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단결정 초내열합금에서 HIP 처리가 크리프 특성에 미치는 영향
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원영완, 구지호, 이재현
Korean J. Met. Mater.
2024;62(10):766-776. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.766
Abstract
The Rene N5 is a second-generation single crystal superalloy containing 3wt% Re, commonly used in gas turbine blades for power generation at temperatures up to 1600°C due to its excellent creep life. Generally, single crystal (SX) and directionally solidified (DS) blades are not applied to hot isostatic pressing (HIP) because.....
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IN792 초내열 합금의 고온 산화 거동에 미치는 결정립 크기의 영향
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방지예, 이동현, 이수열
Korean J. Met. Mater.
2024;62(4):267-274. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.267
Abstract
It is known that Ni-based superalloys possess superior mechanical properties in high-temperature and high-pressure environments. One of the drawbacks of these alloys is their tendency to oxidize at high temperatures. Improving their oxidation properties and obtaining a fundamental understanding of the underlying mechanism of their oxidation behavior are critical for.....
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Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
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송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater.
2024;62(1):32-38. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.32
Abstract
Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni
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Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While.....
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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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Crossref 1
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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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Web of Science 2
Crossref 2
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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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Web of Science 1
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IN 625 초내열합금의 응고거동 및 상변태 온도 분석
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함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현
Korean J. Met. Mater.
2023;61(4):261-268. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.261
Abstract
The solidification and phase transformation behaviors of IN625 with low C and Fe were investigated through directional solidification and quenching experiments. The primary and secondary dendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating good agreement with theoretical equations. The MC carbide formed at a constant temperature gradient.....
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Web of Science 3
Crossref 4
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레이저 급속 표면용융에 따른 일방향응고 247LC 초내열합금의 에피택셜 성장 및 응고균열 억제 방안
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김경민, 천은준
Korean J. Met. Mater.
2023;61(4):252-260. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.252
Abstract
In this study, the relationship between solidification cracking and epitaxial growth behavior with the high-speed laser surface melting of a directionally solidified 247LC superalloys was fundamentally and metallurgically investigated, to develop a successful welding procedure for the next generation of gas turbine blades. Under typical laser surface melting conditions (scan.....
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Web of Science 2
Crossref 3
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CAFE 모델을 사용한 니켈기 초내열합금 단결정 응고공정 해석
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정재준, 이형수, 윤대원, 정희원, 유영수, 서성문, 이재현
Korean J. Met. Mater.
2023;61(2):126-136. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.126
Abstract
The efficiency of gas turbines depends on the gas turbine working temperature. Single crystal blades are being applied more often than equiaxed blades in gas turbine engines, to increase the turbine inlet temperature, resulting in enhanced turbine engine efficiency. Single crystal blades endure creep conditions at high temperature better than.....
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Web of Science 3
Crossref 4
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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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Ni기 초내열 개발 합금(LESS)의 고온 인장특성에 미치는 결정립계 형상의 영향
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신용관, 강병일, 윤정일, 권용남, 김영직
Korean J. Met. Mater.
2022;60(12):940-949. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.940
Abstract
In order to investigate the mechanical properties of the developed wrought γ'-hardened Ni-based superalloy, LESS alloy (Low Eta Sigma Superalloy), and to understand the deformation behavior, tensile tests were carried out from room temperature to 800oC in comparison with IN 740H alloy. Like other superalloys, the tensile properties of the.....
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Web of Science 5
Crossref 6
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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 2
Crossref 3
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일방향응고한 GTD-111 초내열합금의 황 함량에 따른 미세조직 및 고온 기계적 특성
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강동수, 이형수, 윤대원, 정희원, 유영수, 서성문
Korean J. Met. Mater.
2022;60(10):782-792. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.782
Abstract
The influence of trace amounts of sulfur (S) on the microstructural evolution, tensile and creep properties in directionally solidified (DS) Ni-based superalloy GTD-111 were systematically investigated. Doping of S in the range of < 1 to 154 ppm resulted in the formation of a Ti
2
SC-type carbosulfide phase near the coarse.....
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Web of Science 2
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 3
Crossref 5
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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 2
Crossref 5
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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 9
Crossref 11
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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
Crossref 1
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분말 합금법 및 고온 압연 공정으로 제조된 대형 블록 Ni-Cr-Al 초합금 다공체의 기계적 특성 비대칭성
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김규식, 심민철, 박만호, 윤중열, 이기안
Korean J. Met. Mater.
2020;58(2):103-111. Published online 2020 Jan 8
DOI:
https://doi.org/10.3365/KJMM.2020.58.2.103
Abstract
A block Ni-Cr-Al superalloy foam with dimensions of 300 mm (width direction, WD) × 500 mm (rolling direction, RD) × 60 mm (normal direction, ND) was fabricated using powder alloying, multi-sheet stacking, and hot rolling processes. The structural characteristics, microstructure, and mechanical asymmetry of the block Ni-based foam were investigated......
