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Investigation of Structure-Property Relations in Porous Metals Using Finite Element Simulation
유한요소해석을 활용한 다공 금속의 구조-물성 관계 연구
Dongmyung Jung, Yongwoo Kwon
정동명, 권용우
Korean J. Met. Mater. 2019;57(11):747-754.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.747

A porous material can be regarded as a mixture of pores and solid phases, with effective thermal and mechanical properties that significantly differ from those of its base material. Material effective properties depend greatly on the structure and porosity. The effective properties of materials with different pore structures can vary..... More

Low-Temperature H<sub>2</sub>S Sensors Based on Si-Coated SnO<sub>2</sub> Nanowires
Myung Sik Choi, Ali Mirzaei, Jae Hoon Bang, Han Gil Na, Changhyun Jin, Wansik Oum, Seungmin Han, Sang Sub Kim, Hyoun Woo Kim
Korean J. Met. Mater. 2019;57(11):732-740.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.732

To attain high life standards, it is important to develop high-performance non-toxic gas sensors for public safety, environmental pollutant control, industrial processes, etc. Because reports on single element semiconductor-coated semiconducting metal oxides for sensing applications are rare, we synthesized SnO2 nanowires and coated them with a 5 nm-thick or 10..... More

Study on the Effect of the Localized Electrode Degradation on Weldability During an Electrode Life Test in Resistance Spot Welding of Ultra-High Strength Steel
초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
Jae-Won Kim, Siva Prasad Murugan, Nam Hyun Kang, Yeong-Do Park
김재원, Siva Prasad Murugan, 강남현, 박영도
Korean J. Met. Mater. 2019;57(11):715-725.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.715

Evaluation of electrode degradation in resistance spot welding of 1180TRIP steel was carried out through an electrode life test, and weldability testing was performed by the measurement of the nugget size, the peak load analysis and the measurement of the electrode tip size at 30 intervals. Analysis of the change..... More

Mechanical Performance and Microstructure of Resistance Element Welds of Dissimilar Metals Created with a Headless Rivet
Young Hyun Oh, Hyun Jung Ryu, Taejung Kim, Minsu Choi, Taeseon Lee
Korean J. Met. Mater. 2019;57(11):708-714.   Published online 2019 Oct 8
DOI: https://doi.org/10.3365/KJMM.2019.57.11.708

Resistance Element Welding (REW) is a novel processing technology developed to join dissimilar materials such as aluminum and steel. It uses an auxiliary steel rivet (element) inserted into an aluminum sheet that forms a resistance spot weld with the steel sheet, and the aluminum work piece is mechanically joined by..... More

Mechanical Properties and Fabrication of a Nanostructured Nb-Al<sub>2</sub>O<sub>3</sub> Composite by High Frequency Induction Heating
고주파 유도 가열에 의한 나노구조의 Nb-Al2O3 복합재료 제조와 기계적 성질
Seong-Eun Kim, Se-Hoon Oh, In-Jin Shon
김성은, 오세훈, 손인진
Korean J. Met. Mater. 2019;57(11):701-707.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.701

Al2O3 has a high Young’s modulus (380 GPa), a low density (3.98 g· cm-3), good high-temperature mechanical properties, biocompatibility and excellent oxidation resistance. Al2O3 has been used for automotive, aerospace, bio-materials and various industrial applications. Despite its various merits, the low fracture toughness of the material below the brittle-ductile transition..... More

Studies on the Microstructure-Controlled Zn Interlayer for Improving the Adhesion Strength of the Zn/Zn-Mg Double Layer Coating
Zn/Zn-Mg 이중 층 박막의 밀착력 향상을 위한 Zn interlayer 미세구조 제어에 관한 연구
Seung-Hwan Lee, Hoe-Kun Kim, Myeon-Kyu Song, Jung-Wan Kim, Sang-Yul Lee
이승환, 김회근, 송면규, 김정완, 이상율
Korean J. Met. Mater. 2019;57(11):695-700.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.695

In this study, the microstructure-controlled Zn interlayers were synthesized to improve the adhesion strength of Zn/Zn-Mg double layer coatings. The coating chamber temperature and working pressure were controlled based on the Structure Zone Model principles, to obtain a dense columnar microstructure in the Zn interlayer. By controlling the coating chamber..... More

