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설명 가능한 인공지능으로 해석한 Al-Sc-X 합금의 경도 예측 기계학습 모델과 역설계
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박지원, 김수현, 김지수, 김병주, 천현석, 오창석
Korean J. Met. Mater.
2023;61(11):874-882. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.874
Abstract
In this study, the Vickers hardness of precipitation-strengthened Al-Sc-X (X = Zr, Si, and Fe) alloys were predicted using machine learning models, depending on the alloys’ compositions, solid-solution treatment and aging conditions. The data used for machine learning were collected from the literature. Among the models, tree-based ensemble models such.....
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기계학습 모델 복잡도에 따른 템퍼드 마르텐사이트 경도 예측 정확도 비교 연구
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전준협, 김동응, 홍준호, 김휘준, 이석재
Korean J. Met. Mater.
2022;60(9):713-721. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.713
Abstract
We investigated various numerical methods including a physical-based empirical equation, linear regression, shallow neural network, and deep learning approaches, to compare their accuracy for predicting the hardness of tempered martensite in low alloy steels. The physical-based empirical equation, which had been previously proposed with experimental data, was labelled and used.....
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Web of Science 3
Crossref 3
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습식 소결 마찰재의 마찰특성에 대한 니켈 실리사이드 함량의 영향
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박태형, 김상욱, 김종균, 현승균
Korean J. Met. Mater.
2022;60(2):95-101. Published online 2022 Jan 12
DOI:
https://doi.org/10.3365/KJMM.2022.60.2.95
Abstract
The effect of nickel silicide on the friction properties of Cu-based wet sintered friction materials was investigated. The microstructure and mechanical properties of nickel silicide added Cu-based wet sintered friction materials were examined. Nickel silicide was prepared by mechanically alloying Ni and Si powder. Three types of Cu-based wet sintered.....
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텅스텐산암모늄 단계 생략 초경합금 슬러지 재활용 공정에 의해 제조된 텅스텐의 소결 및 경도 특성
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권한중, 신정민
Korean J. Met. Mater.
2022;60(1):53-61. Published online 2021 Dec 10
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.53
Abstract
In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the.....
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Web of Science 1
Crossref 2
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고용 강화 금속 바인더(Co
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권한중
Korean J. Met. Mater.
2022;60(1):14-25. Published online 2021 Dec 10
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.14
Abstract
The metallic binder in WC-Co hard metals was effectively strengthened using the solid solution phases of Co and W. These metallic phases of Co and W (Co
1-x
W
x
, x<1), which consist of two kinds of structures (FCC and HCP), were successfully formed by hydrogen reduction of milled oxides mixtures (Co
3
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4
and.....
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Web of Science 1
Crossref 2
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AISI 4115 강의 진공 침탄 시 아세틸렌 유량에 따른 침탄 거동
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권기훈, 문경일, 이영국, 정민수
Korean J. Met. Mater.
2020;58(9):617-625. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.617
Abstract
The vacuum carburizing behavior of AISI 4115 steel according to acetylene flow rates (1, 5, 10, 20, 30, 40, and 50 sccm) and temperatures (900, 950, and 1000
o
C) was quantitatively investigated through microstructure, carbon concentration and hardness analyses. As the acetylene flow rate increased, the penetration rate of carbon.....
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나노인덴테이션 방법으로 크롬 박막의 고유경도를 측정하는 방법과 영향 인자
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강영준, 백주환, 박현, 조영래
Korean J. Met. Mater.
2020;58(3):207-215. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.207
Abstract
Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer.....
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Web of Science 3
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펄스 전류 활성 소결에 의한 4YSZ-BN 복합재료 제조와 기계적 성질
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조우진, 김성은, 오세훈, 손인진
Korean J. Met. Mater.
2019;57(12):764-770. Published online 2019 Nov 22
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.764
Abstract
4YSZ is generally used in fuel cells, oxygen sensors, hip and knee joint replacements and thermal barriers because of it excellent properties, including low density, high biocompatibility, good resistance against corrosion, hard phase and high melting point, and high ionic conductivity. However, 4YSZ with large grain has low resistance to.....
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Web of Science 1
Crossref 1
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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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Web of Science 5
Crossref 5
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질산용액 및 질소가스 분위기에서 Ti-6Al-4V 합금의 레이저 표면질화 특성분석
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황태우, 한상욱, 오일영, 문영훈
Korean J. Met. Mater.
2019;57(7):412-421. Published online 2019 Jun 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.7.412
Abstract
Laser nitriding is a surface engineering technique that is being used on titanium alloys to improve their surface hardness and wear resistance. It is an attractive process because of its simplicity and the possibility of producing hard layers of substantial depth with minimum effect to the bulk of the material......
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Web of Science 3
Crossref 4
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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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Web of Science 6
Crossref 6
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오스테나이트 스테인리스강 튜브의 응력부식균열 민감도에 영향을 미치는 미세조직 및 잔류응력 비교
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이호중, 오승진, 김홍덕
Korean J. Met. Mater.
