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Korean J. Met. Mater.
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다성분계 Al-Si-Cu-Ni 합금의 미세조직적 인자와 고온강도의 상관관계에 대한 연구
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조민수, 조영희, 이정무, 김수배, 김수현, 장재일
Korean J. Met. Mater.
2022;60(7):489-501. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.489
Abstract
The elevated temperature strength of multicomponent Al-Si alloys is greatly affected by the volume fraction and the interconnectivity of hard phases formed upon solidification. In the present investigation, such influences were examined for two Al-Si-Cu-Ni alloys with different total volume fractions of hard phases. To control the microstructural features related.....
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Korean J. Met. Mater.
2022;60(6):471-477. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.471
Abstract
Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,.....
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Al 5052-H32 합금의 저항 점 용접 시 가압력 제어 방식에 따른 미세조직 및 용접특성 비교
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김원호, 김재훈, 전현욱, 김재원, 이은경, 지창욱
Korean J. Met. Mater.
2022;60(5):350-359. Published online 2022 Apr 22
DOI:
https://doi.org/10.3365/KJMM.2022.60.5.350
Abstract
Recently, lightweight vehicle bodies are in increasing demand to satisfy exhaust gas and environmental regulations around the world. In particular, aluminum alloys are widely used to manufacture lightweight parts, because of their excellent properties including corrosion resistance and mechanical properties. After the forming process, the welding process is important for.....
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박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
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김동국, 조용희, 이윤수, 김용유, 김형욱, 김정기
Korean J. Met. Mater.
2022;60(4):329-339. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.329
Abstract
The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in.....
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Ni-Cr-Mo-V계 저합금강의 미세조직과 기계적 특성에 관한 연구
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조무근, 류성현, 김경일, 김동응, 김정인, 김경택, 김상섭, 조규섭
Korean J. Met. Mater.
2022;60(4):251-262. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.251
Abstract
Ni-Cr-Mo-V steel alloys for high-speed railway brake discs were prepared to investigate the effect of alloying element contents on the microstructure and mechanical properties. The Cr, Mo, Mn alloying elements were incorporated into the steel alloys, which contained low carbon content in the range 0.16 wt.% ~ 0.21 wt.% to.....
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소결 방법에 따른 WC-20wt%Co 초경합금의 인장 특성 및 피로 수명
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류성현, 조무근, 김경일, 노우람, 홍익제, 이광희, 김상섭, 조규섭
Korean J. Met. Mater.
2022;60(3):227-236. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.227
Abstract
WC-Co cemented carbide has excellent mechanical properties and is widely used in many industrial applications including cold forging die and cutting tools. WC-Co cemented carbide is manufactured by liquid phase sintering (LPS), and a new sintering process for densification has been developed. In this study, cylindrical rod shaped tensile and.....
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초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
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강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater.
2022;60(3):169-179. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.169
Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive.....
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Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
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김경욱, 백민석, 어광준, 이기안
Korean J. Met. Mater.
2021;59(12):870-879. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.870
Abstract
Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative.....
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Cited By 1
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기계학습에 의한 Al-Si 주조 합금 미세조직 이미지 생성
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황인규, 이현지, 정상준, 조인성, 김희수
Korean J. Met. Mater.
2021;59(11):838-847. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.838
Abstract
In this study, we constructed a deep convolutional generative adversarial network (DCGAN) to generate the microstructural images that imitate the real microstructures of binary Al-Si cast alloys. We prepared four combinations of alloys, Al-6wt%Si, Al-9wt%Si, Al-12wt%Si and Al-15wt%Si for machine learning. DCGAN is composed of a generator and a discriminator......
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Al과 SnO
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혼합 분말을 사용한 일차원 Al과 Al
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나노/마이크로구조의 저온 성장
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이근형
Korean J. Met. Mater.
2021;59(9):677-681. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.677
Abstract
One-dimensional Al and Al
2
O
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nano/microstructures were fabricated via thermal oxidation of Al and SnO
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powder mixtures at temperatures below the melting point of Al (660 oC). Furthermore, the synthesis process was carried out in air at atmospheric pressure, which made the process very simple and easy. Sn metal particles with.....
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(K
0.5
Na
0.5
)NbO
3
-SrTiO
3
계에서 결정구조 및 미세구조 제어를 통한 유전특성 향상
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이성은, 권준형, 문경석
Korean J. Met. Mater.
2021;59(7):499-504. Published online 2021 Jun 16
DOI:
https://doi.org/10.3365/KJMM.2021.59.7.499
Abstract
Solid solutions and composites of a mixture of (K
0.5
Na
0.5
)NbO
3
(KNN) and SrTiO
3
(ST) were respectively synthesized by different process routes using a conventional solid state reaction. All starting materials were mixed simultaneously and calcined at 800
o
C for 4 h to obtain the solid solutions of KNN-ST. Meanwhile, the composites.....
