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레이저로 적층 제조된 STS316L에 대한 직접에너지적층 응용 보수 시 공정 중 후열처리(In-Situ Post Heating) 효과
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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
Abstract
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.....
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페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
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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
Abstract
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.....
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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
Abstract
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.....
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Cyanex 272와 Aliquat 336으로 제조한 이온성액체로 염산용액에서 추출과 세정에 의한 터븀(III) 및 디스프로슘(III)의 분리
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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
Abstract
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.....
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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
Abstract
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.....
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탄탈륨 라이너의 폭발성형관통자 형성 시 형상 및 조직 변화 연구
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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
Abstract
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.....
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열처리 및 HIP 공정을 이용한 가스터빈 고온부품 재생시 미세조직 및 기계적 특성 변화
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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
Abstract
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.....
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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
Abstract
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.....
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CuO 버퍼층 증착 횟수에 따른 CuO 광전극의 광전기화학적 특성 연구
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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
Abstract
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.....
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극초임계압 화력발전소용 마르텐사이트계 10Cr 내열강 열영향부의 용접후열처리 균열 감수성
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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
Abstract
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.....
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9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
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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
Abstract
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 M
23
C
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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.....
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자동차 도어보강재의 경량화 및 충돌특성 향상을 위한 형상 최적화 연구
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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.....
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Al, V, Cr, Mn, Ni, Nb, Mo 및 W 첨가에 따른 바이오매스 보일러용 BCC-Fe의 탄성 특성과 경도 변화의 이론적 고찰
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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.....
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Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
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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.....
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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,.....
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AlN 기계적 성질에 미치는 BN 첨가 영향
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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.....
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소결온도 변화에 따른 Binderless-WC 소결체 특성평가
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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.....
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Selective laser melting 공정으로 제조된 AISI 316L 합금의 상온 및 고온 압축 변형 거동
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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.....
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변형률 속도에 따른 AZ31 Mg 합금의 집합조직 및 전위 거동 관찰
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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.....
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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.....
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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.....
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합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
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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,.....
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화상인식을 이용한 Al-Si 주조용 합금의 화학조성 예측
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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.....
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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.....
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AISI 1045 강의 인장 및 고주기 피로 특성에 미치는 Cr 도금층 두께의 영향
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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.....
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나노스케일 질화규소 멤브레인의 기계적, 열적 특성 분석
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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.....
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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,.....
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크롬과 니켈 첨가가
α
-Fe 표면의 염소 가스 부식 특성에 미치는 영향
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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).....
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스퍼터링법으로 증착된 ZnO/Ag/ZnO 투명전극의 성능 최적화 연구
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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.....
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