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유한요소해석을 활용한 다공 금속의 구조-물성 관계 연구
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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
Abstract
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.....
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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
Abstract
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 SnO
2
nanowires and coated them with a 5 nm-thick or 10.....
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초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
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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
Abstract
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.....
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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
Abstract
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.....
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고주파 유도 가열에 의한 나노구조의 Nb-Al
2
O
3
복합재료 제조와 기계적 성질
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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
Abstract
Al
2
O
3
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. Al
2
O
3
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.....
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Zn/Zn-Mg 이중 층 박막의 밀착력 향상을 위한 Zn interlayer 미세구조 제어에 관한 연구
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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
Abstract
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.....
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실리콘 웨이퍼의 그리비지 다이싱 역학
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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
Abstract
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.....
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Bi-Sb-Te계 합금의 열전물성에 대한 Cu 및 In 첨가 영향
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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
Abstract
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 Bi
0.4
Sb
1.6
Te
3
alloy, different groups of samples were prepared and characterized, including undoped Bi
0.4
Sb
1.6
Te
3
, In single-doped samples and In.....
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리튬함유 폐액으로부터 전기투석에 의한 리튬의 분리·농축 연구
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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
Abstract
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.....
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3가 크롬 도금욕에서 펄스 도금의 전기화학적 변수 최적화를 통한 크롬 도금막의 내식성 향상 연구
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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
Abstract
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.....
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Fe-18Mn강의 응력부식균열 거동에 미치는 크롬과 질소의 영향
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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
Abstract
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.....
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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
Abstract
We employed spark plasma sintering (SPS) in the presence of sintering aids to fabricate high-quality Ho
3+
,Yb
3+
-co-doped Y
2
O
3
transparent ceramics suitable for use as a laser gain medium, and analyzed their microstructure and optical properties. Ho
3+
,Yb
3+
-co-doped Y
2
O
3
transparent ceramics with different contents of Yb
3+
were fabricated by SPS and exhibited high.....
More
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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
Abstract
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.....
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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
Abstract
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,.....
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Ti-44.5Ni-5Cu 및 Ti-45.2Ni-5Cu(at%) 합금의 형상기억특성에 미치는 어닐링온도의 영향
J
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I
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K
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K
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a
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S
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H
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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
Abstract
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.....
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A
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Mg-Zn합금의 압출 공정 중 동적 석출 거동에 대한 고찰
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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
Abstract
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.....
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레이저로 적층 제조된 STS316L에 대한 직접에너지적층 응용 보수 시 공정 중 후열처리(In-Situ Post Heating) 효과
W
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k
J
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n
O
h
,
Y
o
n
g
S
o
n
,
D
o
S
i
k
S
h
i
m
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
J
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-
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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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p
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(
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(
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3
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6
Cyanex 272와 Aliquat 336으로 제조한 이온성액체로 염산용액에서 추출과 세정에 의한 터븀(III) 및 디스프로슘(III)의 분리
C
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,
S
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H
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L
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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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6
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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
S
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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
S
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C
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-
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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
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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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