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원전 내부구조물 오스테나이트 스테인리스강 용접부의 열시효 거동 및 열취화 활성화에너지 분석
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김유진, 김지수, 서주원, 김종민, 이수열, 홍석민
Korean J. Met. Mater.
2025;63(5):330-343. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.330
Abstract
This study examines the thermal aging behavior and associated changes in mechanical properties of austenitic stainless steel welds (ASSW) used within reactor vessel internals (RVI). ASSW specimens were fabricated employing the Gas Tungsten Arc Welding (GTAW) technique, adhering to the welding procedure specifications for RVI, and were thermally aged at.....
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Korean J. Met. Mater.
2025;63(3):231-241. Published online 2025 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.3.231
Abstract
Numerous studies on machine learning-based creep life prediction using the creep data collected from various existing experimental data have been reported. Since the prediction of creep life is heavily influenced by the quality and integrity of the collected creep data, data preprocessing is required to eliminate physically inconsistent creep datapoints,.....
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Korean J. Met. Mater.
2025;63(3):203-209. Published online 2025 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.3.203
Abstract
Organic ferroelectric field-effect transistors (Fe-FETs) are highly attractive for memory device applications because of their ability to read data without causing damage (nondestructive readout) and their excellent retention capabilities. These attributes make organic Fe-FETs an appealing alternative to their inorganic counterparts, which, while demonstrating superior memory performance for practical applications,.....
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Nb-Ni-Ti 합금의 치유 과정을 이용한 마르텐사이트 변태 및 기계적 특성의 향상
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김참일, 박은수, 김도향
Korean J. Met. Mater.
2025;63(3):177-185. Published online 2025 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.3.177
Abstract
The aim of the present study is to enhance the stress recovery capability of the β Nb phase in NbNi-Ti alloy by using the shape memory effect (SME) of the NiTi phase. The concept of healing treatment to recover the mechanical property has been newly introduced for Nb-Ni-Ti alloy. Nb-29.2at%Ni-40.8at%Ti.....
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수정 용접 횟수에 따른 HY100강 용접 열영향부의 기계적 성질과 미세조직 거동
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김도섭, 최정현, 최동현, 문병록, 박수길, 강남현
Korean J. Met. Mater.
2025;63(2):121-131. Published online 2025 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.2.121
Abstract
The mechanical properties and microstructural behaviors of multiple–repaired welds were investigated in the heat affected zone (HAZ) of HY100 steels. Test coupons were prepared from flux cored arc welds at the same location of weldments that had been repaired one, three and five times. The multiple–repaired welding caused continuous high.....
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Korean J. Met. Mater.
2025;63(1):43-52. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.43
Abstract
Bismuth antimony telluride (Bi-Sb-Te)-based alloys remain the dominant choice for near-roomtemperature thermoelectric cooling applications. One of the most studied approaches to improve the thermoelectric performance of Bi-Sb-Te alloys has been a nanostructuring strategy, to suppress the lattice thermal conductivity. This study investigates the impact of incorporating reduced pyrolyzed Pd acetate.....
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생체용 Ti-(14-22)Zr-6Nb-2Mo-2Sn(at.%) 합금의 형상기억특성
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박준혁, 김재일
Korean J. Met. Mater.
2024;62(12):989-995. Published online 2024 Nov 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.989
Abstract
Since the recently reported biotoxicity of Ni, the use of Ti-Ni base shape memory alloys as biomaterial has been reduced. For this reason, Ti–Nb base superelastic alloys consisting of only non-toxic elements are being actively studied for potential use as biomaterials. In this study, the effects of Zr content and.....
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Web of Science 1
Crossref 1
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상전이 및 점 결함에 의한 Fe
1-
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Co
x
Se
2
합금의 열전특성 향상
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박현진, 김준수, 김세준, 서원선, 김현식, 김상일
Korean J. Met. Mater.
2024;62(12):972-980. Published online 2024 Nov 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.972
Abstract
This study investigates the thermoelectric properties of Fe
1-
x
Co
x
Se
2
(
x
= 0, 0.25, 0.5, 0.75, and 1) alloys using theoretical modeling approaches. The Single Parabolic Band (SPB) model was employed to calculate band parameters such as density-of-states effective mass (
m
d
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μ
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), weighted mobility (
μ
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중탄소강의 페라이트-펄라이트 미세조직과 항복강도에 미치는 Si 첨가의 영향
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고재현, 김경원, 장재훈, 이기영, 박현, 김정한, 이정원, 김용현, 홍성민, 강전연, 최윤석
Korean J. Met. Mater.
2024;62(11):897-910. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.897
Abstract
To enhance the intrinsic yield strength of the ferrite-pearlite microstructure that inevitably forms in a non-quenched-and-tempered steel for large structural components, this study analyzed the effect of adding Si. The resulting ferrite-pearlite microstructure in medium-carbon steels was examined, and the resulting increase in yield strength was interpreted based on strengthening.....
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Korean J. Met. Mater.
