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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

Abstract
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
정우창
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

Abstract
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

Abstract
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

                        
Effect of Ni and Cu Addition on Corrosion Behaviors of Pre-Oxidized Ultra-Strong Steel for Automotive Applications
Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
Seung Min Ryu, Hwan Goo Seong, Jeong Kil Kim, Joong-Ki Hwang, Man Jae Lee, Min-Suk Oh, Sung Jin Kim
류승민, 성환구, 김정길, 황중기, 이만재, 오민석, 김성진
Korean J. Met. Mater. 2019;57(6):343-351.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.343

Abstract
The incomplete elimination of oxide scale formed during the normalizing process can result in severe degradation of the surface and mechanical properties of ultra-strong steels. This study revealed that the formation of oxide scale was highly dependent upon the alloying elements Ni and Cu. Ni-bearing steel showed a much higher..... More

                        
Electronic Transport and Thermoelectric Properties of Cu<sub>12-x</sub>Zn<sub>x</sub>Sb<sub>4</sub>S<sub>13</sub> Tetrahedrites Prepared by Mechanical Alloying and Hot Pressing
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2019;57(5):328-333.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.328

Abstract
Tetrahedrite Cu12Sb4S13 has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. When the Cu atoms of Cu12Sb4S13 are partially substituted with a transition metal, changes in the Cu vibrations can intensify phonon scattering,..... More

                        
Effect of BN Addition on the Mechanical Properties of AlN
AlN 기계적 성질에 미치는 BN 첨가 영향
Woo-Jin Cho, Se-Hoon Oh, In-Jin Shon
조우진, 오세훈, 손인진
Korean J. Met. Mater. 2019;57(5):310-315.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.310

Abstract
Aluminum nitride (AlN) has several attractive properties including high thermal conductivity, excellent electrical insulation, a thermal expansion coefficient close to that of Si and low density. Accordingly, it is considered a promising packing material and substrate for high power integrated circuits. However, its low fracture toughness at room temperature limits..... More

                        
Property Evaluation of Binderless-WC Hard Materials as a Function of Sintering Temperature
소결온도 변화에 따른 Binderless-WC 소결체 특성평가
Hyun-Kuk Park, Jeong-Han Lee, Jun-Ho Jang, Ik-Hyun Oh
박현국, 이정한, 장준호, 오익현
Korean J. Met. Mater. 2019;57(5):304-309.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.304

Abstract
In this study, Binderless-WC hard materials were fabricated using the pulsed current activated sintering (PCAS) process for a Friction Stir Welding tool and difficult-to-cut tool application. Tungsten carbide (WC) hard materials are used in various industries and possess a superior hardness compared to other hard materials. They have particularly high..... More

                        
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 Lee
함기수, 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

                        
Investigation of the Texture and Dislocation Behavior of AZ31 Magnesium Alloy Under Different Strain Rate Conditions
변형률 속도에 따른 AZ31 Mg 합금의 집합조직 및 전위 거동 관찰
Dong-Gi Lee, Jun-Beom Kwon, Hyun-Jong Lee, Su-Mi Jo, oung-Mok Rhyim, Won-Jon Yang, Yang-do Kim
이동기, 권준범, 이현종, 조수미, 임영목, 양원존, 김양도
Korean J. Met. Mater. 2019;57(5):279-288.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.279

Abstract
This study is concerned with the influence of strain rate on the plastic deformation behavior and microstructure variables of AZ31 magnesium alloy sheet. The tensile properties were measured at room temperature at a strain rate of 0.001 and 100 s–1 using a universal tensile testing machine and servo-hydraulic high-speed tensile..... More

                        
Thermoelectric Properties of MnSi1.74-1.75:Ge<i>m</i> Prepared by Solid-State Reaction and Hot Pressing
In-Jae Lee, Sol-Bin Park, Soon-Chul Ur, Kyung-Wook Jang, Il-Ho Kim
Korean J. Met. Mater. 2019;57(4):264-269.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.264

