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유적지 출토 청동용기의 합금 조성과 제작기술 변화
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김소진, 김영도
Korean J. Met. Mater.
2024;62(12):996-1005. Published online 2024 Nov 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.996
Abstract
The purpose of this study is to analyze the components and observe the microstructure of 98 bronze vessels excavated from the Korean Peninsula, where such vessels were widely used, to identify the alloy composition and manufacturing process of bronze artifacts by period. In addition, we attempted to confirm the changing.....
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Tert-butyl alcohol의 동결주조에 의한 방향성 기공 함유 TiO
2
다공체 제조
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이의선, 오승탁
Korean J. Met. Mater.
2024;62(12):929-934. Published online 2024 Oct 7
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.929
Abstract
The effect of freezing conditions on the pore structure of porous TiO
2
fabricated using a freeze casting process with tert-butyl alcohol slurry was investigated. The raw powder was heat treated to manufacture a porous body with stable shape by suppressing volume change induced by the phase transformation of TiO
2
powder......
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단결정 초내열합금에서 HIP 처리가 크리프 특성에 미치는 영향
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원영완, 구지호, 이재현
Korean J. Met. Mater.
2024;62(10):766-776. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.766
Abstract
The Rene N5 is a second-generation single crystal superalloy containing 3wt% Re, commonly used in gas turbine blades for power generation at temperatures up to 1600°C due to its excellent creep life. Generally, single crystal (SX) and directionally solidified (DS) blades are not applied to hot isostatic pressing (HIP) because.....
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Korean J. Met. Mater.
2024;62(4):306-311. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.306
Abstract
In this study, we enhanced the flexural strength of cordierite ceramics by incorporating h-BN (hexagonal boron nitride) nanoparticles, facilitated by the slip casting process. Initially, commercial cordierite powder with an average particle size of 10 mm underwent a ball-milling process to reduce the size to 2.5 mm and simultaneously achieve.....
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연속주조 스테인리스강 슬라브의 결정립 조직 예측
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김희수, 김지준
Korean J. Met. Mater.
2023;61(1):60-68. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.60
Abstract
Macrostructural features in continuously-cast stainless steel slabs such as the distribution of equiaxed and columnar grains, and microporosity, are crucial to the post-processes, and the mechanical properties of the final steel products. Among the methods for controlling grain structure during the continuous casting process, the application of electromagnetic stirring (EMS).....
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Web of Science 3
Crossref 2
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박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
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김동국, 조용희, 이윤수, 김용유, 김형욱, 김정기
Korean J. Met. Mater.
2022;60(4):329-339. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.329
Abstract
The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in.....
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Web of Science 4
Crossref 4
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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 8
Crossref 9
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Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
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김경욱, 백민석, 어광준, 이기안
Korean J. Met. Mater.
2021;59(12):870-879. Published online 2021 Nov 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.12.870
Abstract
Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative.....
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Web of Science 2
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적층제조 공정으로 구현된 형상 적응형 냉각채널 적용 다이캐스팅 금형의 냉각성능 평가
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박유진, 김억수, 이정훈, 최지환, 윤필환, 강호정, 김동현, 박용호, 고종완
Korean J. Met. Mater.
2021;59(9):652-663. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.652
Abstract
A cooling channel with an optimized design provides not only high throughput with gravity die casting, but also guarantees product quality. A conformal cooling channel (CC) whose structure follows the shapes or surfaces of the mold cavity has attracted great attention in the die casting industry, because it allows rapid.....
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Web of Science 2
Crossref 2
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Korean J. Met. Mater.
2020;58(12):852-862. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.852
Abstract
Generally, molds are fabricated by the machining of massive billets of tool steels, such as AISI4140 or H13, but it has drawbacks, such as a large material loss and long-delivery time. The Wire-Arc Additive Manufacturing (WAAM) process could be an alternative fabrication method. It has the advantages of less material.....
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Web of Science 11
Crossref 13
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고압 다이캐스팅 Al-6Si계 합금의 인장특성 및 열전도성에 미치는 Ni과 Cu 첨가 영향
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장재철, 신광선
Korean J. Met. Mater.
