지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.10
- 수록면
- 26 - 30 (5page)
이용수
초록· 키워드
오류제보하기
Hastelloy X in this study was applied in jet engine F-15 air fighter as shroud to isolate the engine from outer skin. After 15 years operation at elevated temperature the mechanical properties decreased gradually due to the precipitation of continues second phases in the grain boundaries and precipitated inside the grain. The crack happened at the edge of the shroud due to the thermal and mechanical stress from jet engine. Selective TEM analysis found that the grain boundaries consist of M<SUB>23</SUB>C₆ carbide, M₆ Ccarbide and small percentage of sigma(σ) phase. Furthermore, it was confirmed the nano size of σ and miu (μ) phase inside the grain.
In this study, it was investigated the microstructure of the degraded shroud component and HAZ of repair welded shroud. In the HAZ, it was observed the dissolution of the M<SUB>23</SUB>C₆ carbides and smaller precipitates, the migration of the undissolved larger M<SUB>23</SUB>C₆ carbide and M₆ Ccarbide. It is also observed the liquation due to the simply melt of the segregated precipitates in the grain boundaries. Interestingly, the segregated second phases which simply melt in the grain boundaries more easily happened at higher heat input welding condition. High temperature tensile test was done at 300℃,700℃ and 900℃. It was obtained that the toughness of welded sample is lower compare to the non-welded sample.
The solution heat treatment at 1170℃ for 5 minutes was suggested to obtain a better mechanical properties of the shroud. The high cycle fatigue number of the repair welded shroud shows a much lower compare to the shroud. In addition, the high cycle fatigue number at room temperature after solution heat treatment was almost double compare to the before solution heat treatment under 420-500㎫ stress amplitude. However, the high cycle fatigue number of repaired welded sample was shown a much lower compare to the non- welded shroud and solution treated shroud. One of the main reasons to decrease the tensile strength and the high cycle fatigue properties of the repair welded shroud is the formation of the liquid phase in HAZ.
In this study, it was investigated the microstructure of the degraded shroud component and HAZ of repair welded shroud. In the HAZ, it was observed the dissolution of the M<SUB>23</SUB>C₆ carbides and smaller precipitates, the migration of the undissolved larger M<SUB>23</SUB>C₆ carbide and M₆ Ccarbide. It is also observed the liquation due to the simply melt of the segregated precipitates in the grain boundaries. Interestingly, the segregated second phases which simply melt in the grain boundaries more easily happened at higher heat input welding condition. High temperature tensile test was done at 300℃,700℃ and 900℃. It was obtained that the toughness of welded sample is lower compare to the non-welded sample.
The solution heat treatment at 1170℃ for 5 minutes was suggested to obtain a better mechanical properties of the shroud. The high cycle fatigue number of the repair welded shroud shows a much lower compare to the shroud. In addition, the high cycle fatigue number at room temperature after solution heat treatment was almost double compare to the before solution heat treatment under 420-500㎫ stress amplitude. However, the high cycle fatigue number of repaired welded sample was shown a much lower compare to the non- welded shroud and solution treated shroud. One of the main reasons to decrease the tensile strength and the high cycle fatigue properties of the repair welded shroud is the formation of the liquid phase in HAZ.