Abstract
Higher manganese silicides (HMSs) MnSi1.74-1.75:Gem (m = 0.01–0.04) were prepared by solid-state reaction and hot pressing. The major phases of the HMSs were Mn27Si47 or Mn4Si7, and a small quantity of Si remained, but the intermetallic compound MnSi was not formed. The lattice constant increased with the substitution of Ge..... More

                        
Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2019;57(4):236-244.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.236

Abstract
ASTM P91 steel (viz. 9Cr-1Mo steel) was hot-dip aluminized to form a ~70 μm thick coating, and was then corroded in N2/0.1%H2S gas for 50 h at 800 and 900 ºC, to study the effect of aluminizing on the corrosion resistance of P91 steel in highly corrosive H2S environments. Before..... More

                        
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 Choi
황연정, 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

                        
Estimation of Chemical Composition of Al-Si Cast Alloys Using Image Recognition
화상인식을 이용한 Al-Si 주조용 합금의 화학조성 예측
Sang-Jun Jeong, In-Kyu Hwang, In-Sung Cho, Hee-Soo Kim
정상준, 황인규, 조인성, 김희수
Korean J. Met. Mater. 2019;57(3):184-192.   Published online 2019 Feb 14
DOI: https://doi.org/10.3365/KJMM.2019.57.3.184

Abstract
In this study, we analyzed the chemical composition of Al-Si cast alloys from microstructural images, using image recognition and machine learning. Binary Al-Si alloys of Si = 1~10 wt% were cast and prepared as reference images in the dataset used for machine learning. The machine learning procedure was constructed with..... More

                        
Effects of Zn(BH<sub>4</sub>)<sub>2</sub>, Ni, and/or Ti Doping on the Hydrogen-Storage Features of MgH<sub>2</sub>
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2019;57(3):176-183.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.176

Abstract
In the present work, MgH2 was doped with Zn(BH4)2, Ni, and/or Ti to improve its hydrogen absorption and release features. Samples were prepared by grinding in a planetary ball mill in a hydrogen atmosphere. To increase the hydrogen absorption and release rates without significantly sacrificing hydrogenstorage capacity the additive percentages..... More

                        
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 Lee
함기수, 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

                        
Investigation of the Mechanical/Thermal Properties of Nano-Scale Silicon Nitride Membranes
나노스케일 질화규소 멤브레인의 기계적, 열적 특성 분석
Yong Ju Jang, Hyeon-Jin Shin, Seong Ju Wi, Ha Neul Kim, Gi Sung Lee, Jinho Ahn
장용주, 신현진, 위성주, 김하늘, 이기성, 안진호
Korean J. Met. Mater. 2019;57(2):124-129.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.124

Abstract
In micro/nano electro-mechanical system, silicon nitride (SiNx) membrane has been widely used in sensors, energy harvesting and optical filters because of its mechanical/chemical stability. However, it is necessary to verify mechanical and thermal properties of nanoscale SiNx membranes to ensure the desirable reliability and durability of a device because the..... More

                        
Pressure Transmission in the Compaction Process of Nickel Powder Using the Finite Element Methods
Jong Won Baek, Seong Jin Park
Korean J. Met. Mater. 2019;57(2):115-123.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.115

Abstract
The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process,..... More

                        
Effects of Added Cr and Ni on the Resistance of -Iron Surface to Cl<sub>2</sub> Gas Corrosion
크롬과 니켈 첨가가 α-Fe 표면의 염소 가스 부식 특성에 미치는 영향
Jiwoong Kim, MyungJae Kim, Chang Yul Seo, Jungho Ryu, Taegong Ryu, Hye-Jin Hong, Yong Jae Suh
김지웅, 김명재, 서창열, 류정호, 류태공, 홍혜진, 서용재
Korean J. Met. Mater. 2019;57(2):108-114.   Published online 2019 Feb 5
DOI: https://doi.org/10.3365/KJMM.2019.57.2.108

