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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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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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Korean J. Met. Mater.
2020;58(12):843-851. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.843
Abstract
In this study, oxide (Y
2
O
3
)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH
2
and the selective oxidation of Ni–YH
2
to Ni–Y
2
O
3
. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was.....
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Halide activated pack cementation에 의한 silicide 코팅층의 형성에 따른 Nb 합금의 산화거동
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양원철, 정중희, 이상엽, 백경호, 김영무, 이성, 박준식
Korean J. Met. Mater.
2020;58(8):507-514. Published online 2020 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.507
Abstract
In this study, we tried to improve the oxidation resistance of Nb-12Si (wt%) alloys at 1200 °C or higher through pack cementation coatings. Nb-12Si (wt%) alloys were prepared by arc-melting under Ar atmosphere. When the alloys were coated using pack powder mixtures composed of Si, Al
2
O
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and NaF, two silicide.....
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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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압연온도 및 어닐링 온도에 따른 5052합금의 미세조직 및 기계적 성질
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강의구, 남원종
Korean J. Met. Mater.
2019;57(10):632-640. Published online 2019 Sep 23
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.632
Abstract
The microstructural evolution and corresponding mechanical properties of 5052 Al alloys with different deformation temperatures and post-deformation annealing conditions were investigated. The warmrolled alloy showed higher strength and elongation than the cold-rolled and cryo-rolled alloys. The improved strength and ductility of warm rolled alloys is attributed to the formation of.....
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Cited By 1
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항복강도 390 MPa급 가공열처리강 대입열용접 열영향부 충격인성 및 연화현상
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방국수, 안영호, 정홍철
Korean J. Met. Mater.
2018;56(11):796-804. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.796
Abstract
The Charpy impact toughness of the heat affected zone (HAZ) of electro gas welded 390 MPa yield strength grade steel, manufactured by a thermo mechanically controlled process, was investigated. The effects of added Nb on the toughness of the steel and the factors influencing scatter in toughness are discussed in.....
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Cited By 1
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니켈기 Inconel 740H 초내열합금과 고Cr계 Gr.92 내열강의 이종금속 용접부의 미세조직 및 크리프 파단 특성
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신경용, 이지원, 한정민, 이경운, 공병욱, 홍현욱
Korean J. Met. Mater.
2018;56(5):375-383. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.375
Abstract
Microstructure evolution and the creep fracture characteristics of dissimilar welds between Ni-based superalloy Inconel 740H and High Cr ferritic steel Gr.92 were investigated. The dissimilar welds were fabricated by shielded metal arc (SMA) welding process with Ni-based austenitic Inconel 182 superalloy. Postweld heat treatment at 760
o
C for 4 hours.....
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Cited By 5
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반사도와 색 차 분석을 이용한 Cu-Zn 합금의 색 변화 고찰
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정연범, 홍성환, 박혜진, 김영석, 김정태, 이후담, 황윤중, 이영훈, 김기범
Korean J. Met. Mater.
2018;56(3):171-176. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.171
Abstract
The change in reflectivity of Cu-Zn alloys was investigated with the modulation of Zn content. The reflectivity of the prepared alloys were compared with pure copper and divided into wavelength regions corresponding to blue, green, yellow, and red colors. As the amounts of Zn increased, the difference in reflectivity of.....
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CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
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고준영, 송재숙, 홍순익
Korean J. Met. Mater.
2018;56(1):26-33. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.26
Abstract
The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at.....
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Cited By 4
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Nb 활용 탄질소 스테인리스강의 부동태 및 대기산화 피막 보호성 연구
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이창근, 하헌영, 이태호, 조경목
Korean J. Met. Mater.
2017;55(12):870-879. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.870
Abstract
The effects of Nb on grain refinement and the pitting corrosion resistance of Fe
balance
18Cr10 Mn0.3C0.3NxNb (x = 0.1 and 0.2 wt%) high interstitial alloys were investigated through microstructure analysis and potentiodynamic polarization tests. The resistance to pitting corrosion of the two alloys, covered with a passive film and an air-formed.....