목차
Abstract
1. Introduction
2. Experiment
3. Results and Discussion
4. Conclusions
References
참고문헌 (15)
참고문헌 신청
E. R. Baek / 2013 / Heat treatment of the degraded hastelloy-X for high cycle fatigue properties / Proc. 9th Int. Conf. on Fracture and strength of solid 91
M. J. Ceslak / 1986 / The welding metallurgy of Hastelloy Alloy C-4, C-22 and C-276 / Metall. Trans. A 17:2035~2047
M. J. Perricone / 2006 / Effect of composition on the solidification behavior of several Ni-Cr-Mo and Fe-Ni-Cr-Mo alloys / Metall. Mater. Trans. A 37:1267~1280
R. B. Leonard / 1969 / Thermal stability of hastelloy alloy C-276 / Corrosion 25:222~228
이청래 / 2004 / 니켈기 초내열합금의 고온연성거동에 관한 연구 / 대한용접접합학회지 22(2):59~68
M. J. Ceslak / 1986 / The welding metallurgy of Hastelloy Alloy C-4, C-22 and C-276 / Metall. Trans. A 17:2035~2047
M. J. Perricone / 2006 / Effect of composition on the solidification behavior of several Ni-Cr-Mo and Fe-Ni-Cr-Mo alloys / Metall. Mater. Trans. A 37:1267~1280
R. B. Leonard / 1969 / Thermal stability of hastelloy alloy C-276 / Corrosion 25:222~228
이청래 / 2004 / 니켈기 초내열합금의 고온연성거동에 관한 연구 / 대한용접접합학회지 22(2):59~68
함께 읽어보면 좋을 논문
논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!
-
샤시 프레임의 용접부 내구성을 고려한 구조해석
한국기계기술학회지
2015 .01
-
쉬라우드가 장착된 풍력터빈 로터의 유입 유량 변동 특성 연구
풍력에너지저널
2016 .06
-
Super304H 용접부의 고온 피로파괴 특성
대한기계학회 춘추학술대회
2020 .12
-
평균응력 효과를 고려한 저주기 피로의 최신 연구동향
대한용접학회 특별강연 및 학술발표대회 개요집
2023 .10
-
Shrouded 프로브의 저압 조건 하에서의 흡인 효율 평가
한국기계가공학회 춘추계학술대회 논문집
2017 .04
-
해양용 고강도 강재 일면용접 피로성능 평가
대한용접학회 특별강연 및 학술발표대회 개요집
2016 .11
-
Super304H 용접부의 고온 피로파괴 특성
한국기계가공학회 춘추계학술대회 논문집
2021 .12
-
불안정 유동이 가스터빈 슈라우드 열전달에 미치는 영향
대한기계학회 춘추학술대회
2015 .11
-
파괴역학 기반 피로 수명 평가를 위한 피로 균열 진전 파라미터에 관한 연구
대한용접·접합학회지
2017 .02
-
9% Ni 강 용접부의 고주기 피로 거동 특성
한국정밀공학회 학술발표대회 논문집
2022 .05
-
Fatigue Analysis of the Effects of Incomplete Penetration Defects on Fatigue Crack Initiation Points in Butt-Welded Members
대한용접·접합학회지
2020 .12
-
Ported Shroud 원심압축기 성능에 미치는 운용고도의 영향
한국유체기계학회 논문집
2017 .08
-
Wind Tunnel Performance Test for Shrouded Probes
한국방사성폐기물학회 학술대회
2019 .01
-
Fatigue Life Evaluation of Tubular Joints with Hidden Welds Using 3D Fatigue FE Analysis
대한토목학회 학술대회
2024 .10
-
진공 챔버 내 저온 환경 모사를 위한 스테인리스 스틸 튜브-구리 플레이트 타입 열 쉬라우드 제작 및 테스트
대한기계학회 논문집 B권
2021 .01
-
Low Cycle Fatigue Behavior and Life Prediction of Alloy 617 Base Metal and the Welded Joints at Room Temperature
대한기계학회 춘추학술대회
2015 .02
-
Experimental evaluation of fatigue strength for small diameter socket welded joints under vibration loading condition
Nuclear Engineering and Technology
2021 .11
-
Earthquake response of a core shroud for APR1400
Nuclear Engineering and Technology
2021 .08
-
이상조직강의 가스 메탈 아크 용접 겹치기 용접부의 피로 강도 및 파괴 거동
동력시스템공학회지
2018 .04
이 논문의 저자 정보
최근 본 자료
댓글(0)
0
UCI(KEPA) : I410-ECN-0101-2016-581-002081588