Abstract
As energy generation by recycling biomass has become increasingly attractive, research on biomass recycling has focused on improving operational efficiency. To develop a new material composition for the inner wall of a biomass boiler, we investigated the effect of Cr and Ni addition on the resistance of the α-iron (100)..... More

                        
Optimization of ZnO/Ag/ZnO Transparent Conductive Electrodes Fabricated by Magnetron Sputtering
스퍼터링법으로 증착된 ZnO/Ag/ZnO 투명전극의 성능 최적화 연구
Woo Hyeon Jo, Dooho Choi
조우현, 최두호
Korean J. Met. Mater. 2019;57(2):91-96.   Published online 2019 Jan 11
DOI: https://doi.org/10.3365/KJMM.2019.57.2.91

Abstract
The critical role of the thicknesses of the top and bottom oxide layers, as well as Ag layer, in ZnO/Ag/ZnO transparent conductive electrodes were investigated. The Ag forms a nearly continuous layer at the thickness of 8 nm, at which the Ag sheet resistance of 8.0 Ω/Sq. is lower than..... More

                           Cited By 1
Influence of the Thickness of TiO<sub>2</sub>/TiO<sub>2-x</sub> Layers on the Behavior of a Memristor Device
TiO2/TiO2-x 박막층의 두께가 멤리스터 소자의 특성에 미치는 영향
Han-Sang Kim, Sung-Jin Kim
김한상, 김성진
Korean J. Met. Mater. 2019;57(2):84-90.   Published online 2019 Feb 5
DOI: https://doi.org/10.3365/KJMM.2019.57.2.84

Abstract
Memristors have been extensively investigated as the fourth fundamental circuit element. Titanium oxide is a common material used to fabricate memristors. In this paper, we investigated the influence of the thickness of the oxide active layer on the Al/TiO2-x/TiO2/heavily doped electrode memristor architecture. An insulating TiO2 thin-film was deposited using..... More

                           Cited By 1
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 Kim
이재원, 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

                        
Effect of Stress Magnitude on the Tensile Properties of Damaged Damping Alloy Under Fatigue Stress
피로손상된 제진합금의 인장성질에 미치는 피로응력 크기의 영향
Myong-Soo Lee, Kwon-Hoo Kim, Chang-Yong Kang
이명수, 김권후, 강창룡
Korean J. Met. Mater. 2019;57(2):71-76.   Published online 2019 Jan 8
DOI: https://doi.org/10.3365/KJMM.2019.57.2.71

Abstract
This study was carried out to investigate the effect of fatigue stress magnitude on the tensile properties of the damaged Fe – 22Mn – 12Cr – 3Ni – 2Si – 4Co damping alloy under various fatigue stress magnitudes. α´ and ε-martensite were formed by fatigue stress in the Fe –..... More

                        
Direct Measurement of Electric Resistivity of Solid Electrolyte Interface Using 4-Point-Probe Technique
4점 탐침 측정법을 이용한 고상전해질계면의 비저항 측정
Jun-Hyoung Park, Yong-Seok Choi, Hyung Cheoul Shim, Jae-Pyoung Ahn, Jae-Chul Lee
박준형, 최용석, 심형철, 안재평, 이재철
Korean J. Met. Mater. 2019;57(1):67-70.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.67

Abstract
Lack of understanding on the electrical properties of the solid electrolyte interface (SEI) has been one of the major hurdles for developing fast charging Li-ion batteries. Here, we report our preliminary experimental result on the measurement of the electrical resistivity of SEI using the direct-contact technique based on electron microscopy..... More

                        
Mechanical Properties of Liquid Phase Sintered SiC Materials by the Addition of Unimodal and Bimodal Particles
단일 크기와 이중 크기의 탄화규소 입자를 이용한 액상소결 탄화규소의 기계적 특성
Jun Yeab Lee, Sang Pill Lee, Jin Kyung Lee, Moon Hee Lee, Seung Kuk Hwang
이준엽, 이상필, 이진경, 이문희, 황승국
Korean J. Met. Mater. 2019;57(1):60-66.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.60