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Cited By 1
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가시화 기반 Varestraint 시험을 이용한 CM247LC 초내열합금 용접 열영향부의 액화균열 민감도 평가 및 제어
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정예선, 김경민, 이형수, 서성문, 천은준
Korean J. Met. Mater.
2021;59(7):445-458. Published online 2021 Jun 11
DOI:
https://doi.org/10.3365/KJMM.2021.59.7.445
Abstract
The metallurgical aspects of weld cracking in Ni-based superalloys remain relatively unexplored in existing research. The present study performed comprehensive metallurgical and manufactural investigations into the weldability of an Ni-based superalloy, CM247LC, from the viewpoint of the liquation cracking behavior and its susceptibility. Metallurgical solutions to suppress the liquation-cracking susceptibility.....
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Cited By 1
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주철 미세조직 분석을 위한 합성곱 신경망에서의 중간층 시각화
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이현지, 황인규, 정상준, 조인성, 김희수
Korean J. Met. Mater.
2021;59(6):430-438. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.430
Abstract
We attempted to classify the microstructural images of spheroidal graphite cast iron and grey cast iron using a convolutional neural network (CNN) model. The CNN comprised four combinations of convolution and pooling layers followed by two fully-connected layers. Numerous microscopic images of each cast iron were prepared to train and.....
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Cited By 1
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CaO 첨가 AZ31 압출재의 개량된 미세조직이 인장, 고주기 피로 및 피로 균열 전파 특성에 미치는 영향
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김영균, 김민종, 황유진, 김세광, 임현규, 이기안
Korean J. Met. Mater.
2021;59(6):365-373. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.365
Abstract
The effect of tailored microstructures in 0.5 wt% CaO added AZ31 on tensile, high-cycle fatigue, and fatigue crack growth properties was examined. By adding CaO, the average grain size (AGS) was significantly reduced from 4.25±2.32 μm (conventional AZ31) to 2.42±1.60 μm (CaO-AZ31). The fineprecipitates of CaO-AZ31 were more evenly distributed.....
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Cited By 1
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Korean J. Met. Mater.
2021;59(6):357-364. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.357
Abstract
W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated.....
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Cited By 1
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초음파 분무 열분해법으로 제조한 텅스텐 미세분말의 미세조직과 소결 거동
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조현희, 김정현, 이영인, 정영근, 오승탁
Korean J. Met. Mater.
2021;59(5):289-294. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.289
Abstract
The powder microstructure and sintering behavior of W prepared by ultrasonic spray pyrolysis and spark plasma sintering were investigated. Fine-grained W powders were synthesized by ultrasonic spray pyrolysis using an ammonium metatungstate hydrate solution and hydrogen reduction. The XRD analysis of the powder, pyrolyzed below 600
o
C, showed tungsten oxide.....
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Cited By 1
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ZnS와 C의 혼합 분말을 열증발시켜 생성된 ZnO 나노/마이크로구조의 형상과 발광 특성에 미치는 ZnS/C 질량비의 영향
G
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-
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L
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이근형
Korean J. Met. Mater.
2021;59(4):262-267. Published online 2021 Mar 24
DOI:
https://doi.org/10.3365/KJMM.2021.59.4.262
Abstract
ZnO nano/microstructures were grown via a simple thermal evaporation process in air at atmospheric pressure. Mixtures of ZnS and carbon powders were used as the sources. The effects of growth temperature and mass ratio of carbon powder to ZnS on the morphologies and luminescence properties of the ZnO nano/microstructures were.....
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Cited By 1
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WC-12~22wt%Co 초경합금에서 미세조직 인자가 인장 성질에 미치는 영향
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류성현, 김경일, 노우람, 김상섭, 조규섭
Korean J. Met. Mater.
2021;59(3):201-208. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.201
Abstract
Cemented carbide is a kind of composite material in which fine particles of carbide are embedded into the matrix of a binder metal. It has a long service life because of its superior mechanical properties. In this study, the overall tensile behavior of a cemented carbide, WC-Co, was investigated by.....
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Cited By 1
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Ca와 Zr을 소량 첨가한 나노결정 Fe-Si-B-Cu계 합금의 미세조직변화와 자기적특성
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안수봉, 장수환, 박원욱, 손근용
Korean J. Met. Mater.
2021;59(3):168-176. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.168
Abstract
Nanocrystalline Fe-Si-B-Nb-Cu Finemet alloys show low saturation magnetic flux density compared to amorphous Fe-Si-B alloys. In the Fe-Si-B-Cu base amorphous alloys, Cu atoms form clusters which act as heterogeneous nucleation sites for α-Fe crystals. The addition of Ca element atoms, distributed along grain boundaries, helps inhibit grain growth and increase.....
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Cited By 1
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Fe-17Mn-5Si-5Cr 형상기억합금의 형상복원거동 및 기계적 특성에 미치는 Ni, Ti 및 C의 영향
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김도형, 김용환, 옥정중, 이정훈, 박찬희, 이욱진, 박용호
Korean J. Met. Mater.
