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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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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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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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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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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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Korean J. Met. Mater.
2023;61(5):330-337. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.330
Abstract
The effect of TiO
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additive concentration and sintering temperatures on the densification of alumina (Al
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) ceramics were investigated. Densified alumina specimens were prepared by uniaxial pressing at a pressure of 60 MPa followed by isothermal heating at either 1400, 1500, or 1600 o C for 2 h. The relative.....
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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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분말 사출 성형된 Fe-Cr-B/316L 스테인레스강 복합재료의 미세조직과 기계적 특성에 미치는 Fe-Cr-B의 영향
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김영균, 주연아, 윤태식, 이기안
Korean J. Met. Mater.
2023;61(1):9-17. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.9
Abstract
Stainless steel-based composites (SMCs) mixed with 316L stainless steel powder and Fe-Cr-B based M alloys powder ed M) powder were manufactured using the powder injection molding (PIM) process, and their microstructure and mechanical properties were investigated. To examine the effect of M content on the properties of SMCs, the M.....
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고압비틀림 공정 처리된 Al7068 합금의 기계적 특성 및 미세조직 변화
J
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오주희, 손수정, 김형섭, 설재복, 성효경, 김정기
Korean J. Met. Mater.
2023;61(1):1-8. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.1
Abstract
The combination of severe plastic deformation, deformational heat, and frictional heat generated during the high-pressure torsion process has a great effect on microstructural evolutions, including grain refinement, dynamic recrystallization and recovery. In particular, the low melting temperature metallic alloys (e.g., aluminum and magnesium) also induce nano-precipitations in the matrix during.....
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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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Cited By 2
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소부경화강의 변형 시효 및 수소취성 거동에 미치는 미세조직의 영향
J
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김재윤, 고석우, 황병철
Korean J. Met. Mater.
2022;60(11):811-818. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.811
Abstract
The strain aging and hydrogen embrittlement behavior of two bake hardening (BH) steels with different microstructures were investigated in this study. The single-phase BH steel was composed of fully ferrite, while the dual-phase BH steel consisted of ferrite and 3 % martensite. The BH index and aging index (AI) of.....
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Cited By 1
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슬래그의 미세구조 및 화학분석을 통한 6-7세기 한국의 청동 야금 기술 연구
S
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D
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K
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김소진, 한우림, 문동혁, 이나라, 김영도
Korean J. Met. Mater.
2022;60(10):774-781. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.774
Abstract
Metallurgical remains such as crucible, mould, slag and tuyere are generated in the production of bronze. The analysis of slag in particular can be used to identify the raw materials, processes and environments (temperature and condition) employed in the bronze fabrication . The Gwanbuk-ri site in Buyeo is known as.....
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Cited By 1
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다성분계 Al-Si-Cu-Ni 합금의 미세조직적 인자와 고온강도의 상관관계에 대한 연구
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조민수, 조영희, 이정무, 김수배, 김수현, 장재일
Korean J. Met. Mater.
2022;60(7):489-501. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.489
Abstract
The elevated temperature strength of multicomponent Al-Si alloys is greatly affected by the volume fraction and the interconnectivity of hard phases formed upon solidification. In the present investigation, such influences were examined for two Al-Si-Cu-Ni alloys with different total volume fractions of hard phases. To control the microstructural features related.....
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Cited By 1
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Korean J. Met. Mater.
2022;60(6):471-477. Published online 2022 May 24
DOI:
https://doi.org/10.3365/KJMM.2022.60.6.471
Abstract
Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,.....
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Cited By 4
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Al 5052-H32 합금의 저항 점 용접 시 가압력 제어 방식에 따른 미세조직 및 용접특성 비교
W
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J
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김원호, 김재훈, 전현욱, 김재원, 이은경, 지창욱
Korean J. Met. Mater.
