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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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통일신라 청동용기류의 제작기술 고찰: 부여 관북리 백제유적 출토 유물을 중심으로
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김소진, 한우림, 김영도
Korean J. Met. Mater.
2024;62(5):393-401. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.393
Abstract
Archaeological excavations in Buyeo had revealed Bronze vessels interred within a hole in the building at the Gwanbuk-ri site. These bronze vessels are dated to the Unified silla period (9-10th centuries). To identify the bronze vessels’ manufacturing technology, metallurgical analyses were carried out using Optical Microscopy, SEM-EDS and EPMA. The.....
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방전 플라즈마 소결법으로 제조된, AlN-MgO 소결체의 미세구조와 열적, 기계적 특성
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모한첸, 정명진, 안정원, 신승용, 박윤휘, 김선래, 남수용, 이우재, 권세훈
Korean J. Met. Mater.
2024;62(5):367-376. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.367
Abstract
AlN-MgO composites with different compositions were prepared by spark plasma sintering, and the effects of their composition on their microstructure, thermal properties, and mechanical properties were systemically investigated. MgO compositions in the AlN-MgO composites were controlled from 20 to 80 wt%. The results indicated that a phase transition did not.....
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선택적 레이저 용융 Ti6Al4V-Equine Bone 나노 복합재료의 마찰 및 마모 특성
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김세희, 배수현, 박상배, 선우훈, 신세은
Korean J. Met. Mater.
2024;62(5):351-359. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.351
Abstract
Ti6Al4V is commonly used in implants because of its excellent mechanical properties, corrosion resistance, and biocompatibility. While Hydroxyapatite (HAp) is typically used for strong biological bonding between Ti6Al4V implants and bone tissue, this study takes a different approach by incorporating Equine Bone (EB), which has a chemical structure similar to.....
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금속산화물 분말의 수소환원에 의한 W-Ni-Cu 합금분말의 합성
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허연지, 이의선, 최지원, 변종민, 오승탁
Korean J. Met. Mater.
2024;62(5):334-339. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.334
Abstract
The effect of powder processing on the microstructure and sinterability of the heavy alloy W-Ni-Cu was investigated. The heavy alloy powders were prepared by the ball milling and hydrogen reduction of metal oxide powders. As the milling time increased, the size of the powder mixture decreased and at 5 h.....
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Korean J. Met. Mater.
2024;62(4):292-298. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.292
Abstract
Poly(3-hexylthiophene) (P3HT), a semiconducting polymer, is integral to the development of organic electronic devices. Its optoelectronic properties are significantly influenced by the nature of its intermolecular interactions, predominantly classified as J-type and H-type couplings. This study investigates the effect of sonication on the dielectric properties of P3HT, focusing on the.....
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유연 압저항 센서에 적용되는 나노 소재 및 구조 설계에 대한 최신 연구 동향
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강여울, 이정우
Korean J. Met. Mater.
2024;62(3):239-249. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.239
Abstract
This review provides an overview of recent advances in the materials and structural design of flexible piezoresistive sensors, which are of significant interest as smart devices in the Fourth Industrial Revolution. Recent research has focused on addressing demand for a wide pressure range and high sensitivity for use in diverse.....
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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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Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
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김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석
Korean J. Met. Mater.
2024;62(2):132-141. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.132
Abstract
The effect of solution temperature and quench delay on the microstructure and mechanical properties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanning calorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens were held at 500 and 540
o
C, respectively, for 80 min for solutionizing.....
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Ni-Fe bimetallic oxides 촉매의 CO, NO 가스상 오염물질 동시저감 특성
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김운기, 정재일, 이명진, 정보라, 예보라, 이희수, 김홍대
Korean J. Met. Mater.
2024;62(2):115-124. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.115
Abstract
Many studies have been conducted on methods to remove air pollutants. Among them, a representative commercial technology for reducing nitrogen oxides (NO
X
) is selective catalytic reduction (SCR) using NH
3
as a reductant. However, the NH
3
-SCR technology has problems, such as the need for additional NH
3
gas (Active-SCR), the fact that.....
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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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CMSX-4 초내열합금 용접 응고균열 거동에 미치는 단결정 성장 및 응고결정립계의 영향
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김경민, 정예선, D.V. Kiran, 권석환, 서성문, 천은준
Korean J. Met. Mater.
2024;62(1):22-31. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.22
Abstract
Single-crystal superalloys have been popularly employed in high-temperature parts of gas turbines, such as blades. However, the welds of such alloys are highly susceptible to solidification cracking, which limits their applicability to high-temperature turbine blades. In this study, the effects of characteristics of weld solidification on solidification cracking susceptibilities (solidification.....
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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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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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API 강재에 첨가된 미량의 합금원소(Cr, Mo)가 CO
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포화염수 환경 내 부식거동에 미치는 영향
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윤덕빈, 방혜린, 김완근, 김성진
Korean J. Met. Mater.
2023;61(12):896-908. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.896
Abstract
This study examined the effects of minor alloying elements (Cr and Mo) on the corrosion behaviors of API grade steel in CO
2
-saturated near-neutral aqueous solutions. Various experimental and analytical methods were applied to gain insights into the underlying CO
2
corrosion mechanism of the steels. The findings revealed that steel with.....
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염수환경 내 해드필드강 용접열영향부의 부식 및 침식-부식 거동에 미치는 Cr 첨가의 영향
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진승우, 박진성, 윤덕빈, 이상철, 최종교, 오민석, 김성진
Korean J. Met. Mater.
