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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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전기화학적 및 고압 수소 분위기하 템퍼드 마르텐사이트강의 수소취화 특성 비교
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김상규, 김재윤, 서현주, 정환교, 박재영, 백운봉, 황병철
Korean J. Met. Mater.
2023;61(11):807-814. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.807
Abstract
The effect of hydrogen charging methods on the hydrogen embrittlement characteristics of tempered martensitic steels were discussed in terms of hydrogen diffusion behavior. Two tempered martensitic steels with different Si content were fabricated by quenching and tempering. The steel with high Si content had a lower cementite fraction because the.....
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Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
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진인경, 이동근
Korean J. Met. Mater.
2023;61(10):741-747. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.741
Abstract
The addition of expensive elements to β titanium alloys, which are widely used in the aerospace and automobile industries, causes their price to increase. Low-cost, high-strength alloy (Ti-12.1Mo-1.0Fe) was designed in this study and the compressive behaviors of this alloy were evaluated for application to automobile parts, etc. As a.....
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카본나노튜브/Ecoflex 복합체로 제작된 고신축성 및 고감도 신축성 스트레인 센서
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황보유환, 남현진, 좌성훈
Korean J. Met. Mater.
2023;61(7):500-508. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.500
Abstract
Wearable strain sensors with high and broad sensitivity, high stretchability and excellent mechanical endurance will be widely useful in smart wearable electronics. In this work, we developed a stretchable strain sensor fabricated with a simple stencil printing technique. The stretchable strain sensor was fabricated using a multi-walled carbon nanotubes (MWCNTs)-Ecoflex.....
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Web of Science 4
Crossref 5
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장시간 열간노출에 따른 247LC 초내열합금 보수용접 열영향부의 액화균열민감도 변화
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정혜은, 서성문, 천은준
Korean J. Met. Mater.
2023;61(2):69-75. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.69
Abstract
In this study, the liquation cracking temperature range (LCTR) of over-aged 247LC superalloy repair welds was quantitatively evaluated using spot-Varestraint testing, especially for application in the repair weld heat-affected zone (HAZ). The metallurgical mechanism of the evaluated liquation cracking susceptibility and variation of the LCTRs of the over-aged 247LC superalloys.....
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Crossref 2
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금속 박막 두께가 크랙 기반 신축성 하이브리드 압저항 전극의 스트레인 감지 특성에 미치는 영향
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노지연, 김미래, 김종만
Korean J. Met. Mater.
2022;60(12):933-939. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.933
Abstract
In recent decades, many research efforts have been devoted to developing high-performance stretchable strain sensors due to their potential for application in various emerging wearable sensor systems. This work presents a facile yet highly efficient way of modulating the sensing performance of a thin metal film/conductive composite hybrid piezoresistor-based stretchable.....
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Crossref 1
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소부경화강의 변형 시효 및 수소취성 거동에 미치는 미세조직의 영향
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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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Web of Science 3
Crossref 3
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Pre-weld Varestraint 시험을 이용한 CM247LC 초내열합금 보수용접부 액화균열 민감도 평가
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정예선, 정진곤, 김세윤, 배성환, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater.
2022;60(4):272-281. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.272
Abstract
In this study, the liquation cracking susceptibility in the heat-affected zone of CM247LC superalloy gas turbine blades during repair welding was quantitatively evaluated using a newly developed pre-weld Varestraint test method. The repair welding geometry was replicated through Varestraint tests for the pre-weld bead. The liquation cracking susceptibility, that is,.....
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Web of Science 2
Crossref 5
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1.25Cr-0.5Mo과 2.25Cr-1Mo 강의 동적 변형시효 거동에 미치는 합금원소 및 미세조직의 영향
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이요섭, 이호중, 이종현
Korean J. Met. Mater.
2021;59(11):769-780. Published online 2021 Oct 28
DOI:
https://doi.org/10.3365/KJMM.2021.59.11.769
Abstract
The effect of alloying elements and microstructure on the dynamic strain aging (DSA) behavior of 1.25Cr-0.5Mo (P11, ASTM 335Gr.P11) and 2.25Cr-1Mo (P22, ASTM 335Gr.P22) steels was investigated. For both steels, different cooling conditions such as air-cooling (AC) and oil-quenching (OQ) were applied. Tensile tests were conducted in the temperature range.....
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Web of Science 2
Crossref 2
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ERNiFeCr-2 용가재 적용에 따른 CM247LC 초내열합금 용접부 응고균열 민감도 변화 거동
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김경민, 정혜은, 정예선, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater.
2021;59(10):698-708. Published online 2021 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.10.698
Abstract
The metallurgical aspects of weld solidification cracking in Ni-based superalloys (with Ti+Al > 5 mass%) have not been widely investigated thus far. Herein, the solidification cracking susceptibility of the CM247LC superalloy and its welds with ERNiFeCr-2 filler wire was quantitatively evaluated using a novel modified Varestraint testing method, for the.....
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Crossref 2
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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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Web of Science 1
Crossref 5
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Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr 지르코늄 합금 압연 판재의 동적 변형시효 거동
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김일현, 이명호, 정양일, 김현길, 장재일
Korean J. Met. Mater.
2021;59(1):8-13. Published online 2021 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.1.8
Abstract
The behavior of dynamic strain aging (DSA) in a Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr alloy strip was investigated at temperature ranges of 25–600 °C via a tensile test. The tensile test was performed at two different strain rates 8.33 × 10
-5
and 1.67 × 10
-2
s
-1
. The shear stress of the alloy strip revealed.....
