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SA508 Gr.1A 저합금강의 기계적특성에 미치는 이상영역열처리 및 Pre-tempering 열처리의 영향
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현세미, 홍석민, 김민철, 김종민, 손석수
Korean J. Met. Mater.
2024;62(8):593-601. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.593
Abstract
To apply the leak-before-break (LBB) concept to the main steam line piping of nuclear power plants, the use of SA508 Gr.1A low-alloy steel is being considered. To increase the LBB safety margin, it is essential to improve the strength and toughness of the material. In this study, intercritical heat treatment.....
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Ti-Ni-Fe 합금의 R상 변태온도에 미치는 Fe 조성과 열처리 온도의 영향
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김원석, 금나영, 김진용, 김재일
Korean J. Met. Mater.
2024;62(4):251-256. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.251
Abstract
R-phase transformations in TiNi shape memory alloys (Nitinol) have various applications because of their small thermal hysteresis and low fatigue resistance. Adding a third element such as Fe or Al is one of the useful ways to induce R-phase transformation. Controlling the R-phase transformation temperature is crucial for industrial and...
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Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
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송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater.
2024;62(1):32-38. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.32
Abstract
Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni
3
Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While.....
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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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Web of Science 1
Crossref 1
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SA508 Gr.4N Ni-Cr-Mo계 고강도 원자로압력용기용 저합금강의 템퍼취화 거동에 미치는 이상영역 열처리의 영향
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홍석민, 이초롱, 이봉상, 김홍덕, 김민철
Korean J. Met. Mater.
2023;61(10):729-740. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.729
Abstract
To analyze the effects of intercritical heat treatment on the temper embrittlement of SA508 Gr.4N steels, two model alloys with different phosphorus (P) contents were fabricated. Each sample was heat treated by applying a conventional heat treatment process (quenching-tempering) with/without an intercritical heat treatment process (IHT) and a step-cooling heat.....
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Fe계 합금 용가재가 적용된 9% Ni강 용접 조인트의 미세조직과 기계적 특성에 미치는 용접 후 열처리의 영향
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최광수, 정효연
Korean J. Met. Mater.
2023;61(9):669-678. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.669
Abstract
A Fe-based filler material with the composition of Fe-20Ni-5Co-2.5Mn-0.2C was used for welding 9% Ni steel, and the effect of post-weld heat treatment on the microstructure and mechanical properties of the welded joints was investigated. Post-weld heat treatment of the welded joint was performed in the temperature range of 200.....
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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 2
Crossref 2
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Cu 및 Zr 첨가 A356 합금의 열처리 조건에 따른 상 변화와 기계적 특성 분석
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송태웅, 구자욱, 전승병, 정창열
Korean J. Met. Mater.
2023;61(5):311-323. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.311
Abstract
Cast A356(Al-Si-Mg) alloys are widely used in automotive and general applications because of their mechanical properties and castability. Al-Si-Mg-(Cu) alloys typically lose their strength above 170 o C due to coarsening of precipitates, which limits their application to components. To maintain their strength at elevated temperature, Al-Si-Mg-(Cu) alloys are modified.....
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Web of Science 1
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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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Web of Science 5
Crossref 6
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진공 원심 주조된 Ti-6Al-4V 합금의 주조 및 열처리에 따른 미세조직과 기계적 특성
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이현우, 공병욱, 김승언, 주윤곤, 윤석현, 이재현
Korean J. Met. Mater.
2022;60(4):282-290. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.282
Abstract
The Ti-6Al-4V alloy has been widely used for structural materials due to high specific strength property, however it is difficult to cast because of high reactivity at high temperature. In this study casting characteristics and post-casting heat treatment were studied in the cast Ti alloy. The cast alloy was prepared.....
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Web of Science 6
Crossref 9
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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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Web of Science 6
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1.25Cr-0.5Mo과 2.25Cr-1Mo 강의 동적 변형시효 거동에 미치는 합금원소 및 미세조직의 영향
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이요섭, 이호중, 이종현
Korean J. Met. Mater.
2021;59(11):769-780. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.769
Abstract
The effect of alloying elements and microstructure on the dynamic strain aging (DSA) behavior of 1.25Cr-0.5Mo (P11, ASTM 335Gr.P11) and 2.25Cr-1Mo (P22, ASTM 335Gr.P22) steels was investigated. For both steels, different cooling conditions such as air-cooling (AC) and oil-quenching (OQ) were applied. Tensile tests were conducted in the temperature range.....
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Web of Science 2
Crossref 2
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Si 및 Al 함량과 항온열처리조건이 초고강도 마르텐사이트-베이나이트 Fe-0.2C-2.0Mn 복합조직강의 미세조직과 인장특성에 미치는 영향
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이응혁, 유창재, 이홍범, 김지훈, 서동우
Korean J. Met. Mater.
2021;59(9):602-612. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.602
Abstract
This study investigated the influence of partial replacement of Si by Al on the microstructure and tensile properties of ultra-high strength steels with martensite-bainite complex microstructure produced by austenitization and subsequent isothermal heat treatment around M
s
temperature. When the isothermal heat treatment was done below the M
s
temperature, the fraction.....
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Web of Science 4
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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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Web of Science 2
Crossref 5
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레이저 직접적층법으로 제조된 Fe-8Cr-3V-2Mo-2W합금의 마모특성에 미치는 열처리공정 및 상대재의 영향
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하경식, 박영근, 김태환, 백경윤, 전종배, 심도식, 문영훈, 이욱진
Korean J. Met. Mater.