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고엔트로피 합금의 제조 방법과 연구 동향: 리뷰
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임다미, 김형섭
Korean J. Met. Mater.
2017;55(10):671-683. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.671
Abstract
Abstract: High-entropy alloys (HEAs), which are defined as a single phase crystalline solid solution with the composition of each constituent element in the range of 5-35 at%, have been the subject of intensive study in the last decade. Most of the HEA research is focused on alloy design, microstructural characterization,.....
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Cited By 1
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K
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Korean J. Met. Mater.
2017;55(9):615-623. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.615
Abstract
Mill-annealed Ti-6Al-4V (Ti64) sheets were formed into rectangular shaped pans with two square recesses by the superplastic forming (SPF) technique under high pressure using commercial grade argon gas. The SPF process induced a significant decrease in the tensile ductility and high cycle fatigue (HCF) resistance of the Ti64 alloy. The.....
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22Cr-9Mo-3Fe-4Nb 니켈기 초내열합금의 저주기 피로에 따른 미세조직변화
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송영석, 석진익, 강정윤
Korean J. Met. Mater.
2017;55(9):609-614. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.609
Abstract
A new Ni based superalloy with high fatigue resistance and fine grain was considered as a material for high-pressure buckets in fossil fuel power plants. Since such buckets are usually exposed to extreme operating conditions, low cycle fatigue tests were conducted to understand the microstructure evolution of the material during.....
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Korean J. Met. Mater.
2017;55(7):486-491. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.486
Abstract
A new Ni based superalloy is considered as bucket material because of high fatigue resistance with fine grain. However a bucket is usually exposed to high temperature for a long time, so creep rupture tests were conducted to understand the microstructure evolution during creep deformation under various stresses at temperatures.....
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Cited By 1
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Alumina-Forming 오스테나이트계 스테인리스강의 냉간가공을 통한 미세 NbC 석출 촉진과 크리프 특성 향상
H
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박현화, 강전연, 하헌영, 이태호, 홍현욱
Korean J. Met. Mater.
2017;55(7):470-476. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.470
Abstract
A feasibility study on microstructure design has been carried out to improve creep rupture life in alumina-forming austenitic (AFA) Fe-14Cr-20Ni-2.3Al stainless steel with and without 2 wt% W addition. After creep tests under 780 °C/80 MPa conditions, it was observed that internal cracks initiated primarily from grain boundaries in the.....
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Cited By 3
F
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I
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마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
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심건주
Korean J. Met. Mater.
2017;55(5):296-307. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.296
Abstract
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is...
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Cited By 6
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Mg-RE계 고온용 합금의 특성과 최근 연구 동향
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남수우
Korean J. Met. Mater.
2017;55(4):213-221. Published online 2017 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2017.55.4.213
Abstract
For the applications in automotive, aircraft, aerospace, and electronic industries, the lightest structural Mg alloys have received much attention since 2000. There has been some progress for the improvement of the mechanical properties such as room temperature strength, formability and mechanical anisotropy. However, the high temperature strength of Mg alloys.....
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Cited By 3
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Ti 첨가 가속냉각형 고장력강의 용접열영향부 연화에 미치는 질소함량의 영향
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방국수, 정호신, 박찬
Korean J. Met. Mater.
2017;55(3):191-197. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.191
Abstract
The effects of nitrogen content on the HAZ softening of Ti-containing high strength steels manufactured by accelerating cooling were investigated and interpreted in terms of the microstructures in the softening zone. Regardless of their content, all of the steels investigated showed a softened zone 9-10 mm wide. The minimum hardness.....
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불연속 석출된 Al-Zn 합금의 상온 및 극저온 인발에 따른 미세조직 변화가 기계적 특성에 미치는 영향
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김민수, 한승전, 이재현, 임성환, 안지혁, 김상식, 김광호
Korean J. Met. Mater.