2024;62(11):868-878. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.868
Abstract
In this study, the electromagnetic (EM) wave absorption properties of a two-layered structure composed of La
0.7
Sr
0.3
MnO
3
-epoxy (10 wt.%) (LSMO) and SrFe
9.5
Co
1.25
Ti
1.25
O
19
-epoxy (10 wt.%) (SFCTO), both exhibiting distinct high-frequency magnetic and dielectric properties, were investigated using a High Frequency Simulation Software (HFSS) simulation tool. LSMO had a high dielectric constant (ε'.....
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박막의 전기적, 광학적, 열적 특성 및 전자파 차폐효과 연구
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김지호, 김유성, 최진영, 이연학, 공영민, 김대일
Korean J. Met. Mater.
2024;62(9):735-739. Published online 2024 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.9.735
Abstract
Transparent TiO
2
single layer and TiO
2
/Ag/TiO
2
(TAT) tri-layer films were deposited by DC and RF magnetron sputter on a polyimide substrate at room temperature. During the TAT deposition, the thickness of the TiO
2
layer was kept at 20 nm, while the Ag interlayer was varied as 10, 15, 20 nm to.....
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Web of Science 1
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M
2+, 3+
(M = Mn
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, Zn
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, Ni
2+
)이 치환된 Sr
3
Co
2
Fe
24
O
41
hexaferrite 복합체의 전자기파 흡수 특성
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허재희, 강영민
Korean J. Met. Mater.
2024;62(8):645-655. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.645
Abstract
Mn, Zn, Ni-substituted Z-type hexaferrites, Sr
3
Co
2
Fe
24
O
41
(Sr
3
Co
2
Fe
24-x
Mn
x
O
41
, Sr
3
Co
2-y
Zn
y
Fe
24
O
41
, Sr
3
Co
1-z
Ni
z
ZnFe
24
O
41
), were prepared by sol-gel synthesis processes and their high-frequency magnetic, dielectric and electromagnetic (EM) wave absorption characteristics were investigated. Substituting Mn for Fe by
x
= 0.5 maintained the single-phase Z phase while shifting the μ' , μ″ spectra towards lower.....
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Twin wire arc spray 공정을 통해 제작된 Fe계 비정질 합금 코팅의 염수 환경 노출에 대한 연구
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권한솔, 강용진, 유연우, 김도현, 박영진, 남욱희, 변응선
Korean J. Met. Mater.
2024;62(8):613-623. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.613
Abstract
Fe-based amorphous alloys are promising structural materials that have a disordered lattice structure and metastable state. Due to their advanced properties, including high hardness, high elastic limit, improved wear and corrosion resistance, Fe-based amorphous alloys have a great potential for protective materials in harsh industrial fields. Twin wire arc spray.....
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Cu 도핑 및 Electric Current Pulse 공정에 의한 Bi-Sb-Te계 열전소재의 최대 열전성능지수 예측
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이준하, 박현진, 김준수, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(7):550-557. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.550
Abstract
Bi
2
Te
3
shows high thermoelectric performance near room temperature, making it the most widely used material in thermoelectric cooling applications. Cu doping has been found to be effective in improving the thermoelectric performance of Bi
2
Te
3
. However, due to the problem of easy migration of Cu ions, the stability of Cu-doped Bi
2
Te
3
.....
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시작물질 농도 제어에 따른 Cu
3
SbSe
4
열전소재의 최대 열전성능지수 예측
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이민규, 황성미, 김세준, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(6):487-493. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.487
Abstract
Cu
3
SbSe
4
is considered a promising thermoelectric material because of its large effective mass and low thermal conductivity, originating from its unique lattice structure. However, Cu
3
SbSe
4
has intrinsically low carrier concentration and relatively high electric resistance which limit performance. Recently, a
zT
improvement in Cu
3
SbSe
4
was reported where doping/precipitation is controlled.....
More
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Korean J. Met. Mater.
2024;62(6):455-463. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.455
Abstract
This research explores how aggregation influences the electrical behavior at both the planar - heterojunction poly(3-hexylthiophene) (P3HT)/SiO2 and P3HT/ZnO nanocrystal (NC) interfaces. The formation of H- and J-type aggregates leads to distinct molecular ordering and packing structures, manifesting as changes in threshold voltage shifts (electrical gating) as well as absorption.....
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냉간 압연 시 Ta-10W 합금의 미세조직 변화 및 슬립 거동에 미치는 압하율의 영향
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박기성, Lalit Kaushik, 유효상, 전재열, 최시훈
Korean J. Met. Mater.
2024;62(6):429-444. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.429
Abstract
In this study, we investigated the influence of cold rolling reduction on microstructural evolution and slip behavior in Ta-10W alloy fabricated by vacuum arc melting (VAM). As the reduction increased, both single and multiple slips were observed within some grain interiors. At reductions of 20% and 40%, deformation bands, primarily.....
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Web of Science 1
Crossref 1
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단면 분석용 시편 제작을 위한 펨토초 레이저 가공에서 입사각이 테이퍼 각도에 미치는 영향
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김재경, 김충수, 박석희, 하정홍
Korean J. Met. Mater.
