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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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Visualization of Magnetic Domains in Electrical Steel Using High-Resolution Dark-Field Imaging
Youngju Kim, Jongyul Kim, Daniel Seth Hussey, Oh Youl Kwon, Seung Wook Lee
Korean J. Met. Mater.
2019;57(6):352-359. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.352
Abstract
Electrical steel is a soft magnetic steel material used in electric devices such as transformers and motors. The performance of these electric devices is primarily related to the magnetic properties of electrical steel, and the assessment of the magnetic properties of electrical steel has been considered an important topic. We.....
More
Web of Science 4
Crossref 2
Room and Elevated Temperature Compressive Deformation Behavior of AISI 316L Alloy Fabricated by Selective Laser Melting Process
Selective laser melting 공정으로 제조된 AISI 316L 합금의 상온 및 고온 압축 변형 거동
Gi-Su Ham, Soon-Hong Park, Kee-Ahn Lee함기수, 박순홍, 이기안
Korean J. Met. Mater.
2019;57(5):295-303. Published online 2019 May 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.5.295
Abstract
This study investigated the microstructure and compressive properties (at room & high temperatures) of Fe-Cr-Ni based AISI 316L alloy, manufactured by selective laser melting process. The effect of stress relieving heat treatment on the microstructure and mechanical properties also examined. Regardless of the stress relieving heat treatment, the SLMed AISI.....
More
Web of Science 3
Crossref 3
Flexible OLED Encapsulation with LMPA Line
저융점합금 라인을 이용한 플렉시블 OLED 봉지
Geon Bae, Cheol-Hee Moon배건, 문철희
Korean J. Met. Mater.
2019;57(4):251-257. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.251
Abstract
We have developed an encapsulation technology for OLED devices using an LMPA sealing line to enhance barrier characteristics against moisture and oxygen penetration. To verify the potential of this technology for flexible OLED devices, three experimental factors were investigated in this study. First, the stability of the sealing line on.....
More
Anisotropy in Green Body Bending Strength due to Additive Direction in the Binder-Jetting Additive Manufacturing Process
Ji-Won Oh, Sahn Nahm, Byoungmoon Kim, Hanshin Choi
Korean J. Met. Mater.
2019;57(4):227-235. Published online 2019 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.4.227
Abstract
The additive manufacturing (AM) process is a production technology process that has recently attracted attention. Among AM processes, the binder jetting (BJ) method is advantageous because it allows both wide material selection and design freedom. However, the output arrangement, which determines the direction in which the binder is injected during.....
More
Web of Science 16
Crossref 19
Study of the Corrosion Behaviour, Liquid Metal Embrittlement and Resistance Spot Weldability of Galvannealed Hot Stamping Steel
합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
Yeonjung Hwang, Chang Wook Lee, Ga-Young Shin, Ji Hong Yoo, Minsu Choi황연정, 이창욱, 신가영, 유지홍, 최민수
Korean J. Met. Mater.
2019;57(3):193-201. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.193
Abstract
The hot stamping process is beneficial for fabricating high strength automotive parts without spring back. To suppress high temperature oxidation and decarburization, it is necessary to coat the hot stamping steel. In the present work, the performance of galvannealed coated (GA) hot stamped steel was evaluated. During cyclic corrosion tests,.....
More
Web of Science 6
Crossref 7
Effect of Cr Electroplating Layer Thickness on the Tensile and High Cycle Fatigue Properties of AISI 1045 Steel
AISI 1045 강의 인장 및 고주기 피로 특성에 미치는 Cr 도금층 두께의 영향
Gi-Su Ham, Yeon-Ji Kang, Hyung-Jun Kim, Sang-Hoon Yoon, Kee-Ahn Lee함기수, 강연지, 김형준, 윤상훈, 이기안
Korean J. Met. Mater.
2019;57(3):138-145. Published online 2019 Feb 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.138
Abstract
This study investigated and compared the tensile and high-cycle fatigue properties of AISI 1045 steel and Cr electroplated AISI 1045 steel. First, tensile and fatigue specimens were machined from AISI 1045 steel (substrate), and two kinds of Cr electroplating layers with different layer thickness were applied. The substrate, AISI 1045.....
More
Web of Science 3
Crossref 3
Oxidation Behaviors of Alloys Containing β/B2 Phases of Ti-45Al-Mo-Nb Alloys and Evaluation of the Oxidation Behaviors of Si Pack Cementation Coated Alloys
β
/B2상을 포함한 Ti-Al-Mo-Nb 합금의 산화 거동과 실리콘 화합물 코팅을 통한 내산화성 개선
Kwangsu Choi, Youngbuem Song, Seonghoon Yi, Joon Sik Park최광수, 송영범, 이승훈, 박준식
Korean J. Met. Mater.
