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가솔린 터보차저용 Alloy1.4957 내열강의 석출 상 분석
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이종관, 이병주, 이언식
Korean J. Met. Mater.
2023;61(10):721-728. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.721
Abstract
Recently, strengthened environmental regulations have required the downsizing of gasoline engines, and as a result, demand for gasoline turbochargers has rapidly increased. The vane of a turbocharger controls the flow of gases toward the turbine, and it is manufactured by powder metallurgy due to its complex shape. Gasoline engines have.....
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Korean J. Met. Mater.
2023;61(7):524-533. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.524
Abstract
A356 cast aluminum alloy contains 7 at.% Si and 0.3 at.% Mg, producing an approximately 50% eutectic microstructure. This high Si content and various casting conditions play a significant role in strengthening A356 alloy, by controlling the eutectic morphology and precipitates of other intermetallic compounds. Understanding how Si-related precipitates and.....
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Web of Science 1
Crossref 1
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Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화
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이승호, 윤종천, 어두림, 연시모, 최균석
Korean J. Met. Mater.
2023;61(6):397-403. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.397
Abstract
17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellent mechanical properties and excellent corrosion resistance, and is one of the materials used and studied with the powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that has recently attracted attention in.....
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증기발생기 전열관용 Alloy 690 소재의 크리프 특성에 미치는 탄화물 형성의 영향
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김형규, 홍석민, 김종민, 김민철, 이영국
Korean J. Met. Mater.
2023;61(4):301-309. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.301
Abstract
The creep properties of Alloy 690, used as a steam generator tube material in nuclear power plants, were evaluated at 650°C, 750°C, and 850°C. The parameters of creep life prediction models were derived using the Larson-Miller (LM), Manson-Haferd (MH), and Orr-Sherby-Dorn (OSD) models, to use as mechanical properties under a.....
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Korean J. Met. Mater.
2022;60(7):502-510. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.502
Abstract
There is growing interest in the recovery of pure palladium (Pd) compound from cemented Pd from spent electroplating solutions due to increasing demand for Pd, and there is considerable motivation to develop an efficient recovery process. In conventional methods of leaching Pd metal, HCl solutions containing oxidizing agents are employed......
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Web of Science 4
Crossref 4
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손성호, 이만승
Korean J. Met. Mater.
2022;60(4):291-300. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.291
Abstract
The recovery of valuable metals such as cobalt, nickel, and lithium from spent lithium-ion batteries (LIBs) has attracted much attention. In this study, a hydrometallurgical process for the recovery of high-purity lithium compounds like Li
2
CO
3
and Li
3
PO
4
from dust containing Li, Co, Ni, Cu, Fe, Mn, and Si produced during.....
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Web of Science 2
Crossref 3
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A7075-T6 합금에서 η' 석출상의 재고용이 기계적 특성에 미치는 영향
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김영위, 조용희, 이윤수, 김형욱, 이제인
Korean J. Met. Mater.
2022;60(1):83-93. Published online 2021 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.83
Abstract
The effects of dissolution of the η′ phase by solution treatment on the mechanical properties of A7075-T6 alloy were investigated. Immediately after solution treatment of the T6 sheet at 450
o
C or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After.....
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Web of Science 6
Crossref 7
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Al-Mg-Si 합금에서 열처리가 열확산도와 부식특성에 미치는 영향
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김유미, 최세원, 김영찬, 강창석
Korean J. Met. Mater.
2021;59(8):582-588. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.582
Abstract
The effect of the heat treatment on the Mg
2
Si phase in Al-Mg-Si alloy was investigated by a laser flash apparatus (LFA), Differential scanning calorimetry (DSC) and corrosion test. The alloy samples were solution treated at 590
o
C for a half hour followed by warm water quenching, and then aged in.....
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Web of Science 3
Crossref 5
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T6 열처리에 의한 Al-Mg-Si 합금의 비등방성 석출물 형상을 고려한 확률 의존적 석출강화효과
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최승규, 김광훈, 김진평, 김세훈, 손승배, 이석재
Korean J. Met. Mater.
2021;59(8):515-523. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.515
Abstract
This study proposed a constitutive equation to predict the change in yield strength according to the behavior of β″ metastable precipitates, which have a profound effect on strength among materials precipitated during the T6 heat treatment of Al-Mg-Si alloy. The β″ precipitate is a metastable phase before it becomes a.....
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Web of Science 5
Crossref 5
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수용액 기반 소듐 이온 배터리용 헥사사이아노철산 니켈의 전기화학 거동에 미치는 전해질내 음이온의 영향
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박성준, 전상은
Korean J. Met. Mater.
2020;58(12):896-906. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.896
Abstract
Nickel hexacyanoferrate (NiHCF) has a three-dimensional open framework structure, excellent long-cycling stability and rate performance as a cathode for aqueous sodium-ion batteries. However, the specific capacity of NiHCF is lower than that of present cathodes for aqueous batteries. A sodium-ion electrolyte was explored to achieve optimum capacity with NiHCF. Powder-type.....
