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회귀기반의 동적재료모델을 이용한 Inconel 718 합금의 고온 변형 거동 분석 및 Ring rolling 공정의 적용
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양선영, 박진욱, 윤준석, 이광석, 이동근, 신다슬
Korean J. Met. Mater.
2024;62(2):81-93. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.81
Abstract
Inconel 718 nickel-based alloy is extensively used in the aerospace industry (e.g., gas turbine engine components) because of its excellent corrosion resistance and high mechanical properties at elevated temperatures. However, there is a certain limit to manufacturing the alloy through plastic deformation due to its high deformation resistance and complicated.....
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일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
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최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater.
2023;61(12):951-957. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.951
Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature.....
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CuCrFeMnNi 고엔트로피 합금의 열처리에 따른 미세조직 및 기계적 물성 변화 연구
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송호섭, 송성호, 조재영, 송기안
Korean J. Met. Mater.
2023;61(6):449-457. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.449
Abstract
High entropy alloys (HEAs) are defined as a multi-element alloy including more than 4 elements with near equi-atomic percentage. In general, the configurational entropy of the HEAs is known to be sufficient to stabilize a single solid solution, such as body-centered cubic (BCC), face-centered cubic (FCC) and hexagonal-closed pack (HCP)......
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균질화 AA 2026 합금의 고온 변형과 미세 구조 변화
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강현우, 김수빈, 장병록, 김희국
Korean J. Met. Mater.
2023;61(5):338-346. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.338
Abstract
AA 2026 is an improved version of AA 2024, an alloy with added Zr to reduce Fe and Si content and inhibit recrystallization during hot working. Al 2026 alloy has high strength and high damage resistance, so it is widely used in aircraft parts. In this study, in order to.....
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Web of Science 1
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고강도 냉간압조용 중탄소 Cr-Mo 합금강의 고온변형특성 및 동적재결정 거동 평가
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조용덕, 이희주, 남성실, 강현우, 장병록
Korean J. Met. Mater.
2022;60(6):423-431. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.423
Abstract
The hot deformation behavior of medium-carbon Cr-Mo alloy, which has been developed for high strength cold-heading quality wire rod, was investigated to evaluate its hot workability. A flow curve was derived using the hot torsion test, under conditions with temperatures of 1173-1273 K and strain rates of 0.1-1.0 s
-1
. At.....
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Web of Science 2
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최진주, 임병용, 강유빈, 김대근
Korean J. Met. Mater.
2021;59(11):796-801. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.796
Abstract
Compressed wires are produced by cross-sectionally compressing stranded conductors, which results in a smaller conductor diameter. This also leads to a lower weight wire, because a thinner external insulated coating can be used, compared to the low-voltage wires typically used in automobiles. However, a post production heat treatment of the.....
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Zr-2.5%Nb 압력관 재료에서
α
-Zr 영역에서의 소둔에 의한
β
-상 분해가 재결정에 미치는 영향
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김성수, 임상엽, 이경근
Korean J. Met. Mater.
2020;58(10):672-679. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.672
Abstract
The effects of β phase decomposition on recrystallization and texture variation in Zr-2.5% Nb alloy pressure tube material were investigated. Isothermal annealing was conducted at 350 to 550
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Web of Science 1
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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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Web of Science 2
Crossref 3
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고온 변형 곡선을 이용한 동적 재결정 해석과 동적 상변태의 조기 예측
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박노근
Korean J. Met. Mater.
2018;56(11):779-786. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.779
Abstract
There have been previous attempts to observe the occurrence of dynamic ferritic transformation at temperatures even above Ae3 in a low-carbon steel, and not only in steels, but recently also in titanium alloys. In this study, a new approach is proposed that involves treating true stress-true strain curves in uniaxial.....
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Crossref 1
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온간 압연 및 냉간 압연으로 제조한 AZ31 마그네슘 합금 판재의 집합조직 및 성형성 비교
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조수미, 유봉선, 김영민
Korean J. Met. Mater.
2018;56(10):734-744. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.734
Abstract
The microstructure, texture evolution, and room temperature formability of warm-rolled and coldrolled AZ31 magnesium sheets were investigated in this study. The localized deformation regions, i.e., shear bands, formed during warm-rolling and cold-rolling mainly provide nucleation sites for recrystallization, but the orientation of the recrystallized grains nucleated on the shear bands.....
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Crossref 5
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냉간압연 된 304 오스테나이트 스테인리스강의 열처리에 의한 기계적 특성 평가
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박민하, 김광윤, 장재호, 김형찬, 문형석, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater.
2018;56(7):490-498. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.490
Abstract
Austenitic stainless steels are widely used in a variety of industries, such as power plants, aerospace, automotive, construction and electronics, due to their excellent mechanical properties including ductility, toughness and corrosion resistance. For application in various industries, many parts and products require plastic processes such as cold rolling, cold forging.....
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Crossref 4
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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.....
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Crossref 7
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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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니켈감량 Fe-22Cr-9.5Mn-3.3Ni 오스테나이트강 주조재의 고온 변형성
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안상연, 송재숙, 홍순익
Korean J. Met. Mater.
2017;55(7):477-485. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.477
Abstract
The hot deformation behavior of as-cast and homogenized Fe-22Cr-9.5Mn-3.3Ni stainless steel was investigated over a temperature range between 600~1,250 ℃. The deformability of the as-cast Fe-22Cr-9.5Mn-3.3Ni steel decreased with increasing temperature up to 850 ℃, and then increased at temperatures between 900 and 1200 ℃ caused by dynamic recrystallization at.....
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전자기주조법으로 제조된 Al-12Si계 합금의 미세조직 및 고온 소성변형 거동
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전경수, 노흥렬, 김목순, 김종호, 박준표
Korean J. Met. Mater.
2017;55(6):386-395. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.386
Abstract
An as-received EMC/S (electromagnetic casting and stirring)-processed Al-12Si based alloy billet was homogenized to examine its microstructure and high temperature plastic deformation behavior, using compressive tests over the temperature range from 623 to 743 K and a strain rate range from 1.0×10
-3
to 1.0×10
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s
-1
. The results were compared with samples.....
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공정지도를 이용한 AA6082 합금의 연속 동적 재결정 및 고온 변형 거동
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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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Crossref 8
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