2023;61(12):883-895. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.883
Abstract
The corrosion and erosion-corrosion behaviors in the weld heat-affected zone (HAZ) of Hadfield steels with varying Cr contents (1, 2, and 3 wt%) were examined. Various experimental methods, including electrochemical polarization, impedance, and weight loss measurements, were utilized. Two types of isothermal heat treatments were conducted in a box furnace.....
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Korean J. Met. Mater.
2023;61(11):867-873. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.867
Abstract
Commercial AA1070 alloy for electrical wire is severely deformed by the drawing process when a rod with a diameter of 2 mm is greatly reduced to 0.4 mm by multi-pass. Changes in the microstructure, mechanical properties, and electrical properties of the Al alloy during the wire-drawing process were investigated in.....
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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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레이저 직접 적층 공정으로 제조된 Inconel 625 초합금의 미세구조 및 기계적 특성에 공정 변수 및 스캔 전략이 미치는 영향
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남현지, Qing-Ye Jin, 박지영, 이욱진
Korean J. Met. Mater.
2023;61(10):772-784. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.772
Abstract
This study aimed to investigate the effect of process parameters on the microstructure and mechanical properties of Inconel 625 alloy manufactured by direct energy deposition process. The Inconel 625 samples were produced by varying the laser scanning speeds from 720 - 960 mm/min while maintaining the same the laser energy.....
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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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산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
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강태진, P.L. Narayana, 최성우, 김재혁, 홍재근, 이태경
Korean J. Met. Mater.
2023;61(9):714-720. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.714
Abstract
Titanium alloys are used in many fields including military, aerospace, and biomedical because of their excellent specific strength, corrosion resistance, and biocompatibility. Recently, much research has been focused on addressing the disadvantages of conventional manufacturing methods, including reducing material and energy waste when manufacturing titanium alloy parts by additive manufacturing.....
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Web of Science 2
Crossref 4
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항복강도 70 ksi급 전기저항용접 강관의 입열량 및 심 어닐링 온도에 따른 미세조직과 저온충격인성 상관관계 고찰
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김태훈, 김치원, 이찬희, 곽진섭, 전동현, 홍현욱
Korean J. Met. Mater.
2023;61(9):659-668. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.659
Abstract
In this study, the influence of heat input and post-seam annealing (PSA) temperature on the microstructure and impact toughness of electric resistance welded (ERWed) API X70 steel pipe was investigated. The ERW seam welds of pipes were fabricated with low, moderate, and high heat inputs, and followed by the PSA.....
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Korean J. Met. Mater.
2023;61(9):652-658. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.652
Abstract
A cold roll-bonding (CRB) process is applied to study the effects of stacking number on the microstructure and mechanical properties of roll-bonded and age-treated Al sheets. Commercial AA1050 and AA6061 sheets with a thickness of 2 mm were stacked alternately on each other to two and four layers, and roll-bonded.....
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Web of Science 3
Crossref 4
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Twin wire arc spray 용사코팅 공정을 통해 제작된 미끄럼 방지 코팅의 열적 특성 및 고온노출 거동 연구
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권한솔, 박영진, 남욱희, 변응선
Korean J. Met. Mater.
2023;61(9):642-651. Published online 2023 May 14
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.642
Abstract
Conventional non-skid coatings for marine construction contain polymeric materials. These materials are generally susceptible to high temperature environments because of their low thermal conductivity and thermal resistance. A metal-based non-skid coating has great potential for high temperature applications, yet, there has only been limited research. In this study, twin wire.....
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Web of Science 1
Crossref 1
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해양구조용 18Mn(V, Mo)강 내 Cr 첨가가 해수환경 내 부식-마모 복합거동에 미치는 영향
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윤덕빈, 박진성, 이상철, 최종교, 김성진
Korean J. Met. Mater.
2023;61(9):633-641. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.633
Abstract
The objective of this study was to examine the wear-corrosion behavior of 18Mn(V, Mo) steel, which had a minor amount of Cr addition (< 3 wt%), in an artificial seawater environment, and compare it to conventional carbon steel. A variety of electrochemical experiments, including linear polarization resistance, impedance spectroscopy, and.....
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Web of Science 1
Crossref 2
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Korean J. Met. Mater.
2023;61(7):459-471. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.459
Abstract
The degree to which parameters affect the spheroidization heat treatment of steel was calculated by setting the spheroidization heat treatment conditions of Cr-Mo steel and using data analysis such as S/N ratio and ANOVA. After analyzing the transformation temperatures of the steel, A
c1
and A
c3
, using a DSC, the.....
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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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6K 초극저온 인장 시험 : Fe-Mn-Cr 강의 미세조직 및 기계적 물성
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김영균, 임가람, 나영상
Korean J. Met. Mater.
2023;61(6):389-396. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.389
Abstract
Materials with superior cryogenic strength and good ductility are increasingly in demand for resident friendly liquid-hydrogen (20K) storage tanks. Additionally, the space industry also requires materials that retain excellent mechanical properties at extremely low temperatures. However, mechanical testing at such low temperatures is highly limited due to the difficulties in.....
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기계학습을 이용한 색상형 미세조직의 결정립 크기 측정
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정준호, 김희수
Korean J. Met. Mater.
2023;61(5):379-387. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.379
Abstract
We constructed a convolutional neural network to estimate average grain size from microstructure images. In the previous study from our research group, the network was trained using GB-type images in which the grain matrix and grain boundary were represented in white and black, respectively. The model well estimated the same.....
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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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