Cleavage Dicing Mechanics in Silicon Wafers
실리콘 웨이퍼의 그리비지 다이싱 역학
Seong-Min Lee, Yeon-Wook Kim
이성민, 김연욱
Korean J. Met. Mater. 2019;57(11):689-694.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.689

This article details how effectively dicing damage of silicon wafers can be mechanically minimized by appropriate laser-induced groove formation prior to wafer separation. Various laser dicing factors, such as the laser-control power, the scan rate and the scan number of the laser beam, were estimated to determine the optimum groove..... More

Effect of Cu/In Doping on the Thermoelectric Transport Properties of Bi-Sb-Te Alloys
Bi-Sb-Te계 합금의 열전물성에 대한 Cu 및 In 첨가 영향
Hyun Jun Cho, Hyun-Sik Kim, Sang-Il Kim
조현준, 김현식, 김상일
Korean J. Met. Mater. 2019;57(10):673-678.   Published online 2019 Sep 23
DOI: https://doi.org/10.3365/KJMM.2019.57.10.673

Herein we report the effect of Cu/In doping on the electronic and thermal transport properties of Bi-Sb-Te thermoelectric alloys. To closely examine the role of each doping element when incorporated in a Bi0.4Sb1.6Te3 alloy, different groups of samples were prepared and characterized, including undoped Bi0.4Sb1.6Te3, In single-doped samples and In..... More

A Study on the Separation and Concentration of Li from Li-Containing Waste Solutions by Electrodialysis
리튬함유 폐액으로부터 전기투석에 의한 리튬의 분리·농축 연구
Jueun Lee, Hongil So, Yeonchul Cho, Inhwan Jang, Jaewoo Ahn, Jaeheon Lee
이주은, 소홍일, 조연철, 장인환, 안재우, 이재헌
Korean J. Met. Mater. 2019;57(10):656-662.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.656

Electrodialysis was used to develop a highly efficient process for concentrating and recovering Li from the Li-containing waste solution that is generated after recovering Co and Ni from a leach solution of waste cathode materials of Li ion batteries. The optimum conditions were investigated by comparing the concentration of Li..... More

Optimization of Electrochemical Variables of Pulse-Reverse Electroplating in Trivalent Chromium Bath to Enhance the Corrosion Resistance of Chromium Film
3가 크롬 도금욕에서 펄스 도금의 전기화학적 변수 최적화를 통한 크롬 도금막의 내식성 향상 연구
Chaewon Lim, Dongwook Lim, Bonil Ku, Sang Eun Shim, Sung-Hyeon Baeck
임채원, 임동욱, 구본일, 심상은, 백성현
Korean J. Met. Mater. 2019;57(10):641-647.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.641

Electroplating chromium films in a trivalent chromium bath has been extensively investigated as a replacement for the conventional hexavalent chromium bath. However, commercialization of the trivalent chromium method has been hindered because the resulting chromium films exhibit inferior mechanical properties compared to hexavalent chromium coated film. In this study, we..... More

Effect of Cr and N on Stress Corrosion Cracking Behavior of Fe-18Mn Steel
Fe-18Mn강의 응력부식균열 거동에 미치는 크롬과 질소의 영향
Heesoo Choi, Sumin Kim, Hyokyung Sung, Sung-Joon Kim, Sangshik Kim
최희수, 김수민, 성효경, 김성준, 김상식
Korean J. Met. Mater. 2019;57(10):624-631.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.624

High-Mn steels developed for offshore industries require good resistance to stress corrosion cracking (SCC) in seawater. Elements like Cr and N are often added to improve the resistance to SCC. In this study, the SCC behavior of Fe18Mn3Cr0.1N and Fe19Mn19Cr0.6N steels in artificial seawater was examined. Slow strain rate tests..... More

Up- and Downconversion Luminescence in Ho<sup>3+</sup>,Yb<sup>3+</sup>-Co-Doped Y<sub>2</sub>O<sub>3</sub> Transparent Ceramics Prepared by Spark Plasma Sintering
Cheol Woo Park, Jun Hyeong In, Jae Hwa Park, Kwang Bo Shim, Jeong Ho Ryu
Korean J. Met. Mater. 2019;57(9):609-616.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.609