2022;60(5):350-359. Published online 2022 Apr 22
DOI:
https://doi.org/10.3365/KJMM.2022.60.5.350
Abstract
Recently, lightweight vehicle bodies are in increasing demand to satisfy exhaust gas and environmental regulations around the world. In particular, aluminum alloys are widely used to manufacture lightweight parts, because of their excellent properties including corrosion resistance and mechanical properties. After the forming process, the welding process is important for.....
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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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Ni-Cr-Mo-V계 저합금강의 미세조직과 기계적 특성에 관한 연구
M
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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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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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Cited By 1
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초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
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강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater.
2022;60(3):169-179. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.169
Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive.....
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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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Cited By 1
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기계학습에 의한 Al-Si 주조 합금 미세조직 이미지 생성
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황인규, 이현지, 정상준, 조인성, 김희수
Korean J. Met. Mater.
2021;59(11):838-847. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.838
Abstract
In this study, we constructed a deep convolutional generative adversarial network (DCGAN) to generate the microstructural images that imitate the real microstructures of binary Al-Si cast alloys. We prepared four combinations of alloys, Al-6wt%Si, Al-9wt%Si, Al-12wt%Si and Al-15wt%Si for machine learning. DCGAN is composed of a generator and a discriminator......
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Cited By 2
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Al과 SnO
2
혼합 분말을 사용한 일차원 Al과 Al
2
O
3
나노/마이크로구조의 저온 성장
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이근형
Korean J. Met. Mater.
2021;59(9):677-681. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.677
Abstract
One-dimensional Al and Al
2
O
3
nano/microstructures were fabricated via thermal oxidation of Al and SnO
2
powder mixtures at temperatures below the melting point of Al (660 oC). Furthermore, the synthesis process was carried out in air at atmospheric pressure, which made the process very simple and easy. Sn metal particles with.....
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Cited By 1
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(K
0.5
Na
0.5
)NbO
3
-SrTiO
3
계에서 결정구조 및 미세구조 제어를 통한 유전특성 향상
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이성은, 권준형, 문경석
Korean J. Met. Mater.
2021;59(7):499-504. Published online 2021 Jun 16
DOI:
https://doi.org/10.3365/KJMM.2021.59.7.499
Abstract
Solid solutions and composites of a mixture of (K
0.5
Na
0.5
)NbO
3
(KNN) and SrTiO
3
(ST) were respectively synthesized by different process routes using a conventional solid state reaction. All starting materials were mixed simultaneously and calcined at 800
o
C for 4 h to obtain the solid solutions of KNN-ST. Meanwhile, the composites.....
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가시화 기반 Varestraint 시험을 이용한 CM247LC 초내열합금 용접 열영향부의 액화균열 민감도 평가 및 제어
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정예선, 김경민, 이형수, 서성문, 천은준
Korean J. Met. Mater.
2021;59(7):445-458. Published online 2021 Jun 11
DOI:
https://doi.org/10.3365/KJMM.2021.59.7.445
Abstract
The metallurgical aspects of weld cracking in Ni-based superalloys remain relatively unexplored in existing research. The present study performed comprehensive metallurgical and manufactural investigations into the weldability of an Ni-based superalloy, CM247LC, from the viewpoint of the liquation cracking behavior and its susceptibility. Metallurgical solutions to suppress the liquation-cracking susceptibility.....
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Cited By 3
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주철 미세조직 분석을 위한 합성곱 신경망에서의 중간층 시각화
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이현지, 황인규, 정상준, 조인성, 김희수
Korean J. Met. Mater.
2021;59(6):430-438. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.430
Abstract
We attempted to classify the microstructural images of spheroidal graphite cast iron and grey cast iron using a convolutional neural network (CNN) model. The CNN comprised four combinations of convolution and pooling layers followed by two fully-connected layers. Numerous microscopic images of each cast iron were prepared to train and.....
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Cited By 4
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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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Cited By 1
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Korean J. Met. Mater.
2021;59(6):357-364. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.357
Abstract
W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated.....
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Cited By 3
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