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Seed를 이용한 단결정 초내열합금 CMSX-4에서 응고속도 및 열처리에 따른 미세조직 변화
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권순철, 신종호, 임근영, 성기태, 윤병관, 정의석, 이재현
Korean J. Met. Mater.
2018;56(10):745-754. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.745
Abstract
The CMSX-4 superalloy including refractory elements was directionally solidified using the seed of a [001] single crystal to control the growth direction to [001], where solidification velocity was changed from 25 to 160 μm/s. In the log-log plot between spacing and solidification velocity, the primary dendrite arm spacing and secondary.....
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Crossref 3
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CMSX-4 초내열합금에서 일방향 응고속도와 온도경사의 변화에 따른 1차 수지상 간격 예측
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신종호, 성창훈, 권순철, 권석환, 장병문, 이재현
Korean J. Met. Mater.
2018;56(9):674-679. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.674
Abstract
Directional solidification experiments were carried out to estimate the effect of solidification velocity and temperature gradient on primary dendrite arm spacing (PDAS) in the Ni-based superalloy, CMSX-4 alloy. The specimens were solidified at velocities of 1, 5, 25, 50 and 100 mm/s under given temperature gradients of 12.5, 18, 23.....
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Crossref 2
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니켈기 초내열합금의 열화에 따른 미세구조 및 저주기 피로손상도 평가
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허인강, 윤동현, 홍상현, 김진열, 김재훈, 장성호, 배시연
Korean J. Met. Mater.
2018;56(8):561-569. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.561
Abstract
Nickel-based superalloys have excellent resistance to extreme environments such as high temperature and high stress and are used as materials for large gas turbines. In this paper, specimens were taken from a blade that had been used for a long time, and their life span was studied by analysis of microstructure......
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Crossref 3
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니켈기 Inconel 740H 초내열합금과 고Cr계 Gr.92 내열강의 이종금속 용접부의 미세조직 및 크리프 파단 특성
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신경용, 이지원, 한정민, 이경운, 공병욱, 홍현욱
Korean J. Met. Mater.
2018;56(5):375-383. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.375
Abstract
Microstructure evolution and the creep fracture characteristics of dissimilar welds between Ni-based superalloy Inconel 740H and High Cr ferritic steel Gr.92 were investigated. The dissimilar welds were fabricated by shielded metal arc (SMA) welding process with Ni-based austenitic Inconel 182 superalloy. Postweld heat treatment at 760
o
C for 4 hours.....
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Crossref 6
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니켈기 초내열합금의 감마프라임상의 성장거동
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오준협, 조대영, 김홍규, 윤존도
Korean J. Met. Mater.
2018;56(1):8-13. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.8
Abstract
The mechanical properties of nickel-base superalloys used in disk and blade materials for gas turbine engines can be maximized by controlling their microstructure, such as the size of precipitates. In this study, we investigated the size of gamma prime precipitates after age hardening heat treatment at 650-980 oC for 1-48.....
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Crossref 2
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Alloy 738 초내열합금 4 mm 두께 각관의 정밀주조 시 수축공 및 수축변위 해석 및 분석
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박명일, 김경민, 이영철, 이정석, 이재현, 유재현, 박상후, 최윤석
Korean J. Met. Mater.
2017;55(2):132-138. Published online 2017 Feb 2
DOI:
https://doi.org/10.3365/KJMM.2017.55.2.132
Abstract
Investment casting for the thin (4 mm thick) rectangular tube (40 mm wide, 80 mm high and 200 mm long) was carried out numerically and experimentally for Alloy 738, which is a precipitation-hardened Ni-base superalloy. Two types of rectangular tubes, one with a regular array (10 mm by 10 mm.....
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CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
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이정석, 권석환, 윤병관, 장병문, 정연길, 이재현
Korean J. Met. Mater.
2016;54(11):838-845. Published online 2016 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.11.838
Abstract
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS.....
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Crossref 4
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SUH660합금의 미세조직 및 기계적 특성에 미치는 2차 시효 열처리의 영향
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김도훈, 이유환, 김정한
Korean J. Met. Mater.
2016;54(10):716-722. Published online 2016 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2016.54.10.716
Abstract
nSUH660 is a precipitation hardening stainless steel which has high strength at moderately high temperature. In this study, the effect of a secondary aging-treatment after the standard 720 °C heat-treatment was investigated. The Rockwell C hardness test with detailed TEM observerations was performed to study the steel’s hardening mechanism. The.....
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Crossref 3
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