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Korean J. Met. Mater.
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단결정 Ni기 초합금의 결정방위에 따른 수소 취화 민감도 평가
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윤희수, 다오반헝, 권휴상, 이지훈, 남승훈
Korean J. Met. Mater.
2025;63(5):389-398. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.389
Abstract
As demand for hydrogen, a clean energy source, has increased, hydrogen embrittlement caused by hydrogen penetration into materials has became a major challenge. This study evaluated the effect of crystallographic orientation on hydrogen embrittlement sensitivity, using single-crystal Ni-based superalloys that are used in hydrogen gas turbines. The two crystallographic orientations.....
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다이어프램 밸브용 Co계 초합금 냉간 압연재의 상온 인장 특성에 대한 강화 메커니즘 연구
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박정현, 송노건, 최재호, 강두홍, 이기안
Korean J. Met. Mater.
2025;63(5):319-329. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.319
Abstract
Cold-rolled Co-Cr-Ni alloy (Elgiloy) and Co-Ni-Cr alloy (SPRON 510) can be considered for diaphragm valve materials in gas valve systems. In this study, the effect of direct aging (DA) heat treatment on the tensile properties of Co-based alloys was investigated and the influence of microstructural changes on the tensile behavior.....
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고질소 오스테나이트계 스테인리스강의 화학조성과 열처리 온도에 따른 석출거동 및 기계적 특성
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권기환, 김성훈, 조효행, 이진종, 하헌영, 이창훈, 정재석, 이태호, 강남현
Korean J. Met. Mater.
2025;63(2):143-151. Published online 2025 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.2.143
Abstract
The precipitation behavior and mechanical properties of high-nitrogen austenitic stainless steels were investigated for various chemical compositions and solution treatment temperatures. For this study, Fe-22.1Cr-12.2Ni-5.1Mn-2.1Mo alloys with three different sets of Nb, V, and N contents were prepared, and two distinct solution treatment temperatures were applied. An increase in Nb.....
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Ce 첨가가 Ti-6Al-4V 합금의절삭성에 미치는 영향
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김나영, 이욱진, 박찬희
Korean J. Met. Mater.
2025;63(1):75-84. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.75
Abstract
Ti alloys are difficult to machine, accounting for 50-75% of the final component price, necessitating urgent improvements in machinability to increase their demand in several fields. This study found that adding small amounts of Ce (0.1-2.0wt.%) significantly improves the machinability of Ti-6Al-4V alloy. Here, we systematically analyzed microstructural changes due.....
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Korean J. Met. Mater.
2025;63(1):33-42. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.33
Abstract
The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arc.....
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개량 Al-0.7Mn 합금의 미세조직, 부식 저항성 및 인장 특성
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황원구, 강태훈, 최호준, 신영철, 이승철, 이기안
Korean J. Met. Mater.
2024;62(11):886-896. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.886
Abstract
A modified alloy (Al-0.7Mn) was designed and fabricated with an increased Mn content up to 0.7wt.% and a controlled Fe content of 0.1wt.% and compared with the conventional Al3102 (Al-0.3Mn) alloy using the air-slip casting process. Both alloys were homogenized at 510°C for 10 hours and then air-cooled. The microstructure,.....
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Ni-Cr-Mo 저합금강에 Ta 합금이 폭발압접된 클래드 계면의 미세조직 및 기계적 특성 고찰
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김시연, 김태경, 장성진, 김동훈, 양성호, 홍현욱
Korean J. Met. Mater.
2024;62(11):857-867. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.857
Abstract
The effects of welding variables (stand-off distance and explosive thickness) on the interfacial microstructure evolution and mechanical properties of explosively welded Ta alloy to Ni-Cr-Mo low alloyed steel have been investigated. Regardless of welding conditions (a stand-off distance of 3-5 mm and explosive thickness of 40-80 mm), the Ta/steel interface.....
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Ni기 초내열합금 IN738LC의 응고속도와 열처리에 따른 미세조직 및 인장 특성
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김병훈, 공병욱, 주윤곤, 주영규, 홍현욱, 이재현
Korean J. Met. Mater.
2024;62(6):445-454. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.445
Abstract
The strength of Ni-base superalloys mainly depends on the γ' precipitates that improve the strength of the materials at high temperatures. The presence of γ' particles within the matrix restricts dislocation movement, and optimized heat treatments can tailor the size, shape, and volume fraction of γ'. In this study the.....