We employed spark plasma sintering (SPS) in the presence of sintering aids to fabricate high-quality Ho3+,Yb3+-co-doped Y2O3 transparent ceramics suitable for use as a laser gain medium, and analyzed their microstructure and optical properties. Ho3+,Yb3+-co-doped Y2O3 transparent ceramics with different contents of Yb3+ were fabricated by SPS and exhibited high..... More

Optimization of the CMP Process with Colloidal Silica Performance for Bulk AlN Single Crystal Substrate
Hyo Sang Kang, Joo Hyung Lee, Jae Hwa Park, Hee Ae Lee, Won Il Park, Seung Min Kang, Sung Chul Yi
Korean J. Met. Mater. 2019;57(9):582-588.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.582

Chemical mechanical polishing (CMP) of bulk AlN was performed with colloidal silica slurry at pH 9 for different times. The result shows that colloidal silica slurry at pH 9, which has the relatively high surface charge of -50.7 mV is most stable, and it was selected as chemically optimum condition..... More

High-Temperature Oxidation of Fe-12Cr-0.3C-4Mn-(13-15)Cu Composite Alloys
Min Jung Kim, Sang-Hwan Bak, Junhee Hahn, Seon Jin Kim, Dong Bok Lee
Korean J. Met. Mater. 2019;57(9):575-581.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.575

Alloys of Fe-12Cr-0.3C-4Mn-(13, 14, 15)Cu (wt%) were cast using an induction furnace. They were structurally heterogeneous composites that consisted of a relatively stiff α-Fe matrix and a soft (Cu, Mn)-rich secondary phase. They were developed as self-lubricating, wear-resistant metals. Since the formation of oxides plays an important role in wear,..... More

Effect of Annealing Temperature on the Shape Memory Properties of Ti-44.5Ni-5Cu and Ti-45.2Ni-5Cu(at%) Alloys
Ti-44.5Ni-5Cu 및 Ti-45.2Ni-5Cu(at%) 합금의 형상기억특성에 미치는 어닐링온도의 영향
Jae Il Kim, Kwang Sun Hwang
김재일, 황광선
Korean J. Met. Mater. 2019;57(9):562-568.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.562

The effect of annealing temperature on shape memory properties in the Ti-44.5Ni-5Cu and Ti-45.2Ni-5Cu(at%) alloys was investigated by differential scanning calorimeter (DSC) and tensile testing. The martensitic transformation temperature of Ti-44.5Ni-5Cu(at%) increased from 308K to 324K with increasing annealing temperature and did not change with further increasing annealing temperature. This..... More

Evaluation of Dynamic Precipitation in Extruded Mg-Zn Alloy
Mg-Zn합금의 압출 공정 중 동적 석출 거동에 대한 고찰
Guang Zhe Li, Min Young Na, Hye Jung Chang, Pil Ryung Cha, Yu Chan Kim, Hyun Kwang Seok
이광철, 나민영, 장혜정, 차필령, 김유찬, 석현광
Korean J. Met. Mater. 2019;57(9):555-561.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.555

The dynamic precipitation evolution of Mg-3 wt% Zn alloy during extrusion was evaluated in this study. Precipitation evolution during aging has been well investigated for the Mg-Zn alloy, which is known as static precipitation. However, little attention has been given to dynamic precipitation in Mg-Zn alloy. In order to evaluate..... More

Effect of In-Situ Post Heating on Repairing STS316L Built by Laser Powder Bed Fusion Using Direct Energy Deposition
레이저로 적층 제조된 STS316L에 대한 직접에너지적층 응용 보수 시 공정 중 후열처리(In-Situ Post Heating) 효과
Wook Jin Oh, Yong Son, Do Sik Shim
오욱진, 손용, 심도식
Korean J. Met. Mater. 2019;57(8):543-553.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.543

The repairing parts were fabricated by PBF (powder bed fusion) using direct energy deposition (DED), interfacial cracks can occur at the interface between the substrate and the area to be repaired. Such interfacial defects are due to the thermal stress induced by the temperature gradient which results from repeated melting..... More

Computational Design of Highly Efficient and Robust Hole Transport Layers in Perovskite Solar Cells
페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
Jiyoung Jeong, Dongjun Song, Jihye Choe, Choong-Heui Chung, Ki-Ha Hong
정지영, 송동준, 최지혜, 정중희, 홍기하
Korean J. Met. Mater. 2019;57(8):535-542.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.535