2019;57(3):131-137. Published online 2019 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2019.57.3.131
Abstract
Alloys containing the β/B2 phases of Ti-45Al-3Mo, Ti-45Al-3Mo-2Nb and Ti-45Al-5Mo were prepared using an vacuum arc-melting machine. Heat-treatments were carried out at 1250 oC in an Ar atmosphere. The temperature of 1250 oC is the temperature region of phase α + γ + (β/B2), and the heat treatment condition which.....
More
Web of Science 2
Crossref 2
Corrosion Resistance and Adhesion of Paint Coating Film on Zn-Mg-Al Hot-Dip Galvanized Steel Sheets
아연-마그네슘-알루미늄 합금도금강판의 도장 내식성 및 밀착성
Jae-Won Lee, Bora Park, Sung Jin Kim이재원, 박보라, 김성진
Korean J. Met. Mater.
2019;57(2):77-83. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.77
Abstract
Zn-Al-Mg alloy galvanized steel sheets have excellent corrosion resistance and improved cut-edge corrosion resistance. Most of the galvanized steel sheets used for outdoor applications are coated again on the galvanizing layer, or after a plastic film is laminated. As the corrosion products formed by the corrosion of Zn accumulate over.....
More
Web of Science 10
Crossref 7
Influence of Boron and Manganese on Hot Crack Resistance and Low Temperature Toughness of Flux Cored Arc Weld Metal for High Strength Carbon Steels
고강도 탄소강 FCA 용착금속의 고온균열 저항성과 저온 충격인성에 미치는 보론과 망간의 영향
Su-Kil Park, Young-Ho Cho, Chun-Ho Jee, Junghoon Lee, Seong-Moon Seo, Namhyun Kang박수길, 조영호, 지춘호, 이정훈, 서성문, 강남현
Korean J. Met. Mater.
2019;57(1):28-37. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.28
Abstract
The hot crack resistance and mechanical properties of flux cored arc (FCA) welds were investigated with three kinds of welding consumables having different boron (B) and manganese (Mn) contents for high strength carbon steel. The hot crack resistance, measured from self-restraint testing, strongly depended on the amount of B in.....
More
Web of Science 3
Crossref 3
Pattern Formation of Highly Ordered Sub-20 nm Pt Cross-Bar on Ni Thin Film
Ni 박막 위 20 nm급 고정렬 Pt 크로스-바 구조물의 형성 방법
Tae Wan Park, Hyunsung Jung, Young-Rae Cho, Jung Woo Lee, Woon Ik Park박태완, 정현성, 조영래, 이정우, 박운익
Korean J. Met. Mater.
2018;56(12):910-914. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.910
Abstract
Since catalyst technology is one of the promising technologies to improve the working performance of next generation energy and electronic devices, many efforts have been made to develop various catalysts with high efficiency at a low cost. However, there are remaining challenges to be resolved in order to use the.....
More
Crossref 3
Rosette Strain Sensors Based on Stretchable Metal Nanowire Piezoresistive Electrodes
신축성 금속 나노선 압저항 전극 기반 로젯 스트레인 센서
Kang-Hyun Kim, Jae-Gyeong Cha, Jong-Man Kim김강현, 차재경, 김종만
Korean J. Met. Mater.
2018;56(11):835-843. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.835
Abstract
In this work, we report a delta rosette strain sensor based on highly stretchable silver nanowire (AgNW) percolation piezoresistors. The proposed rosette strain sensors were easily prepared by a facile twostep fabrication route. First, three identical AgNW piezoresistive electrodes were patterned in a simple and precise manner on a donor.....
More
Crossref 1
Effect of Alloying Elements on the Thermal Conductivity and Casting Characteristics of Aluminum Alloys in High Pressure Die Casting
고압 다이캐스팅용 알루미늄 합금의 열전도성 및 주조성에 미치는 첨가원소의 영향
Cheol-Woo Kim, Young-Chan Kim, Jung-Han Kim, Jae-Ik Cho, Min-Suk Oh김철우, 김영찬, 김정한, 조재익, 오민석
Korean J. Met. Mater.
2018;56(11):805-812. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.805
Abstract
High pressure die casting is one of the precision casting methods. It is highly productivity and suitable for manufacturing components with complex shapes and accurate dimensions. Recently, there has been increasing demand for efficient heat dissipation components, to control the heat generated by devices, which directly affects the efficiency and.....
More
Crossref 9
Effect of BN Addition on the Mechanical Properties of TiN-BN Composites
Woo-Jin Cho, In-Jin Shon
Korean J. Met. Mater.
2018;56(9):658-663. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.658
Abstract
Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its.....
More
Crossref 16
Characteristics of Electroless Sn Plating Electrolyte using a Choline Chloride-Based Ionic Liquid
Chieon Park, Bongyoung Yoo, Joonkyun Lee
Korean J. Met. Mater.