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Web of Science 4
Crossref 3
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Cu-6 wt% Ni-1.4 wt% Si 합금의 압연 후 기계적 성질에 미치는 시효전 처리 영향
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이상진, 신현석, 최은애, 안지혁, 최윤석, 김상식, 이재현, 한승전
Korean J. Met. Mater.
2020;58(7):488-494. Published online 2020 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.7.488
Abstract
Cu-Ni-Si alloys were strengthened by Ni
2
Si intermetallic compound precipitation in a Cu matrix during aging. The Cu-6 wt% Ni-1.4wt%Si alloy was prepared by water quenching (solution treatment) or air cooling (homogenization treatment) after heating 980
o
C for 2 hours and aging at 500
o
C for 6 hours. After maintaining a.....
More
Web of Science 4
Crossref 5
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Korean J. Met. Mater.
2020;58(4):286-291. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.286
Abstract
In this work, LiOH was synthesized using highly soluble Li
2
SO
4
. To enhance efficiency, this synthesis was performed using the precipitation method, and the correlation between each experimental condition and the synthesis of LiOH was investigated. The particle size and crystalline properties were tailored by controlling various experimental conditions, including the.....
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Web of Science 5
Crossref 6
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음이온 교환막 수전해에 사용되는 Cu
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산소 발생 촉매의 합성 및 특성 분석
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박성민, 장명제, 박유세, 이주영, 정재엽, 정재훈, 최민관, 노유성, 서민호, 김형주, 양주찬, 김양도, 최승목
Korean J. Met. Mater.
2020;58(1):49-58. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.49
Abstract
In this study, we investigated the morphological, crystal structural, electronic structural, and electrocatalytic properties of the inverse spinel structured copper cobalt oxide (Cu
0.72
Co
2.28
O
4
) catalysts. The materials were prepared by coprecipitation using various copper and cobalt precursors, and subsequent oxidation treatment. Electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer Emmett.....
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Web of Science 11
Crossref 12
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폐니켈-카드뮴 침출용액으로부터 황화물 침전법을 이용한 카드뮴 회수에 대한 연구
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박일정, 김대원, 김민준, 정항철
Korean J. Met. Mater.
2019;57(11):726-731. Published online 2019 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.11.726
Abstract
A large amount of waste nickel-cadmium batteries are being produced, and various studies have been conducted to recover the valuable metals contained in the batteries. Solvent extraction is mainly used to recover nickel and cadmium, but that method has economic and environmental problems. In this study, to solve these problems,.....
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Web of Science 1
Crossref 1
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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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Crossref 1
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박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
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허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater.
2019;57(6):396-404. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.396
Abstract
The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet.....
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Web of Science 8
Crossref 9
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Cu-3.5 wt% Ti 합금의 석출 거동에 미치는 시효 전 가공의 영향
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조민아, 최은애, 안지혁, 손영국, 김광호, 이재현, 사토시 셈보시, 한승전
Korean J. Met. Mater.
2019;57(1):10-17. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.10
Abstract
Cu-Ti alloys were strengthened by Cu4Ti intermetallic compound precipitation in a Cu matrix during aging. The Cu-3.5 wt% Ti(Cu-4.6 at% Ti) alloys without deformation and with uniform and non-uniform deformation were aged at 450 oC for various times after solution treatment at 885 oC. The uniformly and non-uniformly deformed alloys.....
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Web of Science 10
Crossref 9
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Al 첨가가 Mg-7Sn-1Zn 합금 압출재의 미세조직과 인장 및 굽힘 특성에 미치는 영향
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김상훈, 이종언, 김예진, 최재옥, 이정훈, 박성혁
Korean J. Met. Mater.
2018;56(1):40-48. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.40
Abstract
The effect of Al addition on the microstructure and mechanical properties of extruded Mg-Sn based alloy is investigated by adding 1 wt% Al to the Mg-7Sn-1Zn alloy and indirectly extruding the billets with and without the Al addition. The Al addition promotes dynamic recrystallization (DRX) behaviour during hot extrusion, which.....
More
Crossref 7
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박판주조법으로 제조한 Al-0.6Mg-1.2Si 합금판재의 소부경화특성
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주기철, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater.
2017;55(12):853-861. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.853
Abstract
The effect of pre-aging treatment on the microstructure and mechanical properties of Al-0.6Mg-1.2Si aluminum alloy sheets fabricated by twin roll casting (TRC) was investigated. It was observed that two kinds of nanoclusters, cluster(1) and cluster(2), play an important role in the bake-hardening properties of Al-Mg-Si aluminum alloy. The hardness of.....
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Crossref 1
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불연속 석출된 Al-Zn 합금의 상온 및 극저온 인발에 따른 미세조직 변화가 기계적 특성에 미치는 영향
M
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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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Crossref 3
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SUH660합금의 미세조직 및 기계적 특성에 미치는 2차 시효 열처리의 영향
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김도훈, 이유환, 김정한
Korean J. Met. Mater.
2016;54(10):716-722. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.716
Abstract
nSUH660 is a precipitation hardening stainless steel which has high strength at moderately high temperature. In this study, the effect of a secondary aging-treatment after the standard 720 °C heat-treatment was investigated. The Rockwell C hardness test with detailed TEM observerations was performed to study the steel’s hardening mechanism. The.....
More
Crossref 3
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