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Transforming Carbon Black into Graphene Oxide Quantum Dots by Pulsed Laser Ablation in Ethanol
Jung-Il Lee, Jeong Ho Ryu
Korean J. Met. Mater. 2020;58(11):808-814.   Published online 2020 Oct 21
DOI: https://doi.org/10.3365/KJMM.2020.58.11.808

Graphene oxide quantum dots (GOQDs) are nanometer-sized graphene oxide fragments that exhibit unique properties, making them interesting candidates for a range of new applications. Carbon black, one of the commercially available carbon precursors, is produced by the thermal decomposition or incomplete combustion of organic compounds. It is commonly used as..... More

Facile Synthesis of Single-Phase Alpha-Tungsten Nanopowders from Ammonium Paratungstate by RF Induction Thermal Plasma and Thermochemical Reduction
Dongyoon Shin, Hyun-Woo Shim, Basudev Swain, Kyung-Soo Park, Chan-Gi Lee
Korean J. Met. Mater. 2020;58(11):798-807.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.798

Facile, economic methods of preparing tungsten (W) nanopowder are critically needed to meet industrial demand. Herein, we report a method of preparing single-phase alpha-W (α-W) nanopowders using ammonium paratungstate (APT) as a starting material and the optimum synthesis conditions. The process involves two stages: i) the radio-frequency (RF) induction thermal..... More

Enhanced Optical and Electrical Properties of Ti Doped In<sub>2</sub>O<sub>3</sub> thin Films Treated by Post-deposition Electron Beam Irradiation
Su-Hyeon Choe, Yun-Je Park, Yu-Sung Kim, Byung-Chul Cha, Sung-Bo Heo, Sungook Yoon, Young-Min Kong, Daeil Kim
Korean J. Met. Mater. 2020;58(11):793-797.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.793

Transparent and conductive Ti doped In2O3 (TIO) films were prepared on slide glass substrate using a radio frequency (RF) magnetron sputter and then subjected to Transparent and conductive Ti doped In2O3 (TIO) films were prepared on a glass slide substrate using radio frequency (RF) magnetron sputter. The film surface was..... More

A Study on the Influence of Laser Power on the Microstructure and Mechanical Properties of Functionally Graded Materials Produced by Direct Energy Deposition
고에너지 직접 적층법으로 제조된 경사조성재료의 미세조직 및 기계적 특성에 미치는 레이저 출력의 영향 연구
Giseung Shin, Ji hyun Yoon, Dae Whan Kim, Yongho Park, Jeoung Han Kim
신기승, 윤지현, 김대환, 박용호, 김정한
Korean J. Met. Mater. 2020;58(11):782-792.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.782

This study investigated the effects of laser power on the microstructure and mechanical properties of functionally gradient materials (FGM) produced by direct energy deposition. The FGM consisted of five different layers, which were a mixture of austenitic stainless steel (Type 316L) and ferritic steel (HSLA). During the direct energy deposition,..... More

Tensile and Compressive Deformation Behaviors of High-Strength Cu Bulk Material Manufactured by Cold Spray
저온 분사 공정으로 제조된 초고강도 Cu 벌크 소재의 인장 및 압축 변형 거동
Young-Kyun Kim, Kee-Ahn Lee
김영균, 이기안
Korean J. Met. Mater. 2020;58(11):759-767.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.759

In this study, high-strength pure Cu bulk material was manufactured using a cold spray additive manufacturing process, and its microstructure, tensile and compressive deformation behaviors were investigated and compared. The cold spray additive manufactured Cu bulk material showed a heterogeneous grain structure consisting of fine-grains and coarse-grains, and only α..... More

Development of a Novel Plastic Hardening Model Based on Random Tree Growth Method
랜덤 트리 성장을 이용한 소성 경화 모델 개발방법 및 새로운 모델 제안
Hyoung-Seo Son, Young-Gon Kim, Jin-Jae Kim, Young-Suk Kim
손형서, 김영곤, 김진재, 김영석
Korean J. Met. Mater. 2020;58(11):741-751.   Published online 2020 Oct 21
DOI: https://doi.org/10.3365/KJMM.2020.58.11.741

The flow functions for plastic deformation have been developed to describe the plastic behavior of sheet metals. In order to explain the plastic behavior of material in metal forming processes via finite element analyses, two basic input functions should be applied. One is the yield function that determines the yielding..... More

KIST-NOMAD - a Repository to Manage Large Amounts of Computational Materials Science Data
Samuel Boateng, Kwang Ryeol Lee, Deepika , Haneol Cho, Kyu Hwan Lee, Chansoo Kim
Korean J. Met. Mater. 2020;58(10):728-739.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.728