Abstract
Both the mechanical properties and probability distribution of liquid phase sintered SiC (LPS-SiC) materials were investigated, based on a detailed analysis of their microstructures. In particular, the effect of the starting sizes of SiC particles on the characterization of LPS-SiC materials was evaluated. LPS-SiC materials were fabricated with a constant..... More

                        
Comparison of Microstructure and Residual Stress Affecting Stress Corrosion Cracking Susceptibility of Austenitic Stainless Steel Tubes
오스테나이트 스테인리스강 튜브의 응력부식균열 민감도에 영향을 미치는 미세조직 및 잔류응력 비교
Ho Jung Lee, Seungjin Oh, Hongdeok Kim
이호중, 오승진, 김홍덕
Korean J. Met. Mater. 2019;57(1):51-59.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.51

Abstract
Three 304L austenitic stainless steel feedwater heater (FWH) tubes used in pressurized water reactors (PWRs) were investigated in this study. By comparing metallurgical differences, such as microstructural features, micro-hardness, and circumferential residual stress of the failed and non-failed FWH tubes by stress corrosion cracking (SCC), factors which could affect SCC..... More

                           Cited By 1
Analysis of a Slab and Slab Heater Cover in a Compact Endless Cast and Rolling Mill Process Using Finite Element Methods
Jong Won Baek, Joo Won Oh, Jae-Sook Chung, Yong-Seok Cho, Seong Jin Park
백종원, 오주원, 정제숙, 조용석, 박성진
Korean J. Met. Mater. 2019;57(1):43-50.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.43

Abstract
Compact Endless cast and rolling Mill (CEM) processes were developed and used to fabricate steel products such as steel slabs. However, the coiling furnace in this process was very expensive, so a new layout was suggested. As the coiling furnace was removed, the interval among the slab heaters had to..... More

                        
Domain Wall Motions in a Near-Morphotropic Pb(Zr,Ti)O3 Under Mechanical Stress Observed by In Situ Piezoresponse Force Microscopy
Kwanlae Kim
김관래
Korean J. Met. Mater. 2019;57(1):38-42.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.38

Abstract
Many important material properties of ferroelectric ceramics such as piezoelectric coefficient and hysteresis curve are governed by domain structures and their evolution processes. In the present work, domain wall motions in a near-morphotropic Pb(Zr,Ti)O3 under an external compressive stress were observed using in situ piezoresponse force microscopy (PFM). This specific..... More

                        
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 Kang
박수길, 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

                        
Comparison Between Multi-Axial Forging and Multi-Axial Diagonal Forging of AA1100 Using Finite Element Analysis
유한요소해석을 이용한 AA1100의 다축 단조와 다축대각 단조의 비교
Hyo-Tae Jeong, MinSeong Kim, SangChul Kwon, SunTae Kim, Seong Lee, Shi-Hoon Choi
정효태, 김민성, 권상철, 김순태, 이성, 최시훈
Korean J. Met. Mater. 2019;57(1):18-27.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.18

Abstract
The effect that forging routes (3 routes, A-C) exert on the development of deformation heterogeneity in AA1100 was theoretically performed using finite element analysis. Route A corresponded to a forging process that involved from 1 to 6 passes through multi-axial diagonal forging (MADF); Route B corresponded to a forging process..... More

                        
Recent Progress in First Principle Calculation and High-Throughput Screening of Electrocatalysts: A Review
전기화학촉매의 제일원리 계산 및 하이스루풋 스크리닝 연구 동향: 리뷰
Changsoo Lee, Kihoon Bang, Doosun Hong, Hyuck Mo Lee
이창수, 방기훈, 홍두선, 이혁모
Korean J. Met. Mater. 2019;57(1):1-9.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.1

Abstract
There are many ongoing efforts to develop sustainable, clean, efficient, and economical pathways to produce renewable energy sources to satisfy worldwide energy demands. Electrochemical conversion processes, such as water splitting, CO2 conversion and N2 electroreduction, have been considered as successful approaches to solve these energy issues. Over the past decade,..... More

                        
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