2018;56(9):645-651. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.645
Abstract
In the present study, a choline chloride(ChCl)-based ionic liquid(IL) was used as an electrolyte to confirm the characteristics of electroless tin plating. The effect of the type of additive and reducing agent, as well as the addition of complexing agent and water, on the properties of the ChCl-based IL, including.....
More
Crossref 4
Investigation of Local Deformation Behaviour of Metallic Materials and Recent Research Trends: A Review
금속 재료의 국부 변형 거동 분석 방법과 연구 동향: 리뷰
Min-su Lee, Jong Bae Jeon, Tea-Sung Jun이민수, 전종배, 전태성
Korean J. Met. Mater.
2018;56(9):635-644. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.635
Abstract
The behaviour and performance of complex metallic materials (e.g., advanced high strength steel and dual phase Ti alloys) are acknowledged to be multi-scale in nature and to rely on the details of the threedimensional morphology, chemistry and crystallography at the meso-scale level and on macro-scale level geometry and boundary and.....
More
Crossref 6
Evaluation on Reheat Cracking of Multi-pass Weld Metal of YP 690 QT Steel
해양플랜트용 YP 690 MPa급강 다층 용접부의 재열 균열 특성 평가
Yong Taek Shin, Young Ju Jo신용택, 조영주
Korean J. Met. Mater.
2018;56(8):580-588. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.580
Abstract
This study evaluated the relationship between reheat cracking that occurs in the reheated weld zone formed by subsequent multi-pass welding and the preheat/interpass temperature. The multi-pass weldment was YP 690 MPa high-strength steel, which is used in mobile offshore platform units. The welding process was flux-cored arc welding (FCAW), which.....
More
Effect of Gelatin and Chloride Ions on the Mechanical Properties and Microstructural Evolution of Copper Foil
젤라틴 및 염소이온 첨가에 의한 구리 박막의 미세조직 및 기계적 특성 고찰
Tae-Gyu Woo, Man-Hyung Lee, Kyeong-Won Seol우태규, 이만형, 설경원
Korean J. Met. Mater.
2018;56(7):518-523. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.518
Abstract
This study investigated the crystal structure and mechanical properties of copper foil electroplated by adjusting gelatin and chloride ions from 0 to 100 ppm. There was increased formation of spherical crystals and surface roughness on the surface of the electroplated layer when the gelatin was added, and the direction of.....
More
Crossref 4
Main Effects of Plating Parameters on Mechanical and Surface Properties of Electroplated Copper
구리 전해도금 변수의 기계적 특성 및 표면 특성에 미치는 주 효과 분석
Tae-Gyu Woo, Il-Song Park, Kyeong-Won Seol우태규, 박일송, 설경원
Korean J. Met. Mater.
2018;56(6):459-464. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.459
Abstract
Electroplated copper has been used as wiring in electronic circuit boards and as cathode materials for secondary batteries, and its usage has expanded into the construction industry because of its convenient production and high economic value. During the electroplating process, various parameters, such as crystal phase and size, can affect.....
More
Crossref 1
Effect of Via Pitch on the Extrusion Behavior of Cu-filled TSV
Seho Kee, Wonjoong Kim, Jaepil Jung, Minhyung Choi
Korean J. Met. Mater.
2018;56(6):449-458. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.449
Abstract
In this study, the extrusion behavior of Cu fill material in a through-Si-via (TSV) subjected to thermal loading was investigated. The Cu filling of the TSV was accomplished using pulse periodic reverse (PPR) electroplating. To study the extrusion, TSVs of varying via pitch were filled with Cu by electroplating. Defect-free Cu.....
More
Crossref 4
A Study on Micro-Structure and Wear Behavior of AISI M4 and CPM15V Deposited by Laser Melting
레이저 용융 적층 기술을 이용한 AISI M4와 CPM15V 분말 적층부의 미세 조직 및 마모 특성에 관한 연구
Gyeong Yun Baek, Gwang Yong Shin, Ki Yong Lee, Do Sik Shim백경윤, 신광용, 이기용, 심도식
Korean J. Met. Mater.
2018;56(6):430-439. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.430
Abstract
AISI M4 and CPM15V are used as tool steels since they have high hardness and wear resistance. This study is concerned with die and mold hardfacing using laser melting deposition with M4 and CPM15V powders. For this purpose, the two types of metal powders were deposited on SKD11 base metal,.....
More
Crossref 5
Evaluations of Hydrogen Permeation on Ni-SCYb Nano-Composites Membrane by Sol-Gel Methods
Min Gyeom Kim, Tae Whan Hong
Korean J. Met. Mater.
2018;56(5):406-411. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.406
Abstract
Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA). However, the PSA process involves an exothermic reaction during adsorption. Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or.....