We introduce the Korea Institute of Science and Technology-Novel Materials Discovery (KISTNOMAD) platform, a materials data repository. We describe its functionality and novel features from an academic viewpoint. It is a data repository designed for computational material science, especially focusing on managing and sharing the results of molecular dynamics simulation..... More

Effects of Initial Precipitate on Shear Deformation during Asymmetric Rolling of Al-Mg-Si Alloy: Texture and Formability
Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성
Wonkee Chae, Bong-Kyu Kim, Jongbeom Lee, Jun Hyun Han
채원기, 김봉규, 이종범, 한준현
Korean J. Met. Mater. 2020;58(10):703-714.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.703

Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value..... More

Integrity Assessment of Obsolete Thermal Storage Tank in District Heating System
지역난방 노후 축열조의 부식 건전성 평가 및 고찰
Daeho Yun, Hobyung Chae, Heesan Kim, Jung-Gu Kim, Woo Cheol Kim, Tae Baek Ha, Jaehyuk Jang, Joon Cheol Jeong, Soo Yeol Lee
윤대호, 채호병, 김희산, 김정구, 김우철, 하태백, 장재혁, 정준철, 이수열
Korean J. Met. Mater. 2020;58(10):693-702.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.693

The thermal storage tank in a district heating system is a component that stores excess heat during normal operation and releases the stored heat to increase the efficiency of the system, when the heat source is stopped or additional demands occur. Recently, an obsolete thermal storage tank was dismantled for..... More

Effects of Heat Treatment Condition and Counter Materials on the Wear Behavior of Laser Direct Energy Deposited Fe-8Cr-3V-2Mo-2W Alloy
레이저 직접적층법으로 제조된 Fe-8Cr-3V-2Mo-2W합금의 마모특성에 미치는 열처리공정 및 상대재의 영향
Kyeongsik Ha, Young Keun Park, Taehwan Kim, Gyeong Yun Baek, Jong Bae Jeon, Do-sik Shim, Young Hoon Moon, Wookjin Lee
하경식, 박영근, 김태환, 백경윤, 전종배, 심도식, 문영훈, 이욱진
Korean J. Met. Mater. 2020;58(10):680-692.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.680

This study aimed to investigate the wear performance of laser direct energy deposited Fe-8Cr3V-2Mo-2W alloy under various wear environments, in terms of different heat treatment conditions. Ball on disk tribology tests were performed using high-carbon steel and zirconia balls as counter materials. The wear rates of the alloy depended significantly..... More

Effect of Phase Decomposition on Recrystallization in -Zr Region in Zr-2.5%Nb Pressure Tube Material
Zr-2.5%Nb 압력관 재료에서 α-Zr 영역에서의 소둔에 의한 β-상 분해가 재결정에 미치는 영향
SungSoo Kim, Sang Yup Lim, Gyeong-Geun Lee
김성수, 임상엽, 이경근
Korean J. Met. Mater. 2020;58(10):672-679.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.672

The effects of β phase decomposition on recrystallization and texture variation in Zr-2.5% Nb alloy pressure tube material were investigated. Isothermal annealing was conducted at 350 to 550 oC for 240 hours, and isothermal annealing was performed at 500 oC for 240 to 3,000 hours. The recrystallization and texture variation..... More

Hydrogen Induced Cracks in Stainless Steel 304 in Hydrogen Pressure and Stress Corrosive Atmosphere
수소가압 및 응력부식 분위기에서 스테인레스강 SS304의 수소취성균열
Byung Hak Choe, Sang Woo Lee, Jong Kee Ahn, Jinhee Lee, Tae Woon Lim
최병학, 이상우, 안종기, 이진희, 임태운
Korean J. Met. Mater. 2020;58(10):653-659.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.653

The phenomena of hydrogen induced cracking (HIC) in 304 stainless steels was considered in a hydrogen pressure and stress corrosive atmosphere. Microstructures with chloride pits and stress corrosion cracks around the HIC were analyzed by SEM/EDS. Abnormal phase transformations induced by the hydrogen were analyzed using TEM and diffraction. In..... More

Facile Synthesis of ZnO Thin Films at Low Temperatures Using an Additive-Free Electrochemical Oxidation Method
Euije Jo, Dongwan Kim, Jae-Young Leem
Korean J. Met. Mater. 2020;58(9):645-652.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.645

