343, 400 and 450 °C up to 20,000 h in this study. Effects of thermal aging induced microstructure evolution on the mechanical properties and corrosion resistance of delta-ferrite in the 347 ASSW were qualitatively and quantitatively assessed by high resolution..... More

      
304 Enhanced Electrical Properties and Stability of Solution-processed Amorphous Oxide Thin Film Transistors with Multi-active Layers
Won Seok Choi, Byung Jun Jung, Myoung Seok Kwon
Korean J. Met. Mater. 2018;56(4):304-312.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.304

Abstract
We investigated the electrical properties and gate bias stress stability of solution-processed amorphous oxide thin film transistors (TFTs) with multi-stacked active layers. With the multi-layered InZnO (In:Zn = 1:1), mobility was increased from 4.6 to 21.2 cm2V-1s-1 and the subthreshold swing (SS) was improved from 0.71 to 0.54 V/decade compared..... More

      
313 Encapsulation of a Flexible OLED Using a Sealing Line
실링라인을 이용한 플렉시블 OLED 봉지
Cheol-Hee Moon
문철희
Korean J. Met. Mater. 2018;56(4):313-320.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.313

Abstract
Encapsulation of the flexible OLED devices requires a low temperature process and great barrier characteristics against the permeation of water vapor and oxygen. We suggest a new OLED encapsulation method for the flexible OLED device using a sealing line instead of the TFE encapsulation. For the experiments, polyimide substrate with..... More

      
321 Evolution of Hole Transport/Perovskite Layer Properties with Au Evaporation Condition in a Perovskite Solar Cell
페로브스카이트 태양전지의 Au 열증착 조건에 따른 Hole Transport/Perovskite 층의 물성변화
Kwangbae Kim, Taeyeul Park, Ohsung Song
김광배, 박태열, 송오성
Korean J. Met. Mater. 2018;56(4):321-326.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.321

Abstract
Changes in the properties of the hole transport layer (HTL) and the perovskite layer in a perovskite solar sell (PSC) were observed under various Au thermal evaporation conditions. We employed a conventional thermal evaporator with a distance of 30 cm between the source and substrate in a vacuum of 6..... More

      
327 Effect of Additives on the Sand Burning of Inorganic Binder in Al-Si7Mg Alloy Casting
물유리계 바인더의 첨가제가 Al-Si7Mg 합금 주조 시 소착에 미치는 영향
Min A Bae, Myung Hwan Kim, Jeong-Wook Park, Man Sig Lee
배민아, 김명환, 박정욱, 이만식
Korean J. Met. Mater. 2018;56(4):327-333.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.327

Abstract
Traditional organic binders used by the foundry industry produce problems such as generation of volatile organic compounds(VOCs), smoke and etc. A water glass binder system has been developed to improve the casting strength and to solve the environmental problems. However the water glass binder has a serious problem of sand..... More

      
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