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Korean J. Met. Mater.
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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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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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UNS N07718의 묽은 사워(sour) 모사 용액 내 국부 부식 거동
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이예진, 이준섭, 권순일, 신정호, 조영태, 김석, 이재현
Korean J. Met. Mater.
2023;61(8):553-560. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.553
Abstract
The localized corrosion behavior of precipitation-hardened UNS N07718 was investigated by immersion tests in 6 wt% FeCl
3
+ 1.0 wt% HCl and the use of electrochemical techniques in a simulating solution of a diluted-sour environment of 25 wt% NaCl + 0.5 wt% CH
3
COOH. The Ti carbides and Nb-Mo carbides with.....
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Web of Science 1
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증기발생기 전열관용 Alloy 690 소재의 크리프 특성에 미치는 탄화물 형성의 영향
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김형규, 홍석민, 김종민, 김민철, 이영국
Korean J. Met. Mater.
2023;61(4):301-309. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.301
Abstract
The creep properties of Alloy 690, used as a steam generator tube material in nuclear power plants, were evaluated at 650°C, 750°C, and 850°C. The parameters of creep life prediction models were derived using the Larson-Miller (LM), Manson-Haferd (MH), and Orr-Sherby-Dorn (OSD) models, to use as mechanical properties under a.....
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Korean J. Met. Mater.
2023;61(3):157-169. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.157
Abstract
Carbon-based thin film tool coatings, such as diamond-like carbon (DLC), have excellent lowfriction and anti-sticking properties. These thin films are widely used for the cutting and machining of increasingly widely-used lightweight non-metallic and non-ferrous metal materials, as a part of countermeasures against global warming. However, non-metallic and non-ferrous metal materials.....
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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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Web of Science 1
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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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Web of Science 1
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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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Web of Science 2
Crossref 3
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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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급속소결에 의한 WC-Graphene-Al 복합재료 제조 및 기계적 성질
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손인진
Korean J. Met. Mater.
2021;59(6):384-391. Published online 2021 May 26
DOI:
https://doi.org/10.3365/KJMM.2021.59.6.384
Abstract
Tungsten carbides are very attractive because of their superior properties, e.g., high thermal and electrical conductivities, high melting point, high hardness, and relatively high chemical stability. Tungsten carbides with a binder metal, for example Ni or Co, are mainly used to fabricate nozzles, molds and cutting tools in the composite.....
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Web of Science 1
Crossref 1
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WC-12~22wt%Co 초경합금에서 미세조직 인자가 인장 성질에 미치는 영향
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류성현, 김경일, 노우람, 김상섭, 조규섭
Korean J. Met. Mater.
2021;59(3):201-208. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.201
Abstract
Cemented carbide is a kind of composite material in which fine particles of carbide are embedded into the matrix of a binder metal. It has a long service life because of its superior mechanical properties. In this study, the overall tensile behavior of a cemented carbide, WC-Co, was investigated by.....
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Web of Science 3
Crossref 3
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오스테나이트계 경량철강의 냉각 조건에 따른 미세조직, 기계적 특성 이해 및 대형 슬라브 내부 특성 분포 예측 연구
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김태하, 최윤석, 김경원, 박성준, 박준영, 정경재, 한흥남, 신종호
Korean J. Met. Mater.
2020;58(12):830-842. Published online 2020 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2020.58.12.830
Abstract
The effects of the cooling rate, after solution heat treatment, on the microstructures and mechanical properties of Fe-22Mn-8Al-0.8C-0.02Nb (low carbon) and Fe-20Mn-8Al-1.1C-0.1Nb (high carbon) light-weight steels were systematically investigated. The cooling process was controlled to achieve six different cooling rates, ranging from -0.016 to -465.1
o
C/s. Under the slowest cooling.....
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Web of Science 3
Crossref 2
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AISI 4115 강의 진공 침탄 시 아세틸렌 유량에 따른 침탄 거동
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권기훈, 문경일, 이영국, 정민수
Korean J. Met. Mater.
2020;58(9):617-625. Published online 2020 Aug 13
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.617
Abstract
The vacuum carburizing behavior of AISI 4115 steel according to acetylene flow rates (1, 5, 10, 20, 30, 40, and 50 sccm) and temperatures (900, 950, and 1000
o
C) was quantitatively investigated through microstructure, carbon concentration and hardness analyses. As the acetylene flow rate increased, the penetration rate of carbon.....
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온도 제어형 레이저 열처리에 따른 NiCrBSi 및 CoCrWC 용사 코팅층의 나노구조 형성 거동
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천은준
Korean J. Met. Mater.
2020;58(4):247-256. Published online 2020 Mar 10
DOI:
https://doi.org/10.3365/KJMM.2020.58.4.247
Abstract
.For surface hardening of a continuous casting mold component, a thermal spray coating of NiCrBSi (Metco-16C) and CoCrWC (Stellite-1) was performed followed by laser heat treatment of the coatings. To support selective modification of the thermal spray coating, a metallurgically determined surface temperature was maintained during the laser heat treatment,.....