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Web of Science 2
Crossref 2
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CM247LC 초내열합금 터빈 블레이드 용접 열영향부의 액화균열 발생 거동 및 민감도 평가
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정예선, 김경민, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater.
2020;58(12):875-886. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.875
Abstract
In this study, the weldability of the as-cast CM247LC superalloy for turbine blade applications was metallurgically evaluated in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc welding was performed at the tip.....
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Web of Science 7
Crossref 10
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페라이트-펄라이트 조직 저탄소강의 수소 취성에 미치는 Nb 첨가와 예비 변형의 영향
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고석우, 이지민, 황병철
Korean J. Met. Mater.
2020;58(11):752-758. Published online 2020 Oct 15
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.752
Abstract
The effect of pre-strain on the hydrogen embrittlement of Nb-free and Nb-added low-carbon steels with ferrite-pearlite structure was investigated in this study. After the steels were electrochemically charged with hydrogen, slow-strain rate tensile (SSRT) tests were conducted on them to examine hydrogen embrittlement behavior. The SSRT test results revealed that.....
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Web of Science 4
Crossref 4
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인코넬 FM52 및 308L 스테인리스강을 이용한 탄소강 이종 클래딩 및 공정변수에 따른 응고균열 발생 거동 변화: Transverse-Varestraint 시험을 이용한 응고취성 온도범위 평가
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김유경, 문병록, 강남현, 천은준
Korean J. Met. Mater.
2020;58(6):403-412. Published online 2020 May 14
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.403
Abstract
In this study, solidification cracking behavior and susceptibility in dissimilar cladding of Inconel alloy FM 52, 308L stainless steel to carbon steel, was investigated by submerged arc welding and transverse−Varestraint testing with gas tungsten arc welding. The effect of cladding conditions on cracking behavior and susceptibility was extensively evaluated, and.....
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Web of Science 6
Crossref 5
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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
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탄점소성 구성모델을 활용한 폴리우레탄 폼의 밀도 및 변형률 속도 의존 변형률 경화-연화 연성 재료 거동 규명
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김태림, 이치승
Korean J. Met. Mater.
2020;58(5):357-367. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.357
Abstract
Polyurethane foam (PUF) is one of the most well-known cellular materials and is widely employed in various industrial and biomedical fields thanks to its many advantages. These include mechanical and material characteristics such as low density and thermal conductivity, and high specific elastic modulus and strength. Despite of these advantages,.....
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Web of Science 4
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나노스케일 질화규소 멤브레인의 기계적, 열적 특성 분석
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장용주, 신현진, 위성주, 김하늘, 이기성, 안진호
Korean J. Met. Mater.
2019;57(2):124-129. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.124
Abstract
In micro/nano electro-mechanical system, silicon nitride (SiNx) membrane has been widely used in sensors, energy harvesting and optical filters because of its mechanical/chemical stability. However, it is necessary to verify mechanical and thermal properties of nanoscale SiNx membranes to ensure the desirable reliability and durability of a device because the.....
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Web of Science 5
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고강도 탄소강 FCA 용착금속의 고온균열 저항성과 저온 충격인성에 미치는 보론과 망간의 영향
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박수길, 조영호, 지춘호, 이정훈, 서성문, 강남현
Korean J. Met. Mater.
2019;57(1):28-37. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.28
Abstract
The hot crack resistance and mechanical properties of flux cored arc (FCA) welds were investigated with three kinds of welding consumables having different boron (B) and manganese (Mn) contents for high strength carbon steel. The hot crack resistance, measured from self-restraint testing, strongly depended on the amount of B in.....
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Web of Science 3
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유한요소해석을 이용한 AA1100의 다축 단조와 다축대각 단조의 비교
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정효태, 김민성, 권상철, 김순태, 이성, 최시훈
Korean J. Met. Mater.
2019;57(1):18-27. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.18
Abstract
The effect that forging routes (3 routes, A-C) exert on the development of deformation heterogeneity in AA1100 was theoretically performed using finite element analysis. Route A corresponded to a forging process that involved from 1 to 6 passes through multi-axial diagonal forging (MADF); Route B corresponded to a forging process.....
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Web of Science 4
Crossref 4
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신축성 금속 나노선 압저항 전극 기반 로젯 스트레인 센서
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김강현, 차재경, 김종만
Korean J. Met. Mater.
2018;56(11):835-843. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.835
Abstract
In this work, we report a delta rosette strain sensor based on highly stretchable silver nanowire (AgNW) percolation piezoresistors. The proposed rosette strain sensors were easily prepared by a facile twostep fabrication route. First, three identical AgNW piezoresistive electrodes were patterned in a simple and precise manner on a donor.....
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Crossref 1
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Korean J. Met. Mater.
2018;56(10):718-726. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.718
Abstract
In this work, we studied the formation of partially stabilized zirconia by a high energy ball milling (HEBM) approach. Zirconia powder was mixed with 8 mol% MgO and the powder mixture was milled for 10 hours. The structural and morphological evolutions of the powder particles were studied using X-ray diffraction.....
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Crossref 5
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자동차 구조용 열연강판의 고주기 피로 특성에 미치는 전변형 효과
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하동욱, 정창열
Korean J. Met. Mater.
2018;56(3):177-186. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.177
Abstract
The drive towards weight reduction in the automotive industry has led to the use of high strength steel sheets for structural applications. Pressing and stamping are important processes in automotive production and result in additional straining on the vehicle body and chassis sheet material. It is therefore important to have.....
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