2020;58(10):660-671. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.660
Abstract
Fe-Mn-Si based shape memory alloy is a new functional material that can be used to apply prestress to civil and structural components such as concrete structures. In this study, the effects of alloying elements Ni, C and Ti on the mechanical and shape memory properties of the alloy were investigated.....
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Cited By 5
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Fe 함량변화에 따른 텅스텐카바이드 초경소재의 특성평가
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김주훈, 이정한, 장준호, 오익현, 홍성길, 박현국
Korean J. Met. Mater.
2020;58(8):533-539. Published online 2020 Jul 27
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.533
Abstract
In this study, consolidated WC-Fe compacts as a function of Fe contents were fabricated by a spark plasma sintering method, following the mixed by the ball-milled powder. Fe among the metallic binders was added to WC enhance not only the driving force of sintering process but also suppressing the grain.....
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Cited By 5
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전북 완주 신풍유적 출토 초기철기시대 동검의 부식 및 제작특성
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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
Abstract
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.....
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Cited By 2
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열간가공된 TiAl 합금의 미세조직 제어가 기계적 특성에 미치는 영향
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김종훈, 김재권, 김성웅, 박용호, 김승언
Korean J. Met. Mater.
2020;58(7):459-465. Published online 2020 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.7.459
Abstract
The microstructure and mechanical properties of a newly developed, β-phase containing TiAl alloy have been studied through hot working and post heat treatment to enhance room temperature ductility and strength. The controlled microstructures hadthree types of structure, fully lamellar, nearly lamellar and duplex, and were produced by cyclic heat-treatment in.....
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Cited By 2
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분말 합금법으로 제조된 Ni-Cr-Al 초합금 다공체의 인장 특성에 미치는 변형률 속도 및 하중 방향 효과
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김규식, 배정석, 오재성, 이기안
Korean J. Met. Mater.
2020;58(6):375-382. Published online 2020 May 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.375
Abstract
The powder-alloyed metallic sheet foam manufacturing process has the advantage of being able to control pore shape, size, and distribution more easily and homogeneously than conventional foam manufacturing processes. The effects of strain rate and tensile direction on the mechanical properties of Ni-Cr-Al superalloy foam fabricated by powder alloying method.....
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고강도 API 라인파이프강의 저온 인성에 미치는 베이나이트계 미세조직의 영향
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이승완, 이상인, 황병철
Korean J. Met. Mater.
2020;58(5):293-303. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.293
Abstract
In this study the correlation between bainitic microstructure and the low-temperature toughness of high-strength API pipeline steels was discussed in terms of crack initiation and propagation in the microstructure. Three types of API pipeline steels with different bainitic microstructures were fabricated using varying alloying elements and thermo-mechanical processing conditions, and.....
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Cited By 6
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Zn계 합금도금재의 미세구조 및 내식성에 미치는 합금 조성 변화 영향
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이재원, 김성진, 오민석
Korean J. Met. Mater.
2020;58(3):169-174. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.169
Abstract
The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn
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binary eutectic, Zn/Al binary eutectoid and.....
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Cited By 2
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7003 알루미늄 합금의 기계적 성질 및 에너지 흡수능에 미치는 열처리 조건의 영향
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김희주, 정제기, 김수현, 임차용, 최윤석
Korean J. Met. Mater.
2020;58(1):7-16. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.7
Abstract
The effects of heat treatment conditions on the mechanical properties and energy absorption capacity of 7003 (Al-6Zn-0.6Mg) aluminum alloy were studied. The extruded material was heat treated at various temperatures to prepare annealed or aged specimens. Tensile tests, hardness measurements, electron backscatter diffraction characterizations, and differential scanning calorimeter analyses were.....
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Cited By 5
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Korean J. Met. Mater.
2019;57(12):817-827. Published online 2019 Nov 22
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.817
Abstract
The use of locally developed high performance alloys in power plants has become essential in the past ten years. Application of these alloys has been difficult because of a shortage of field demonstration testing, and the lack of lab-based test data. In this work, three types of locally developed heat.....
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Cited By 2
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Korean J. Met. Mater.
2019;57(12):755-763. Published online 2019 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.755
Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured head-hardened rail, and worn (used) rail) were compared to.....
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비기저면 집합조직을 가지는 마그네슘 합금의 고속압연 온도 변화에 따른 압연재 미세조직 변화
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이수진, 김예진, 이정훈, 박성혁
Korean J. Met. Mater.
2019;57(8):482-490. Published online 2019 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.482
Abstract
In this study, the effects of rolling temperature on the microstructural characteristics of a highspeed-rolled Mg alloy with a non-basal texture were investigated. To this end, commercial AZ31 alloy samples in which the basal poles of most grains were tilted at an angle of 45° from the normal direction (ND).....
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