Because of their simplicity and low equipment costs, various oxidation methods can be used to create metal oxides, but they still require long processing times and/or high temperatures. In this study, a new electrochemical oxidation (ECO) method, which oxidizes metal in DI water with a constant flowing current to both..... More

Carburizing Behavior of AISI 4115 Steel According to the Flow Rates of Acetylene in Vacuum Carburizing
AISI 4115 강의 진공 침탄 시 아세틸렌 유량에 따른 침탄 거동
Gi-hoon Kwon, Kyoungil Moon, Young-Kook Lee, Minsu Jung
권기훈, 문경일, 이영국, 정민수
Korean J. Met. Mater. 2020;58(9):617-625.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.617

The vacuum carburizing behavior of AISI 4115 steel according to acetylene flow rates (1, 5, 10, 20, 30, 40, and 50 sccm) and temperatures (900, 950, and 1000 oC) was quantitatively investigated through microstructure, carbon concentration and hardness analyses. As the acetylene flow rate increased, the penetration rate of carbon..... More

Study on Hydrogen Diffusion and Sulfide Stress Cracking Behaviors of Simulated Heat-Affected Zone of A516-65 Grade Pressure Vessel Carbon Steel
A516-65급 압력용기용 강재의 용접모사 열처리를 통한 용접열영향부의 수소확산 및 황화물응력균열 거동 연구
Dong Min Cho, Jin-seong Park, Jin Woo Lee, Sung Jin Kim
조동민, 박진성, 이진우, 김성진
Korean J. Met. Mater. 2020;58(9):599-609.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.599

Hydrogen diffusion and sulfide stress cracking of simulated heat-affected zone (HAZ) of A516- 65 grade steel were examined using an electrochemical permeation technique, glycerin volumetric method, and constant loading method. HAZ samples were fabricated using a metal thermal cycle simulator with a welding heat input of 20, 35, and 50..... More

Short Range Ordering (SRO) Reaction in Ni-base Alloy X-750
Ni-base X-750 합금에서의 단 범위 규칙화 반응
SungSoo Kim, Jung Jong Yeob, Young Suk Kim
김성수, 정종엽, 김영석
Korean J. Met. Mater. 2020;58(9):590-598.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.590

The short range ordering (SRO) reaction of the X-750 Ni-base alloy used as a garter spring material for CANDU reactors was systematically investigated through differential scanning calorimeter (DSC) analysis. Water quenching (WQ) after solution annealing (SA) and 20% cold rolled (CR) X-750 were prepared and these samples were subjected to..... More

Effects of Al-Si Coating Thickness on 22MnB5 in Hot Stamping Wear
Al-Si 도금층 두께가 22MnB5강의 핫스탬핑 공정 마모에 미치는 영향
Min Ki Ji, Hyunsung Son, Jinkeun Oh, Seongwoo Kim, Kyungmok Kim, Tea-Sung Jun
지민기, 손현성, 오진근, 김성우, 김경목, 전태성
Korean J. Met. Mater. 2020;58(8):573-582.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.573

Al-Si coated ultra-high strength steels (UHSS) are widely used in automotive applications because of their high strength-to-weight ratio, corrosion protection and good weldability. The hot stamping (also called hot press forming) process is an effective and suitable technique for producing automotive parts from Al-Si coated UHSS. However, critical issues, such..... More

A Study on the Supersonic Jet Nozzle to Improve of the Operating Efficiency of the Converter Process
전로 공정 조업 효율 향상을 위한 초음속 제트 노즐 연구
Jae-Hong Kwon, Ji-A Lee, Kyeng-Uk Lee, Jeong-Whan Han
권재홍, 이지아, 이경욱, 한정환
Korean J. Met. Mater. 2020;58(8):550-559.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.550

Recently, various worldwide studies have been conducted to improve converter operation by modifying the lance nozzle. In this study, a numerical analysis of the lance nozzle was conducted to improve the dephosphorization efficiency, and to reduce blowing time. The lance nozzle was designed in the form of an abnormal expansion..... More

Evaluation of Transition Temperature in Reactor Pressure Vessel Steels 6using the Fracture Energy Transition Curve from a Small Punch Test
소형펀치 파단에너지 천이곡선을 활용한 원자로용기강의 천이온도 평가
Tae-kyung Lee, Seokmin Hong, Jongmin Kim, Min-Chul Kim, Jae-il Jang
이태경, 홍석민, 김종민, 김민철, 장재일
Korean J. Met. Mater. 2020;58(8):522-532.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.522