2020;58(4):217-226. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.217
Abstract
In this study, the effects of nickel and copper on the mechanical and thermal properties of Al-Si alloys were investigated, for different alloy compositions. Thermodynamic calculations were carried out to predict the alloys’ solidification behavior (solidification temperature, solid fraction and physical properties (density, thermal conductivity, elastic modulus, bulk modulus)). The.....
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Web of Science 6
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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CBAPC 바인더로 제조한 인공사 중자의 강도 및 내습성에 미치는 P/Al 몰 비와 경화 조건의 영향
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오현곤, 박동국, 김양도, 이만식
Korean J. Met. Mater.
2019;57(12):808-816. Published online 2019 Nov 22
DOI:
https://doi.org/10.3365/KJMM.2019.57.12.808
Abstract
CBAPC (chemically bonded aluminum phosphate ceramic) binders have various advantages, including superior corrosion resistance and strength at high temperature. They are also a non-toxic and eco-friendly material. We investigated an inorganic binder based on CBAPC using artificial sand for casting. The CBAPC binders were synthesized with various P/Al molar ratios.....
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Crossref 1
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박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
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허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater.
2019;57(6):396-404. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.396
Abstract
The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet.....
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Web of Science 8
Crossref 9
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고압 다이캐스팅용 알루미늄 합금의 열전도성 및 주조성에 미치는 첨가원소의 영향
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김철우, 김영찬, 김정한, 조재익, 오민석
Korean J. Met. Mater.
2018;56(11):805-812. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.805
Abstract
High pressure die casting is one of the precision casting methods. It is highly productivity and suitable for manufacturing components with complex shapes and accurate dimensions. Recently, there has been increasing demand for efficient heat dissipation components, to control the heat generated by devices, which directly affects the efficiency and.....
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Crossref 12
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물유리계 바인더의 첨가제가 Al-Si7Mg 합금 주조 시 소착에 미치는 영향
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배민아, 김명환, 박정욱, 이만식
Korean J. Met. Mater.
2018;56(4):327-333. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.327
Abstract
Traditional organic binders used by the foundry industry produce problems such as generation of volatile organic compounds(VOCs), smoke and etc. A water glass binder system has been developed to improve the casting strength and to solve the environmental problems. However the water glass binder has a serious problem of sand.....
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Crossref 3
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박판주조법으로 제조한 Al-0.6Mg-1.2Si 합금판재의 소부경화특성
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주기철, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater.
2017;55(12):853-861. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.853
Abstract
The effect of pre-aging treatment on the microstructure and mechanical properties of Al-0.6Mg-1.2Si aluminum alloy sheets fabricated by twin roll casting (TRC) was investigated. It was observed that two kinds of nanoclusters, cluster(1) and cluster(2), play an important role in the bake-hardening properties of Al-Mg-Si aluminum alloy. The hardness of.....
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Crossref 1
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마그네슘 합금 박육 부품 다이캐스팅 주조시 오버플로우 형상 및 주입속도가 주조 품질에 미치는 영향
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권의혁, 권재홍, 김병철, 한정환
Korean J. Met. Mater.
2017;55(7):515-522. Published online 2017 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.7.515
Abstract
Casting defects such as gas traps and oxide particles must be removed in the die-casting process in order to obtain good cast products. Experimental research is costly and time-consuming, so computer simulations are typically performed in advance and then compared to experimental results. In this paper, a magnesium alloy die-casting.....
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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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초음파 용탕 처리 및 냉각속도가 Al-18Si-4Cu-3Ni 피스톤용 합금의 미세조직과 고온인장특성에 미치는 영향
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윤재희, 조영희, 정재길, 이정무, 박익민
Korean J. Met. Mater.
2017;55(6):396-404. Published online 2017 Jun 1
DOI:
https://doi.org/10.3365/KJMM.2017.55.6.396
Abstract
The influence of ultrasonic melt treatment (UST) combined with a change in cooling rates on the microstructure and elevated temperature mechanical properties of a hypereutectic Al-18Si-4Cu-3Ni piston alloy was investigated. Microstructural observation confirmed that UST effectively refined the sizes of primary Si and intermetallic compounds (e.g. ε-Al
3
Ni) while promoting their.....