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Fe 함유 Al-10Si-Mg 주조 합금의 미세조직, 인장 및 열전도도 특성에 미치는 과열 처리의 효과
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장진혁, 강태훈, 어광준, 조영희, 이기안
Korean J. Met. Mater.
2024;62(5):402-410. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.402
Abstract
In this study, we designed and manufactured a new Fe-bearing Al-10Si-Mg casting alloy (F alloy) and investigated its microstructure, mechanical properties, and thermal conductivity. Two types of Fe-bearing Al-10Si-Mg alloys were used: the Conventional-F alloy, injected at 720 ℃ and cooled by water quenching, and the Superheated-F alloy, heated to.....
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Fe-15Mn-0.6C-2Al 쌍정유기소성강의 상온 노치 인장파괴 거동
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유상협, 정기채, 문희범, 이경훈, 박경태
Korean J. Met. Mater.
2024;62(5):325-333. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.325
Abstract
The tensile fracture behavior of an Al-bearing TWIP steel was investigated by conducting a series of tensile tests on smooth and notched specimens with different notch geometries, focusing on the effects of evolution of the stress triaxiality and the effective strain during deformation. The flow curve and digital image correlation.....
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Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
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최이슬, 오정목, 박찬희, 이욱진, 박용호, 원종우
Korean J. Met. Mater.
2024;62(3):171-179. Published online 2024 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.171
Abstract
This study demonstrates that the addition of the rare earth element Erbium (Er) significantly enhances the machinability and tensile properties of titanium (Ti). Pure Ti alloys and Er-added Ti alloys with 0.5-1.1 wt.% Er content were prepared, and their microstructure, machinability, and tensile properties were compared. Two different types of.....
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Web of Science 1
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Korean J. Met. Mater.
2024;62(1):57-64. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.57
Abstract
Carbon fiber reinforced polymer (CFRP) has been extensively used in civil engineering for applications such as reinforcing and retrofitting various architectural materials. Therefore, understanding the degradation of CFRP under high temperatures is important. This study aims to investigate the thermomechanical and microstructural properties of CFRP plates at elevated temperatures up.....
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Web of Science 1
Crossref 1
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WC-20wt%Co 초경 합금의 미세 조직 변화에 따른 인장 및 피로 성질
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조규섭, 김경일, 노우람
Korean J. Met. Mater.
2023;61(12):933-942. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.933
Abstract
WC-Co cemented carbide has excellent mechanical properties and is widely used in many industrial applications including cold forging dies and cutting tools. The tensile and fatigue properties of WC-20wt%Co cemented carbides with microstructural variations were investigated. Microstructure parameters such as Co binder content, WC particle size, binder mean free path,.....
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Korean J. Met. Mater.
2023;61(11):815-823. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.815
Abstract
The microstructure, tensile and fatigue properties of a martensitic stainless steel (MSS) plate with a thickness of 0.152 mm are investigated in this study. The microstructural properties were initially studied using electron backscatter diffraction microscopy. High dislocation densities were observed in the microstructure, along with the rolling texture revealed by.....
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Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2023;61(10):800-806. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.800
Abstract
Glass fiber-reinforced polymers (GFRPs) have attracted significant attention as structural materials because of their high fatigue resistance, corrosion resistance, strength, and stiffness. This study examined the effect of elevated temperatures (150, 250, 350, and 450oC) on the microstructural and mechanical properties of GFRP plates. The number of bubbles increased as.....
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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 3
Crossref 3
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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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Web of Science 5
Crossref 6
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미소 시편을 이용한 가스터빈 블레이드 사용품의 인장 및 미세조직 특성평가
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김영대, 하인생, 방지예, 정진성
Korean J. Met. Mater.
2022;60(11):865-871. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.865
Abstract
A gas turbine (GT) blade is a key hot-pass component for advanced GT engines, and should have stable properties under extreme conditions of 1,350°C and 3,600rpm, etc. The GT blade, after operating with nearly 800 equivalent start-stops (ES) or 24,000 equivalent operation hours (EOH), should be replaced due to degradation.....
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Web of Science 2
Crossref 3
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일방향응고한 GTD-111 초내열합금의 황 함량에 따른 미세조직 및 고온 기계적 특성
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강동수, 이형수, 윤대원, 정희원, 유영수, 서성문
Korean J. Met. Mater.
2022;60(10):782-792. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.782
Abstract
The influence of trace amounts of sulfur (S) on the microstructural evolution, tensile and creep properties in directionally solidified (DS) Ni-based superalloy GTD-111 were systematically investigated. Doping of S in the range of < 1 to 154 ppm resulted in the formation of a Ti
2
SC-type carbosulfide phase near the coarse.....