The small punch (SP) test is one of the small specimen test techniques, and standardization of the SP test method for evaluating the mechanical properties of metallic materials is in progress. In this study, the impact transition temperature of reactor pressure vessel steels (RPV) in nuclear power plants was estimated..... More

A Further Study on Knoop Indentation Plastic Deformation for Evaluating Residual Stress
Woojoo Kim, Kyungyul Lee, Jong-hyoung Kim, Young-Cheon Kim, Dongil Kwon
Korean J. Met. Mater. 2020;58(8):515-521.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.515

A method for evaluating residual stress using an instrumented indentation test was developed some decades ago. More recently, another method was developed, using a Knoop indenter. The conversion factor ratio, which is one of the key factors in the evaluation algorithm, has been taken to be 0.34, although this value..... More

Microstructures and Oxidation Behaviors of Silicide Coated Nb Alloys by Halide Activated Pack Cementation Process
Halide activated pack cementation에 의한 silicide 코팅층의 형성에 따른 Nb 합금의 산화거동
Wonchul Yang, Choong-Heui Chung, Sangyeob Lee, Kyeong Ho Baek, Youngmoo Kim, Seong Lee, Joon Sik Park
양원철, 정중희, 이상엽, 백경호, 김영무, 이성, 박준식
Korean J. Met. Mater. 2020;58(8):507-514.   Published online 2020 Aug 5
DOI: https://doi.org/10.3365/KJMM.2020.58.8.507

In this study, we tried to improve the oxidation resistance of Nb-12Si (wt%) alloys at 1200 °C or higher through pack cementation coatings. Nb-12Si (wt%) alloys were prepared by arc-melting under Ar atmosphere. When the alloys were coated using pack powder mixtures composed of Si, Al2O3 and NaF, two silicide..... More

Assessment of H<sub>2</sub>O Adsorption Characteristics Based on Zeolite Type
제올라이트 종류에 따른 수분 흡착 특성 평가
Kwangbae Kim, Yesol Lim, Eunseok kim, Saera Jin, Hyunjun Lee, Seonghoon Kim, Yunyoung Noh, Ohsung Song
김광배, 임예솔, 김은석, 진새라, 이현준, 김성훈, 노윤영, 송오성
Korean J. Met. Mater. 2020;58(7):501-506.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.501

The properties and H2O adsorption characteristics of two types of zeolites (3A and 13X) with the same shape but different element composition were identified. These zeolites are used in gas purification processes to manufacture 9N ultra-pure inert gases for semiconductor process applications. To analyze the shape and microstructure of the..... More

Correlations Between Alkali and Crystallinity in lyocell-Based ACF Probed with X-Ray Diffraction
Young Min Jin, Joon Hyuk Lee, Sang Sun Choi
Korean J. Met. Mater. 2020;58(7):495-500.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.495

This study examined the effect of alkalis on lyocell-based activated carbon fibres (ACFs) with high Brunauer-Emmett-Teller (BET) surface areas, using X-ray diffraction (XRD). Here, alkali treatments were conducted using 10 ~ 25 % NaOH and KOH on lyocell samples for 3 h at ambient room temperature. A secondary treatment with..... More

Effect of Pre-Aging Treatment on the Mechanical Properties of Cold Rolled Cu-6 wt% Ni-1.4 wt% Si Alloy
Cu-6 wt% Ni-1.4 wt% Si 합금의 압연 후 기계적 성질에 미치는 시효전 처리 영향
Sang Jin Lee, Hyeon Seok Shin, Eun-Ae Choi, Jee Hyuk Ahn, Yoonsuk Choi, Sangshik Kim, Jehyun Lee, Seung Zeon Han
이상진, 신현석, 최은애, 안지혁, 최윤석, 김상식, 이재현, 한승전
Korean J. Met. Mater. 2020;58(7):488-494.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.488

Cu-Ni-Si alloys were strengthened by Ni2Si intermetallic compound precipitation in a Cu matrix during aging. The Cu-6 wt% Ni-1.4wt%Si alloy was prepared by water quenching (solution treatment) or air cooling (homogenization treatment) after heating 980 oC for 2 hours and aging at 500 oC for 6 hours. After maintaining a..... More

A Study on the Corrosion and Microstructure Characteristics of Early Iron Age Bronze Swords Excavated from Sinpung Site in Wanju, Jeollabuk-Do, Republic of Korea
전북 완주 신풍유적 출토 초기철기시대 동검의 부식 및 제작특성
Min Kyeong Jang, Nam Chul Cho
장민경, 조남철
Korean J. Met. Mater. 2020;58(7):472-479.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.472