We investigated the effects of materials and the film thickness of hole transport layers (HTLs) on inverted type perovskite solar cells using optics-charge transport coupled simulations. Power conversion efficiencies (PCEs), and the variations in efficiency induced by the film thickness dispersion, were intensively studied, to compare potential HTLs candidates like..... More

Thermal Conductivity of Three-Dimensionally Interconnected Graphene-Networked Cu Composite Fabricated by a Simple Two-Step Process
Xue Li, Terry Arthur Ring, Byung-Sang Choi
Korean J. Met. Mater. 2019;57(8):529-534.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.529

A Cu composite reinforced by a three-dimensionally interconnected graphene network was synthesized in situ by a simple two-step process utilizing compacted Cu powder (99% purity) as a template for the growth of graphene. Cu composites with different graphene contents were obtained by controlling the processing parameters. The composites were approximated..... More

Separation of Tb(III) and Dy(III) from Chloride Solution by Extraction and Scrubbing with Ionic Liquid Prepared with Cyanex 272 and Aliquat 336
Cyanex 272와 Aliquat 336으로 제조한 이온성액체로 염산용액에서 추출과 세정에 의한 터븀(III) 및 디스프로슘(III)의 분리
Chang Geun Oh, Seong Ho Son, Man Seung Lee
오창근, 손성호, 이만승
Korean J. Met. Mater. 2019;57(8):499-505.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.499

Terbium and dysprosium are rare earth elements which are employed in the manufacture of advanced materials. Separating Tb(III) and Dy(III) is very complicated because their chemical properties are similar. In order to develop a separation process based on solvent extraction, extraction and scrubbing experiments were conducted using weak hydrochloric solutions..... More

Hydrogen-Induced Cracking of Laser Beam and Gas Metal Arc Welds on API X65 Steel
Junghoon Lee, Myeonghyun Kim, Yeongdo Park, Cheolho Park, Cheolhee Kim, Namhyun Kang
Korean J. Met. Mater. 2019;57(8):491-498.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.491

Hydrogen-induced cracking (HIC) behavior was analyzed for gas metal arc (GMA) and laser beam (LB) welds on American Petroleum Institute (API) X65 steel. The GMA welds consisted of acicular ferrite (AF) with some widmanstatten ferrite (WF), while the LB welds had bainitic ferrite (BF) with some AF. The welds and..... More

Study of Shape and Microstructure Changes of Ta Linear for Building an Explosively Formed Penetrator
탄탈륨 라이너의 폭발성형관통자 형성 시 형상 및 조직 변화 연구
Sung Taek Park, Ju Yeong Kim, Gwang Lyeon Kim, Hyun-Su Kang, Kyeong Won Oh, Hyung-Ki Park, Yi Hwa Song
박성택, 김주영, 김광련, 강현수, 오경원, 박형기, 송이화
Korean J. Met. Mater. 2019;57(8):475-481.   Published online 2019 Aug 5
DOI: https://doi.org/10.3365/KJMM.2019.57.8.475

An explosively formed penetrator (EFP) is a kind of kinetic energy warhead that contains a metal linear structure. After exploding, the linear structure in the EFP is deformed and hits the target as a form of aero-stable long-rod penetrator. To achieve high penetration performance, Ta is commonly used as the..... More

Evolution of Microstructure and Mechanical Characteristics in Rejuvenation of a Hot Gas Pass Component of a Gas Turbine by Heat Treatment and HIP
열처리 및 HIP 공정을 이용한 가스터빈 고온부품 재생시 미세조직 및 기계적 특성 변화
Sung Yong Chang, Ki-Yong Oh
장성용, 오기용
Korean J. Met. Mater. 2019;57(7):468-474.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.468

The evolution of microstructure and mechanical characteristics during the rejuvenation of a hot gas pass component of a gas turbine was investigated with an actual service-exposed bucket in a power plant. Heat treatment and hot isostatic pressing processes were conducted to rejuvenate a hot gas pass component of a F..... More

Effect of Process Parameters on the Angular Distribution of Sputtered Cu Flux in Long-Throw Sputtering System
Hee-Young Shin, Tae-Ho Kim, Jun-Woo Park, Hyun-Chul Sohn
Korean J. Met. Mater. 2019;57(7):462-467.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.462