2017;55(2):77-84. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.77
Abstract
In order to study the effect of microstructural change on the tensile properties of discontinuous precipitated Al-Zn binary alloy, four different Al-Zn alloys(25, 30, 35, 45 wt% Zn) were aged at 160 ℃ for different aging times(0, 5, 15, 30, 60, 120, 360 min) after being solution treated at 400.....
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Cited By 3
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Korean J. Met. Mater.
2016;54(12):916-924. Published online 2016 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.12.916
Abstract
In this work, niobium (V) fluoride was selected as an additive to heighten the hydrogen sorption rates of Mg. Specimens of pure Mg, 5 wt% niobium fluoride－added Mg, and 10 wt% niobium fluoride-added Mg were prepared by planetary ball milling in hydrogen. The hydrogen sorption properties of the specimens were.....
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Cited By 5
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사워(Sour) 환경에서 고강도강의 내식성에 미치는 합금원소의 영향
Y
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현영민, 김희산
Korean J. Met. Mater.
2016;54(12):885-892. Published online 2016 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.12.885
Abstract
The effects of alloying elements (Mn, Cr, and C) on the corrosion resistance of steel were examined using weight loss test, polarization test in a sour environment, analysis of rust, and the prediction of stable corrosion product. Carbon was found to improve corrosion resistance after 7-day immersion, while manganese and.....
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Cited By 1
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연강에서 상온 변형 기구에 미치는 냉각 속도의 영향
S
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K
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김성수, 이윤상, 김영석
Korean J. Met. Mater.
2016;54(12):875-884. Published online 2016 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.12.875
Abstract
The deformation mechanism at room temperature in water quenched (WQ) and furnace cooled (FC) mild steels was investigated in a plane tilted 45° from the tensile direction, using electron back scattered diffraction, XRD, and TEM. The occurrence of (211) twinning was confirmed by pole figures and the slip systems were.....
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공정지도를 이용한 AA6082 합금의 연속 동적 재결정 및 고온 변형 거동
S
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이상민, 이지운, 최현진, 현승균
Korean J. Met. Mater.
2016;54(11):793-801. Published online 2016 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.11.793
Abstract
Torsion tests were performed on AA6082 samples to investigate their flow softening behavior and to determine optimum process conditions. Based on the experimental data and dynamic materials model, high strain processing maps were established which demonstrate the constitutive relationships among temperature, strain rate, strain and stress. The flow curves exhibited.....
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Cited By 6
Casting/Solidification/Heat Treatment
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다이캐스팅 공정에 사용된 개량형 STD61 열간 금형 표면의 미세조직에 관한 연구
H
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유하영, 이승준, 강민우, 이석진, 양원존, 정재석, 김병훈, 이영국
Korean J. Met. Mater.
2016;54(9):672-680. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.672
Abstract
The surface microstructure and crack formation of an aluminum die-casting mold were investigated. The mold was made of a modified STD61 steel, and was used for more than 165,000 cycles. The mold surface consisted of four layers; an oxidized layer, a decarburized layer, a network carbide layer and a tempered...
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Corrosion & Surface Treatment
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Korean J. Met. Mater.
2016;54(9):645-651. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.645
Abstract
Pure Mg, Mg-5wt%Ca, and Mg-5wt%Ca-1wt%Zn alloys were cast, and their high-temperature oxidation behavior was investigated to determine the roles of Ca and Zn in oxidation. Ca and Zn additions refined the microstructure by formation of Mg
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, respectively, at grain boundaries. Ca increased the oxidation resistance by forming a.....
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Cited By 2
Mechanical Behavior
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승용디젤엔진 실린더 헤드용 Al-Si-Mg-(Cu) 합금의 저주기 피로 특성에 미치는 첨가원소 효과
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진보라, 정창열
Korean J. Met. Mater.
2016;54(9):626-636. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.626
Abstract
To improve automobile fuel efficiency and reduce emissions, there has been a growing demand for more durable alloys for engine components with improved high temperature fatigue resistance. This study examined the effect of alloying elements on the high temperature mechanical behavior of Al-Si-Mg-(Cu) casting alloys for diesel cylinder heads. Depending.....
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Cited By 3
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