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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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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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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 1
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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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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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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
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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 8
Crossref 10
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