In this work, the angular distribution of the sputtered Cu flux in a long throw sputtering (LTS) system is extracted from the comparison of experimentally-measured profiles of deposited films with simulated profiles of films in overhang contact structure. And effects of the sputtering process parameters such as Ar pressure during..... More

Photoelectrochemical Properties of Copper Oxide Photoelectrode with Various Copper Oxide Buffer Layers
CuO 버퍼층 증착 횟수에 따른 CuO 광전극의 광전기화학적 특성 연구
Seung-Hwan Jeon, Yaejin Hong, Hyukhyun Ryu, Won-Jae Lee
전승환, 홍예진, 류혁현, 이원재
Korean J. Met. Mater. 2019;57(7):447-455.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.447

In this study, a CuO buffer layer was deposited on a fluorine-doped tin oxide (FTO) substrate using a spin coating method, and then a CuO photoelectrode was grown on the CuO buffer layer using a modified-chemical bath deposition (M-CBD) method. We investigated the morphological, structural, optical, electrical and photoelectrochemical properties..... More

PWHT Cracking Susceptibility in the HAZ of Martensitic 10Cr Steel for A-USC Power Plant
극초임계압 화력발전소용 마르텐사이트계 10Cr 내열강 열영향부의 용접후열처리 균열 감수성
Minjeong Kim, Yongjoon Kang, Namkyu Kim, Sanghoon Lee, Sangwoo Song, Namhyun Kang
김민정, 강용준, 김남규, 이상훈, 송상우, 강남현
Korean J. Met. Mater. 2019;57(7):430-437.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.430

In this study, the post-weld heat treatment (PWHT) cracking susceptibility in the heat affected zone (HAZ) of martensitic 10Cr steel was evaluated. The specimens taken from the 10Cr steel were thermally cycled using a Gleeble to simulate HAZ 1 (δ-ferrite) and HAZ 2 (single phase, γ). HAZ 2 had martensite..... More

Effect of Carbides Formed in 9Cr-1Mo-V-Nb Weld Metals on Elevated Temperature Tensile Strength
9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
Byungrok Moon, Junghoon Lee, Namhyun Kang, Taeho Lee, Woosang Jung, Chulgyu Park, Kyungmox Cho
문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater. 2019;57(7):422-429.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.422

Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M23C6. Nitrogen was reduced from 0.04 to..... More

Tin Microcrystals Synthesized by Thermal Chemical Vapor Deposition in a Hydrogen-Reducing Atmosphere
Daseul Ham, Won Jeong, Hyon Chol Kang
Korean J. Met. Mater. 2019;57(6):390-395.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.390

We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment..... More

Study on Shape Optimization of Automotive Door Impact Beam for Light Weight Design and Improved Crash Performance
자동차 도어보강재의 경량화 및 충돌특성 향상을 위한 형상 최적화 연구
Woochang Jeong
Korean J. Met. Mater. 2019;57(6):381-389.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.381

A study on shape optimization of a hot-stamped automotive door impact beam for lightweight design and improved crash performance was conducted using a static collision analysis based on FMVSS 214. An integral type one-piece door impact beam of bracket parts and pipe was realized using hot stamping technology. The method..... More

Effects of Al, V, Cr, Mn, Ni, Nb, Mo, and W Addition to BCC-Fe on its Elastic Properties and Hardness for a Biomass Boiler: First Principles Approaches
Al, V, Cr, Mn, Ni, Nb, Mo 및 W 첨가에 따른 바이오매스 보일러용 BCC-Fe의 탄성 특성과 경도 변화의 이론적 고찰
Jiwoong Kim, MyungJae Kim, Chang Yul Seo, Jungho Ryu, Taegong Ryu, Hye-Jin Hong, Doyeon Shin, Yong Jae Suh
김지웅, 김명재, 서창열, 류정호, 류태공, 홍혜진, 신도연, 서용재
Korean J. Met. Mater. 2019;57(6):374-380.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.374

During biomass combustion for renewable energy generation, combustion byproducts such as fly ash and metal chlorides cause serious erosion problems in boilers, as well as corrosion. To develop a highly wear-resistant composition of alloy for biomass boilers, we investigated how the addition of various metallic elements to BCC-Fe affected its..... More

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