2020;58(10):680-692. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.680
Abstract
This study aimed to investigate the wear performance of laser direct energy deposited Fe-8Cr3V-2Mo-2W alloy under various wear environments, in terms of different heat treatment conditions. Ball on disk tribology tests were performed using high-carbon steel and zirconia balls as counter materials. The wear rates of the alloy depended significantly.....
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Web of Science 8
Crossref 10
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Alloy 282 초내열합금 모재 및 용접부의 기계적 특성과 미세조직에 미치는 시효열처리 조건의 영향
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방진혁, 강용준, 김남규, 서성문, 이상훈, 송상우, 강남현
Korean J. Met. Mater.
2020;58(8):540-549. Published online 2020 Jul 27
DOI:
https://doi.org/10.3365/KJMM.2020.58.8.540
Abstract
The effect of aging heat treatment conditions on the mechanical properties and microstructure of the base and weld metal of Alloy 282 superalloy was investigated. The aging heat treatment conditions employed in this study were as follows: two-steps (1010 °C for 2 hours plus 788 °C for 8 hours) and.....
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Web of Science 5
Crossref 3
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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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Web of Science 7
Crossref 6
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온도 제어형 레이저 열처리에 따른 NiCrBSi 및 CoCrWC 용사 코팅층의 나노구조 형성 거동
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천은준
Korean J. Met. Mater.
2020;58(4):247-256. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.247
Abstract
.For surface hardening of a continuous casting mold component, a thermal spray coating of NiCrBSi (Metco-16C) and CoCrWC (Stellite-1) was performed followed by laser heat treatment of the coatings. To support selective modification of the thermal spray coating, a metallurgically determined surface temperature was maintained during the laser heat treatment,.....
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Web of Science 4
Crossref 5
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Strip Casting 공정으로 제조된 Al 3003 합금의 미세조직, 인장 및 피로 특성에 미치는 후열처리 영향
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백민석, 어광준, 정창열, 이기안
Korean J. Met. Mater.
2020;58(3):151-161. Published online 2020 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.151
Abstract
Al 3003 alloy was manufactured by strip casting process, and the effect of post heat-treatment on tensile and fatigue properties was investigated. The strip cast Al 300 alloy exhibited a unique globular shaped rapid-cooled solidification structure, and the microstructural characteristic remained after heat-treatment. Asstrip cast (F) and heat-treated (O) alloys.....
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Web of Science 4
Crossref 4
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레이저 가공 기반 사출 금형강의 선택적 표면 개질 연구: 레이저 나이트라이딩에 따른 AlN 형성 및 경화 거동
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천은준, 박창규, 박원아
Korean J. Met. Mater.
2020;58(1):32-40. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.32
Abstract
Laser surface heat treatment and laser nitriding processes were applied using selective surface modification techniques to investigate phase transformation, microstructural evolution, and surface hardening behaviors for two types of plastic injection mold steels, AISI 1045 and P21. During laser surface heat treatment, a 245% hardness increase compared to that of.....
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Web of Science 5
Crossref 5
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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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Web of Science 6
Crossref 6
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열처리 및 HIP 공정을 이용한 가스터빈 고온부품 재생시 미세조직 및 기계적 특성 변화
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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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Web of Science 1
Crossref 1
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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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Web of Science 5
Crossref 3
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초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
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황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater.
2019;57(6):335-342. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.335
Abstract
The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but.....
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Web of Science 1
Crossref 1
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Selective laser melting 공정으로 제조된 AISI 316L 합금의 상온 및 고온 압축 변형 거동
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함기수, 박순홍, 이기안
Korean J. Met. Mater.
2019;57(5):295-303. Published online 2019 May 5
DOI:
https://doi.org/10.3365/KJMM.2019.57.5.295
Abstract
This study investigated the microstructure and compressive properties (at room & high temperatures) of Fe-Cr-Ni based AISI 316L alloy, manufactured by selective laser melting process. The effect of stress relieving heat treatment on the microstructure and mechanical properties also examined. Regardless of the stress relieving heat treatment, the SLMed AISI.....
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Web of Science 3
Crossref 3
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Cr강의 미세조직과 파괴인성에 미치는 열간단조 및 열처리 공정의 영향
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이동준, 권용남, 김민석, 구가은, 허상현, 김남용, 이진모
Korean J. Met. Mater.
2018;56(3):221-226. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.221
Abstract
In this study, the effects of hot forging and heat treatment (quenching and tempering) of cast Cr alloy steel on the microstructures and mechanical properties were investigated. The hot forging was performed at a compressive ratio 0.5 at 1,250
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C. The heat treatment process was quenching (860
o
C for 2.....
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STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
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장대한, 김광윤, 김형찬, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater.
2017;55(9):664-670. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.664
Abstract
Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is.....
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Crossref 7
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Invar 36 합금 선재의 미세조직에 미치는 냉간 인발 및 열처리 공정의 영향
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한승엽, 장선아, 은희철, 최정훈, 이기락, 박환서, 안도희, 김수영, 김재열, 신상용
Korean J. Met. Mater.
2016;54(10):759-767. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.759
Abstract
In this study, the effect of cold drawing and heat treatment on the microstructure of Invar36 alloy wire was investigated. Invar36 alloy wire is used as a transmission line core material, and is required to have high strength. The diameter of the Invar36 alloy wire specimens were reduced from 16.....
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Crossref 2
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
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