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Web of Science 4
Crossref 5
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단일 크기와 이중 크기의 탄화규소 입자를 이용한 액상소결 탄화규소의 기계적 특성
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이준엽, 이상필, 이진경, 이문희, 황승국
Korean J. Met. Mater.
2019;57(1):60-66. Published online 2018 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2019.57.1.60
Abstract
Both the mechanical properties and probability distribution of liquid phase sintered SiC (LPS-SiC) materials were investigated, based on a detailed analysis of their microstructures. In particular, the effect of the starting sizes of SiC particles on the characterization of LPS-SiC materials was evaluated. LPS-SiC materials were fabricated with a constant.....
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Web of Science 2
Crossref 2
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핫스탬핑용 30MnB5강의 템퍼링 조건에 따른 미세조직 및 기계적 물성 연구
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정준영, 박상천, 신가영, 이창욱, 김태정, 최민수
Korean J. Met. Mater.
2018;56(11):787-795. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.787
Abstract
The effects of tempering condition on the microstructure and mechanical properties of 30MnB5 hot stamping steel were investigated in this study. Before the tempering, hot-stamped 30MnB5 steel was composed of only α′-martensite microstructure without precipitates. After the tempering at 180 ℃ for 120 min, nano-sized ε-carbides were precipitated in the.....
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Crossref 9
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탄소함량이 자동차용 초고강도 철강소재의 부식 및 수소 확산 거동에 미치는 영향
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황은혜, 성환구, 김성진
Korean J. Met. Mater.
2018;56(8):570-579. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.570
Abstract
Recently developed ultra-strong GIGA STEEL exhibites superior mechanical properties, with a high tensile strength of more than 1.5 GPa and good impact toughness. Nevertheless, its application to auto parts has been severely restricted, mainly due to a substantial reduction in the resistance to hydrogen embrittlement (HE) induced by aqueous corrosion......
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Crossref 14
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CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
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고준영, 송재숙, 홍순익
Korean J. Met. Mater.
2018;56(1):26-33. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.26
Abstract
The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at.....
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Crossref 5
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베이나이트계 X70강 수소가압분위기 인장시험의 수소취성균열 전파
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최병학, 장현수, 이범규, 김의수, 김우식, 백운봉, 남승훈
Korean J. Met. Mater.
2018;56(1):1-7. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.1
Abstract
This study investigated hydrogen induced cracking (HIC) of X70 steel, used for gas pipeline material, with a bainitic microstructure. The effect of hydrogen on the steel was investigated by tensiletesting in a high pressure hydrogen atmosphere, using OM, SEM and TEM analyses. The mechanisms of hydrogen-related cracking were represented as.....
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Crossref 6
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Fe-Mn-Al-C계 경량철강의 미세조직 및 기계적 물성 변화에 미치는 냉각속도의 영향
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박준영, 박성준, 이재현, 문준오, 이태호, 정경재, 한흥남, 신종호
Korean J. Met. Mater.
2017;55(12):825-835. Published online 2017 Dec 4
DOI:
https://doi.org/10.3365/KJMM.2017.55.12.825
Abstract
The effects of cooling after solution heat treatment on the microstructure and mechanical properties of light-weight steels were investigated using Fe
-
30Mn
-
xAl
-
0.9C alloys containing 9.0–12.8 wt% Al. Lab
-
scale specimens (thickness: 10 mm) of the alloys were cooled by different cooling rates from -337 to -0.053 ℃/s using water, air, and furnace.....
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Crossref 1
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고엔트로피 합금강의 시효경화 및 재결정 연화현상
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최병학, 장현수, 김형섭, 문종언
Korean J. Met. Mater.
2017;55(10):684-688. Published online 2017 Sep 28
DOI:
https://doi.org/10.3365/KJMM.2017.55.10.684
Abstract
Age hardening and re-crystallization softening of a type of high entropy alloy, CoCrFeMnNi, was performed to investigate the relationship between microstructure and the property of mechanical hardness. Equiatomic CoCrFeMnNi was produced by casting followed by homogenizing, cold rolling and post heat treatments. TEM analysis revealed that the microstructure of the.....
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22Cr-9Mo-3Fe-4Nb 니켈기 초내열합금의 저주기 피로에 따른 미세조직변화
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송영석, 석진익, 강정윤
Korean J. Met. Mater.
2017;55(9):609-614. Published online 2017 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2017.55.9.609
Abstract
A new Ni based superalloy with high fatigue resistance and fine grain was considered as a material for high-pressure buckets in fossil fuel power plants. Since such buckets are usually exposed to extreme operating conditions, low cycle fatigue tests were conducted to understand the microstructure evolution of the material during.....
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WC/Co 초경 스크랩 산화물의 환원/침탄 반응
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권철민, 이길근, 하국현
Korean J. Met. Mater.
2016;54(10):743-751. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.743
Abstract
This study conducted an analysis of the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon under an argon and hydrogen gas atmosphere. The WC/Co hardmetal scrap oxide consisted of WO
3
and CoWO
4
. WO
3
was reduced before CoWO
4
by the solid carbon regardless of gas atmosphere. The simple oxide.....
More
Crossref 3
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