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Ni기 초내열 개발 합금(LESS)의 고온 인장특성에 미치는 결정립계 형상의 영향
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신용관, 강병일, 윤정일, 권용남, 김영직
Korean J. Met. Mater.
2022;60(12):940-949. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.940
Abstract
In order to investigate the mechanical properties of the developed wrought γ'-hardened Ni-based superalloy, LESS alloy (Low Eta Sigma Superalloy), and to understand the deformation behavior, tensile tests were carried out from room temperature to 800oC in comparison with IN 740H alloy. Like other superalloys, the tensile properties of the.....
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Cited By 2
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동적재료모델을 활용한 STS 321 스테인리스강의 고온성형성 평가와 초기 미세조직의 영향
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조평석, 이재관, 황효운, 이용재, 이동근
Korean J. Met. Mater.
2022;60(12):892-901. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.892
Abstract
General austenitic stainless steel has a problem with intergranular corrosion due to volatilizing chromium, which forms chromium carbide in a high temperature environment. By adding titanium as an alloying element, STS 321 stainless steel has excellent creep resistance and intergranular corrosion resistance at high temperatures, because the formation of chromium.....
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STS 316L/A516-70N 클래드 판재의 용접방법에 따른 열영향부 형성과 기계적 물성 특성 평가 및 예측
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황철홍, 조명우, 김선환, 한두희, 유경훈, 김성웅, 김영주, 이상엽, 박준식
Korean J. Met. Mater.
2022;60(12):873-883. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.873
Abstract
Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and FCAW + GTAW (Gas tungsten arc welding) were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the welding speed of the FCAW + GTAW welding method is slower than that of the FCAW + FCAW.....
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Cited By 1
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극저온 연료탱크용 고망간강과 스테인리스강 316L 이종금속 용접부의 가스텅스텐아크 용접재료별 기계적 성질 및 미세조직
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조철호, 남성길, 유성훈, 최명환, 강남현
Korean J. Met. Mater.
2022;60(9):673-684. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.673
Abstract
The gas tungsten arc (GTA) weldability of high-Mn (HMn) steel and austenitic stainless steel (STS) 316L using dissimilar metal welds (DMWs) was investigated, to fabricate a fuel tank for an LNG-fueled ship. Three types of welding fillers, HMn steel, STS 309LMo and Inconel 625, were applied to the DMWs. The.....
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구영진, 이명현, 윤석영, 이윤주
Korean J. Met. Mater.
2022;60(4):321-328. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.321
Abstract
3D printing technology has advanced rapidly over the last decade. However, for ceramic materials, drying and sintering steps are required after printing, and excessive shrinkage that occurs during these steps is a major factor that has hindered the development of the ceramic 3D printing technology. In this study, a non-sintering.....
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고비강도와 고연신을 가지는 다중변형기구 하이엔트로피 합금 개발
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윤국노, 오현석, 이제인, 박은수
Korean J. Met. Mater.
2021;59(12):857-869. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.857
Abstract
In this study we developed a novel (TRIP+TWIP) high entropy alloy (HEA) with high specific strength and large ductility. First, by controlling the atomic constitution of the 3d transition metals (Cr, Mn, Fe, Co, and Ni), we designed a light-weight TRIP-assisted dual-phase HEA with a non-equiatomic composition of Cr
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, which.....
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유한요소해석을 이용한 AA1100의 변형 불균일성에 미치는 다축 단조 유형의 영향 연구
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김민성, 김정균, 유태현, 조유연, 이성, 정효태, 최시훈
Korean J. Met. Mater.
2021;59(9):624-639. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.624
Abstract
The effect of 3 forging routes (
Route A
- 1~12 passes by plane forging (PF) and reverse-plane forging (R-PF),
Route B
– 1~6 passes by PF and R-PF, 7~12 passes by diagonal forging (DF) and reversediagonal forging (R-DF),
Route C
– 1~12 passes by DF and R-DF) on maximum load.....
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Cited By 4
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저온 분사 공정으로 제조된 초고강도 Cu 벌크 소재의 인장 및 압축 변형 거동
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김영균, 이기안
Korean J. Met. Mater.
2020;58(11):759-767. Published online 2020 Oct 15
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.759
Abstract
In this study, high-strength pure Cu bulk material was manufactured using a cold spray additive manufacturing process, and its microstructure, tensile and compressive deformation behaviors were investigated and compared. The cold spray additive manufactured Cu bulk material showed a heterogeneous grain structure consisting of fine-grains and coarse-grains, and only α.....
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Cited By 1
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Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성
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채원기, 김봉규, 이종범, 한준현
Korean J. Met. Mater.
2020;58(10):703-714. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.703
Abstract
Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value.....
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Cited By 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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Cited By 1
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금속 재료의 국부 변형 거동 분석 방법과 연구 동향: 리뷰
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이민수, 전종배, 전태성
Korean J. Met. Mater.
2018;56(9):635-644. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.635
Abstract
The behaviour and performance of complex metallic materials (e.g., advanced high strength steel and dual phase Ti alloys) are acknowledged to be multi-scale in nature and to rely on the details of the threedimensional morphology, chemistry and crystallography at the meso-scale level and on macro-scale level geometry and boundary and.....
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Cited By 5
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Korean J. Met. Mater.
2017;55(10):710-715. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.710
Abstract
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation.....
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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
0
s
-1
. The results were compared with samples.....
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연강에서 상온 변형 기구에 미치는 냉각 속도의 영향
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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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Korean J. Met. Mater.
2016;54(11):831-837. Published online 2016 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.11.831
Abstract
Herein, we report the results of our investigation on the effect of friction and anvil design on the heterogeneous plastic-deformation characteristics of copper during the compressive stage of high-pressure torsion (HPT), using the finite element method. The results indicate that the friction and anvil geometry play important roles in the.....
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Cited By 3
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열연 590FB강의 일축인장 시 미소역학적 변형거동 및 파괴거동에 미치는 베이나이트의 강도계수의 영향
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김은영, 김성일, 최시훈
Korean J. Met. Mater.
2016;54(11):808-816. Published online 2016 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.11.808
Abstract
The effect of the strength coefficient (
K
B
) of bainite on micromechanical deformation and failure behaviors of a hot-rolled 590MPa steel (590FB) during uniaxial tension was simulated using the elasto-plastic finite element method (FEM). The spatial distribution of the constituent phases was obtained using a phase identification technique based on optical.....
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Cited By 6
Materials Analysis & Characterization
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미세쌍정의 투과전자현미경 해석
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류근걸, 하미영, 이강득
Korean J. Met. Mater.
2016;54(9):711-715. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.711
Abstract
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking.....
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Cited By 2
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