More
Crossref 1
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 Lee배민아, 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
Crossref 3
Encapsulation of a Flexible OLED Using a Sealing Line
실링라인을 이용한 플렉시블 OLED 봉지
Cheol-Hee Moon문철희
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
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 Park이진아, 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
o
C for 6 hours after successive electroplating of Ni-P and Cr layers. With step2 samples, 1st heat.....
More
Heat Dissipation Analysis of High-Power, Multi-Chip LED Bulbs
고 출력, 멀티 칩 LED 벌브에서 방열 거동 해석
Cheol-Hee Moon문철희
Korean J. Met. Mater.
2018;56(3):227-234. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.227
Abstract
To ensure the reliability of high-power light-emitting diode (LED) bulbs, temperature management is very important, including reduction of the junction temperature on the LED chip and enhancing outward thermal dissipation. Simulation can be an effective tool for predicting the temperature distribution over all bulbs, which enables a quantitative analysis. In.....
More
Crossref 1
Microstructure of Rhenium Coatings Deposited by CVD on Graphite and Mo Substrates
흑연 및 Mo 기판 위에 CVD 성장된 Re 코팅층의 미세조직
Sun Kyu Lee, Dong Yun Nam, Nam Ho Bae, Sung Taek Lim, Yong-Jun Oh이선규, 남동윤, 배남호, 임성택, 오용준
Korean J. Met. Mater.
2018;56(3):197-204. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.197
Abstract
Rhenium coatings were fabricated on a graphite substrate at 1100 and 1250
o
C and a molybdenum substrate at 1150 and 1250
o
C by chemical vapor deposition (CVD) using ReCl5 precursor, and the effects of deposition temperatures and substrates on microstructure and crystal orientation were investigated. The rhenium coating on graphite.....
More
Effects of Feedstock Powder Characteristics on the Microstructural Features and Erosion Resistance of WC-12Co Coatings
분말소재 특성에 따른 고속화염용사 WC-12Co 코팅층의 미세조직 및 침식 저항성
So-Yeong Kang, Kyeong-Ho Baik, Sang-Hoon Yoon, Hyung-Jun Kim강소영, 백경호, 윤상훈, 김형준
Korean J. Met. Mater.
2018;56(2):113-120. Published online 2018 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.2.113
Abstract
WC-Co coatings manufactured by high velocity oxy-fuel (HVOF) spraying have a superior hardness and wear resistance. In this study, HVOF-sprayed WC-12Co coatings from three different feedstock powders were evaluated in terms of microstructural features, carbide decomposition and erosion resistance. The fused-crushed and the sintered-crushed WC-12Co powders had an angular shape,.....
More
Crossref 1
Study on the Part Unit Corrosion Evaluation for Automotive Lower Arm Using Electrochemical Cyclic Corrosion Test
전기화학적 순환부식 시험법을 활용한 자동차 로어암의 단품단위 부식평가에 관한 연구
Seon-Hong Kim, Ji-Hoon Lee, Jung-Gu Kim, Min Jang김선홍, 이지훈, 김정구, 장민
Korean J. Met. Mater.
2018;56(2):103-112. Published online 2018 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.2.103
Abstract
This research focused on the development of the part unit evaluation for an organic coated automotive lower arm using the electrochemical cyclic corrosion test (E-CCT). The E-CCT accelerates both the coating degradation and the perforation corrosion. The applied potential for the coating degradation was determined to be -500 mV
SCE
for.....
More
Recovery of Fine Aluminum Hydroxide with High Whiteness Index from Low Quality Bauxite Using Caustic Roasting and Water Leaching
Su Jin Kim, Jeong Il Lee, Kyu Sung Han, So Yeong Byun, Tam Tran, Myong Jun Kim
Korean J. Met. Mater.
2018;56(1):49-58. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.49
Abstract
A bauxite of low quality containing 6.75% reactive silica and 37.4% Al
2
O
3
as gibbsite was roasted with additives including NaOH (caustic/total alumina molar ratio of 2-4:1) and CaO (CaO/total SiO
2
molar ratio of 0.5-3:1) at 300-1000 oC, producing calcines containing sodium aluminate (Na2O.Al
2
O
3
), silicates and hematite. Optimum conditions included roasting.....
More
Crossref 2
Study on the Water Durability of Molybdate Glasses with B
2
O
3
as Low Temperature Sealing Materials
Jae-Young Shin, Jae-Min Cha, Dae-Sung Kim, Dea-Geol Jeong, Jun-Hyeon Bae, Bong-Ki Ryu
Korean J. Met. Mater.
2017;55(12):905-910. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.905
Abstract
The boron alkali molybdate glass system was investigated as lead-free low-temperature melting sealing materials, with different boron oxide contents between 0 and 8 mol%. The glasses were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and by densities. Their chemical properties were measured by their dissolution.....
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