2019;57(1):51-59. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.51
Abstract
Three 304L austenitic stainless steel feedwater heater (FWH) tubes used in pressurized water reactors (PWRs) were investigated in this study. By comparing metallurgical differences, such as microstructural features, micro-hardness, and circumferential residual stress of the failed and non-failed FWH tubes by stress corrosion cracking (SCC), factors which could affect SCC.....
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Web of Science 5
Crossref 5
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Korean J. Met. Mater.
2018;56(9):658-663. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.658
Abstract
Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its.....
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Crossref 16
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레이저 용융 적층 기술을 이용한 AISI M4와 CPM15V 분말 적층부의 미세 조직 및 마모 특성에 관한 연구
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백경윤, 신광용, 이기용, 심도식
Korean J. Met. Mater.
2018;56(6):430-439. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.430
Abstract
AISI M4 and CPM15V are used as tool steels since they have high hardness and wear resistance. This study is concerned with die and mold hardfacing using laser melting deposition with M4 and CPM15V powders. For this purpose, the two types of metal powders were deposited on SKD11 base metal,.....
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Crossref 5
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Laser Cladding 공정으로 제조된 Ni-Cr-B-Si-C 코팅층의 미세조직 및 상온 마모 특성
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강태훈, 김규식, 박순홍, 이기안
Korean J. Met. Mater.
2018;56(6):423-429. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.423
Abstract
A Ni-Cr-B-Si-C coating layer was manufactured on a plate of Fe base alloy using a laser cladding process, and the microstructural and mechanical properties of the laser cladded coating layer and a Ni electroplating layer (used as a reference material) were investigated. To identify the microstructural and mechanical properties, scanning.....
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Crossref 6
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니켈기 초내열합금의 감마프라임상의 성장거동
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오준협, 조대영, 김홍규, 윤존도
Korean J. Met. Mater.
2018;56(1):8-13. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.8
Abstract
The mechanical properties of nickel-base superalloys used in disk and blade materials for gas turbine engines can be maximized by controlling their microstructure, such as the size of precipitates. In this study, we investigated the size of gamma prime precipitates after age hardening heat treatment at 650-980 oC for 1-48.....
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Crossref 2
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Al 5083 합금 용접부의 기계적 물성에 미치는 Mg의 영향
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김동윤, 김동철, 강문진, 김영민
Korean J. Met. Mater.
2017;55(10):716-723. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.716
Abstract
A new aluminum welding wire with 0.8 wt% higher in Mg content was developed and compared with commercial welding wire of the 5000 series. The weldability of the Al5083 base material was evaluated using high current metal inert gas (MIG) welding, using the developed Al5183 and commercial Al5183 welding wire......
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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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Korean J. Met. Mater.
2017;55(3):150-155. Published online 2017 Mar 3
DOI:
https://doi.org/10.3365/KJMM.2017.55.3.150
Abstract
In this study, the effect of α and β those stabilizers on the microstructure and phase transformation of cast Ti-6wt%Al-4wt%V alloy at various solution treatment temperatures was investigated. The dependence of the transformation behavior of the β phase during the solution treatment and its dependence was determined by the partitioning.....
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Crossref 3
Plastic Working & Materials Processing
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레이저 침탄공정시 철과 흑연의 혼합 슬러리가 침탄특성에 미치는 효과
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지원종, 이성훈, 문영훈
Korean J. Met. Mater.
2017;55(1):16-23. Published online 2017 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2017.55.1.16
Abstract
Laser surface carburizing can be achieved by a laser alloying mechanism, which includes melting the graphite coated substrate and dissolution of the graphite in the liquid state. The drawback of laser carburizing is that process-induced cracks frequently form on the carburized surface as a result of carbon enrichment and the.....
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Crossref 4
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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.....
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Crossref 3
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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Crossref 5
Casting/Solidification/Heat Treatment
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저합금강의 인코넬 625 육성용접 후 열처리에 따른 미세조직 및 기계적 특성
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김승필, 장재호, 김정수, 김병준, 손근용, 남대근
Korean J. Met. Mater.
2016;54(8):585-591. Published online 2016 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.8.585
Abstract
Overlay welding technique is one of methods used to improve metal mechanical properties such as strength, toughness and corrosion resistance. Generally, Inconel 625 alloy is used for overlay welding layer on low carbon steels for economic consideration. However, the method produces some problems in the microstructure of the cast structure...
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Crossref 2
Powder Metallurgy
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펄스전류 활성 소결에 의한 나노구조 TiC-TiAl 제조 및 기계적 성질
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곽봉원, 김병수, 윤진국, 홍경태, 손인진
Korean J. Met. Mater.
2016;54(8):566-572. Published online 2016 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.8.566
Abstract
TiC-Co or TiC-Ni hard materials have been used for cutting tools. However, the high cost and the low hardness of Ni or Co, and the low corrosion resistance of the TiC-Ni and TiC-Co cermets have generated interest in recent years in using them as alternative binder phases. In this study,.....
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Crossref 4
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