2024;62(6):419-428. Published online 2024 May 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.6.419
Abstract
Focused ion beam (FIB) technology is one of the most widely used methods for fabricating crosssectional analysis specimens because of its high precision and characteristics that minimize the occurrence of defects. Demand for large cross-sectional area analysis is increasing to improve product reliability in various industries, but is limited by.....
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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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Korean J. Met. Mater.
2024;62(5):377-384. Published online 2024 May 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.5.377
Abstract
This study explores Mg-composition dependent cycle stability in a Zn
1-x
Mg
x
O Li-ion battery, where battery cycles transition from an electronic transport-limited to an ionic transport limited regime. We investigated the impact of Mg doping in Zn
1-x
Mg
x
O nanocrystals on Li-ion battery performance, focusing on Mg compositions between x=0.05 and x=0.15. Mg composition.....
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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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Web of Science 1
Crossref 1
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Ti-Ni-Fe 합금의 R상 변태온도에 미치는 Fe 조성과 열처리 온도의 영향
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김원석, 금나영, 김진용, 김재일
Korean J. Met. Mater.
2024;62(4):251-256. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.251
Abstract
R-phase transformations in TiNi shape memory alloys (Nitinol) have various applications because of their small thermal hysteresis and low fatigue resistance. Adding a third element such as Fe or Al is one of the useful ways to induce R-phase transformation. Controlling the R-phase transformation temperature is crucial for industrial and...
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Web of Science 3
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고에너지 볼 밀링을 이용한 분산강화된 Fe-TaC 합금분말의 소결거동 및 기계적 특성평가
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박범순, 이정한, 박재철, 홍성길, 박현국
Korean J. Met. Mater.
2024;62(3):163-170. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.163
Abstract
In this study, a high-melting point element, tantalum carbide (TaC) was added to improve the mechanical properties and the oxidation/corrosion resistance of Fe. The Fe-TaC composites were synthesized by high energy ball milling for the mechanical alloying of the non-equilibrium phase (Fe-Ta) and the homogeneous dispersion of TaC. Fe-TaC composite.....
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Web of Science 3
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Ti-xMo-2Fe 베타계 타이타늄 합금의 기계적 특성 및 부식 특성에 미치는 Mo의 영향 평가
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박정연, 이재관, 이용재, 이동근
Korean J. Met. Mater.
2024;62(2):125-131. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.125
Abstract
Titanium alloys are currently used in offshore industries. The titanium alloys used in offshore plants need to have excellent corrosion resistance and mechanical properties because offshore plants are exposed to harsh corrosive environments. At this time, the Ti-6Al-4V ELI alloy is mainly used in offshore plants because it has excellent.....
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Web of Science 1
Crossref 1
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Korean J. Met. Mater.
2024;62(2):106-114. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.106
Abstract
This research elucidates the intricate interplay of lithium content, oxygen pressure, and temperature and their influence on the electrical properties of Lithium-doped zinc oxide (LZO). The electrical behavior of zinc oxide (ZnO), a prominent semiconductor material, can be modulated when doped with lithium (Li). Through systematic experimentation, we demonstrate that.....
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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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Bi 도핑에 따른 SnTe의 상온 최대 열전성능지수 예측
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이준하, 박현진, 김정연, 서원선, 양희선, Umut Aydemir, 김세윤, 신원호, 김현식
Korean J. Met. Mater.
2023;61(12):915-922. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.915
Abstract
SnTe has drawn much attention due to its Pb-free composition along with tunable electronic and lattice structures. However, its intrinsically high defect concentration and high lattice thermal conductivity (
κ
1
) have hindered its application in devices. Recently, Bi doping at Sn-sites in Sn
1-
x
Bi
x
Te (
x
= 0.0 – 0.08) has been demonstrated.....
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Web of Science 3
Crossref 2
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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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Web of Science 1
Crossref 1
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Fe계 합금 용가재가 적용된 9% Ni강 용접 조인트의 미세조직과 기계적 특성에 미치는 용접 후 열처리의 영향
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최광수, 정효연
Korean J. Met. Mater.
2023;61(9):669-678. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.669
Abstract
A Fe-based filler material with the composition of Fe-20Ni-5Co-2.5Mn-0.2C was used for welding 9% Ni steel, and the effect of post-weld heat treatment on the microstructure and mechanical properties of the welded joints was investigated. Post-weld heat treatment of the welded joint was performed in the temperature range of 200.....
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Web of Science 1
Crossref 1
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개질된 COG (coke oven gas)를 이용한 2단 DRI (direct reduced iron) 공정의 공정변수 결정
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고민정, 김수영, 조종오, 이재랑, 김용하, 원용선
Korean J. Met. Mater.
2023;61(8):573-580. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.573
Abstract
On the road to carbon neutrality, a great deal of attention is being paid to emerging technologies such as the DRI (direct reduced iron) process. This study proposes a two-stage DRI process using reformed COG (coke oven gas), and determined optimal process parameters. The reduction and carbonization of Carajás iron.....
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