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Crossref 2
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Fe-Mn-Al-Si-Sb-C 강의 고온산화에 미치는 Mn, Si, Sb 첨가효과
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박순용, 이동복
Korean J. Met. Mater.
2017;55(5):308-314. Published online 2017 May 9
DOI:
https://doi.org/10.3365/KJMM.2017.55.5.308
Abstract
High Mn twinning-induced plasticity (TWIP) steels with compositions of Fe-(18.0-18.17) Mn-1.51Al-(0.48-0.52)Si-(0.61-0.62)C-(0.52-0.54)Cr-(0.22-0.23)Ni-0.03Nb-(0-0.04)Sb (wt%) are oxidized at 650 ℃ and 750 ℃ for < 24 h in air in order to determine the effect of the alloying elements on the oxidation. They are oxidized parabolically to MnO
2
,Mn
2
O
3
,FeO,Fe
2
O
3
, and FeMn
2
O
4
oxides with relatively.....
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Crossref 1
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초음파 용탕 처리가 Al-7Si-0.35Mg 알루미늄 합금의 미세조직 및 기계적 특성에 미치는 영향
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김수배, 조영희, 이정무, 정재길, 임수근
Korean J. Met. Mater.
2017;55(4):240-246. Published online 2017 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2017.55.4.240
Abstract
The effect of ultrasonic melt treatment (UST) on the microstructure and mechanical properties of Al-7Si-0.35Mg (A356) casting alloys was investigated. The particular aim of this study was to analyze the mechanism involved in the strengthening of the A356 alloys when fabricated by UST. The UST had little effect on the.....
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Crossref 5
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Alloy 738 초내열합금 4 mm 두께 각관의 정밀주조 시 수축공 및 수축변위 해석 및 분석
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박명일, 김경민, 이영철, 이정석, 이재현, 유재현, 박상후, 최윤석
Korean J. Met. Mater.
2017;55(2):132-138. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.132
Abstract
Investment casting for the thin (4 mm thick) rectangular tube (40 mm wide, 80 mm high and 200 mm long) was carried out numerically and experimentally for Alloy 738, which is a precipitation-hardened Ni-base superalloy. Two types of rectangular tubes, one with a regular array (10 mm by 10 mm.....
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Materials Analysis & Characterization
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금속 미세조직의 3차원 이미지 관찰을 위한 순차적 박리 및 재구성 기술
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김수현, 임영목
Korean J. Met. Mater.
2016;54(9):698-710. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.698
Abstract
Experimental techniques for serial sectioning and reconstruction were investigated in the three-dimensional imaging of microstructures in metallic materials. Mechanical polishing equipped with a light optical microscope and a digital image processor was used for the serial sectioning and reconstruction. Different processing conditions were investigated for three different alloys: Al-Si alloy,.....
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Crossref 4
Casting/Solidification/Heat Treatment
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다이캐스팅 공정에 사용된 개량형 STD61 열간 금형 표면의 미세조직에 관한 연구
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유하영, 이승준, 강민우, 이석진, 양원존, 정재석, 김병훈, 이영국
Korean J. Met. Mater.
2016;54(9):672-680. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.672
Abstract
The surface microstructure and crack formation of an aluminum die-casting mold were investigated. The mold was made of a modified STD61 steel, and was used for more than 165,000 cycles. The mold surface consisted of four layers; an oxidized layer, a decarburized layer, a network carbide layer and a tempered...
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Corrosion & Surface Treatment
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Korean J. Met. Mater.
2016;54(9):645-651. Published online 2016 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.9.645
Abstract
Pure Mg, Mg-5wt%Ca, and Mg-5wt%Ca-1wt%Zn alloys were cast, and their high-temperature oxidation behavior was investigated to determine the roles of Ca and Zn in oxidation. Ca and Zn additions refined the microstructure by formation of Mg
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, respectively, at grain boundaries. Ca increased the oxidation resistance by forming a.....
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Crossref 2
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
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