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Web of Science 2
Crossref 3
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과공정 Al-15wt.%Si 합금의 Primary Si 미세화와 인장 및 피로 특성에 미치는 EMS 공정의 영향
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백민석, 강태훈, 김종호, 박준표, 어광준, 이기안
Korean J. Met. Mater.
2022;60(5):360-369. Published online 2022 Apr 22
DOI:
https://doi.org/10.3365/KJMM.2022.60.5.360
Abstract
This study investigated the effect of the electromagnetic stirring (EMS) process on the microstructure and mechanical properties of hyper-eutectic Al-15 wt.%Si alloy. The tensile and high-cycle fatigue properties of the EMS Al-15wt.%Si alloy were examined and compared with conventional direct chill (DC) cast alloy. The initial microstructure of the as-cast.....
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Web of Science 3
Crossref 3
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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 10
Crossref 9
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소결 방법에 따른 WC-20wt%Co 초경합금의 인장 특성 및 피로 수명
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류성현, 조무근, 김경일, 노우람, 홍익제, 이광희, 김상섭, 조규섭
Korean J. Met. Mater.
2022;60(3):227-236. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.227
Abstract
WC-Co cemented carbide has excellent mechanical properties and is widely used in many industrial applications including cold forging die and cutting tools. WC-Co cemented carbide is manufactured by liquid phase sintering (LPS), and a new sintering process for densification has been developed. In this study, cylindrical rod shaped tensile and.....
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Web of Science 2
Crossref 3
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Korean J. Met. Mater.
2021;59(9):640-651. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.640
Abstract
The paper provides experimental details of the welding and specific examples of welding aluminum welding battery cans and conductive tabs for battery pack manufacture. In this study, we provide experimental details of a process for joining dissimilar materials used in sealing battery parts. A laser brazing technique was used for.....
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Web of Science 1
Crossref 1
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CaO 첨가 AZ31 압출재의 개량된 미세조직이 인장, 고주기 피로 및 피로 균열 전파 특성에 미치는 영향
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김영균, 김민종, 황유진, 김세광, 임현규, 이기안
Korean J. Met. Mater.
2021;59(6):365-373. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.365
Abstract
The effect of tailored microstructures in 0.5 wt% CaO added AZ31 on tensile, high-cycle fatigue, and fatigue crack growth properties was examined. By adding CaO, the average grain size (AGS) was significantly reduced from 4.25±2.32 μm (conventional AZ31) to 2.42±1.60 μm (CaO-AZ31). The fineprecipitates of CaO-AZ31 were more evenly distributed.....
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Web of Science 3
Crossref 2
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WC-12~22wt%Co 초경합금에서 미세조직 인자가 인장 성질에 미치는 영향
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류성현, 김경일, 노우람, 김상섭, 조규섭
Korean J. Met. Mater.
2021;59(3):201-208. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.201
Abstract
Cemented carbide is a kind of composite material in which fine particles of carbide are embedded into the matrix of a binder metal. It has a long service life because of its superior mechanical properties. In this study, the overall tensile behavior of a cemented carbide, WC-Co, was investigated by.....
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Web of Science 3
Crossref 3
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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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Web of Science 1
Crossref 2
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랜덤 트리 성장을 이용한 소성 경화 모델 개발방법 및 새로운 모델 제안
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손형서, 김영곤, 김진재, 김영석
Korean J. Met. Mater.
2020;58(11):741-751. Published online 2020 Oct 21
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.741
Abstract
The flow functions for plastic deformation have been developed to describe the plastic behavior of sheet metals. In order to explain the plastic behavior of material in metal forming processes via finite element analyses, two basic input functions should be applied. One is the yield function that determines the yielding.....
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분말 합금법으로 제조된 Ni-Cr-Al 초합금 다공체의 인장 특성에 미치는 변형률 속도 및 하중 방향 효과
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김규식, 배정석, 오재성, 이기안
Korean J. Met. Mater.
2020;58(6):375-382. Published online 2020 May 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.375
Abstract
The powder-alloyed metallic sheet foam manufacturing process has the advantage of being able to control pore shape, size, and distribution more easily and homogeneously than conventional foam manufacturing processes. The effects of strain rate and tensile direction on the mechanical properties of Ni-Cr-Al superalloy foam fabricated by powder alloying method.....
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Web of Science 1
Crossref 1
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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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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 6
Crossref 7
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