The subject of this study was a bronze sword excavated from the early Iron Age area of Sinpung site in Wanju. SEM-EDS, FE-EPMA and Raman Micro-Spectroscopy analysis methods were applied to investigate the manufacturing techniques and corrosion characteristics. The results of the analysis indicated a casting structure composed of both..... More

Effect of Zn-Doping on the Phase Transition Behavior and Thermoelectric Transport Properties of Cu<sub>2</sub>Se
Zn 도핑이 Cu2Se의 상전이 거동과 열전수송특성에 미치는 영향
Seung Hyun Jin, Young Soo Lim
진승현, 임영수
Korean J. Met. Mater. 2020;58(7):466-471.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.466

We report on the phase transition behavior and thermoelectric transport properties of Zn-doped Cu2Se. Cu2Se is comprised of nontoxic, low-cost and abundant elements, and has been attracting attention because of its very high thermoelectric performance, ZT, at high temperatures. Many studies have reported enhanced ZT in impurity doped Cu2Se, however,..... More

Effects of Thiourea Stripping of 14 Karat White Gold Alloys With the Addition of SDS Surfactant
SDS 계면활성제 첨가에 따른 14 캐럿 백색 금합금의 티오우레아 스트리핑의 효과
Ikgyu Kim, Kwangbae Kim, Ohsung Song
김익규, 김광배, 송오성
Korean J. Met. Mater. 2020;58(7):447-452.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.447

A stripping solution with thiourea, iron(III) sulfate, and sodium dodecyl sulfate(SDS) was employed to strip Ni-based 14 karat white gold alloys, and the formation of the NiS byproduct and elimination of passivation were investigated in the presence of 0.0-0.2 g/L SDS. White gold alloy samples with a flat shape were..... More

Optical Properties of CaF<sub>2</sub> Anti-Reflection Coating On ZnS for 8~12 m Infrared Region
CaF2 저반사 코팅된 ZnS 윈도우의 8~12 µm 적외선 영역 광학적 특성
Ill-Joo Lee, Seung-Chan Hong, Byung-Sam Kim, Jae-Kyung Cheon
이일주, 홍승찬, 김병삼, 천재경
Korean J. Met. Mater. 2020;58(6):433-438.   Published online 2020 May 19
DOI: https://doi.org/10.3365/KJMM.2020.58.6.433

Technologies for pedestrian safety are increasingly emphasized by Automakers in advance of autonomous driving vehicles. A Night Vision System attached behind the front grille can reduce fatal accidents, especially during the nighttime, however, consumers may hesitate to adopt such systems on account of their high price. High-cost Germanium is used..... More

Interactions Between Ionic Liquid (ALiCY) and TBP and their Use in Hydrometallurgy for Extracting Co(II) and Ni(II)
Thanh Tuan Tran, Man Seung Lee
Korean J. Met. Mater. 2020;58(6):423-432.   Published online 2020 May 14
DOI: https://doi.org/10.3365/KJMM.2020.58.6.423

Ionic liquids have emerged in hydrometallurgy as potential extractants for metals. In this work, the interactions of ALiCY (R4N+A-) synthesized by Aliquat336 and Cyanex272, and a mixture of ALiCY and TBP, were analyzed using extraction data and FT-IR spectroscopy. Co(II) and Ni(II) were extracted from two HCl concentrations (1.0×10-4 and..... More

Effect of Cladding Conditions on Solidification Cracking Behavior during Dissimilar Cladding of Inconel Alloy FM 52 and 308L Stainless Steel to Carbon Steel: Evaluation of Solidification Brittle Temperature Range by TransverseVarestraint Test
인코넬 FM52 및 308L 스테인리스강을 이용한 탄소강 이종 클래딩 및 공정변수에 따른 응고균열 발생 거동 변화: Transverse-Varestraint 시험을 이용한 응고취성 온도범위 평가
Yookyung Kim, Byungrok Moon, Namhyun Kang, Eun-Joon Chun
김유경, 문병록, 강남현, 천은준
Korean J. Met. Mater. 2020;58(6):403-412.   Published online 2020 May 14
DOI: https://doi.org/10.3365/KJMM.2020.58.6.403

In this study, solidification cracking behavior and susceptibility in dissimilar cladding of Inconel alloy FM 52, 308L stainless steel to carbon steel, was investigated by submerged arc welding and transverse−Varestraint testing with gas tungsten arc welding. The effect of cladding conditions on cracking behavior and susceptibility was extensively evaluated, and..... More

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