[논문]Fatigue Life of the Repair TIG Welded Hastelloy X Superalloy

SIHOTANG, Restu; CHOI, Sang-Kyu; PARK, Sung-Sang; BAEK, Eung-Ryul

doi:10.5781/jwj.2015.33.5.26

Abstract ▼ AI-Helper

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 precipi...

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 $M_{23}C_6$ carbide, $M_6$ Ccarbide and small percentage of sigma(${\sigma}$) phase. Furthermore, it was confirmed the nano size of ${\sigma}$ and miu (${\mu}$) 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 $M_{23}C_6$ carbides and smaller precipitates, the migration of the undissolved larger $M_{23}C_6$ carbide and $M_6$ 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 $300^{\circ}C$, $700^{\circ}C$ and $900^{\circ}C$. It was obtained that the toughness of welded sample is lower compare to the non-welded sample. The solution heat treatment at $1170^{\circ}C$ 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 420-500MPa 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.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

문제 정의

This study focuses on the investigation of fatigue and high temperature tensile properties of repaired crack shroud by TIG welding.

가설 설정

2. HAZ of low heat input welded sample is strong enough to prevent the tensile failure at high tem- perature.
3. Liquation and geometry factor simultaneously cause an earlier fatigue fracture in HAZ of welded sample.

제안 방법

In this study, the high temperature tensile test was done for low heat input welded shroud and shroud. The result is shown in Fig.

대상 데이터

The basic research data were obtained by scanning electron microscope (SEM), and transmission electron microscope (TEM). A SEM Hitachi FE-SEM 4800 with 15 kV along with energy dispersive spectroscopy (EDS) analysis was utilized to examine the change of microstructure in the HAZ.
The high temperature tensile specimen was prepared according to the ASTM E8 and was done by Zwick 10 ton class Z100 tensile tester. High cycle fatigue test at room temperature was done for shroud, welded shroud and ST shroud.
The repair welding (henceforth referred to as welded shroud) was made by TIG (with filler) and the procedure was prepared in table 2. The type of filler metal as AMS 5798 standard, 3/16 wire filler diameter.
The shroud was provided by the Institute of Aviation Technology, South Korea. It is 0.

이론/모형

High cycle fatigue test was done at frequency 50 kHz with load ratio (σmin/σmax) = 0.1 and samples were prepared according to the ASTM E466.

참고문헌 (15)

E. R. Baek, S. S. Park, R. S. Sihotang and S. K. Choi, Heat treatment of the degraded hastelloy-X for high cycle fatigue properties, Proc. 9th Int. Conf. on Fracture and strength of solid, 91 (2013)
M. J. Ceslak, T. J. Headley and A. D. Romig, Jr, The welding metallurgy of Hastelloy Alloy C-4, C-22 and C-276, Metall. Trans. A, 17A, 1986, 2035-2047
M. J. Perricone and J. N. DuPont, Effect of composition on the solidification behavior of several Ni-Cr-Mo and Fe-Ni-Cr-Mo alloys, Metall. Mater. Trans. A, 37A (2006), 1267-1280
R. B. Leonard, Thermal stability of hastelloy alloy C-276, Corrosion, 25 (1969), 222-228.

상세보기
C.R. Lee, S.H.Um, S.W. Kim, and C.H.Lee: A study on hot ductility behavior of Ni-based superalloys, Journal of KWJS, 22-2 (2004), 157-166 (in Korean)
Y.S.Kim, Y.G.Choi, C.H.Lim, and J.D.Kim, A study on the abrasive wear properties of the PTA overlay layers using the super alloy powder, Journal of KWJS, 27-3 (2009), 80-84 (in Korean)
M. J. Perricone, J. N. Dupont and M. J. Cieslak, Solidification of hastelloy alloys : an alternative interpretation, Metall. Mater. Trans. A, 34A (2003), 1127-1132.
R. Sihotang, P. Sung-Sang and B.Eung-Ryul, Effect of heat input on microstructure of tungsten inert gas welding used hastelloy-X, Material Research Innovatios. 18 (2014), 1074-1080
O. A. Ojo and M. C. Chaturvedi, Liquation microfissuring in the weld heat-affected zone of an overaged precipitation-hardened nickelbase superalloy, Metall. Mater. Trans. A, 38A (2007), 356-369.
L. O. Osoba, R. K. Sidhu and O. A. Ojo, On preventing HAZ cracking in laser welded DS Rene 80 superalloy, Mater. Sci. Technol., 27 (2011), 897-902.

상세보기
Z. Tang, J. Li, R. Hu, Y. Liu, and G. Bai, Effect of solution heat treatment on carbide of Ni-Cr-W superalloy, Rare Met. Mater. Eng., 39 (7) (2010), 1157-1161

상세보기
Z. Yanping, K. Lizhong and X. Xishan, Influence of thermal exposure on the precipitates and mechanical properties of a newly developed Ni-21Cr-17Mo alloy, Mater. Sci. Eng. A, 560 (2013), 611-617

상세보기
X.Z. Qin, J.T. Guo, C. Yuan, J.S. Hou, L.Z. Zhou and H.Q. Ye, Long-term thermal exposure response of the microstructure and properties of a cast Ni-base superalloy, Mater. Sci. Eng. A, 543 (2012), 121-128

상세보기
B. Guanghai, L. Jinshan, H. Rui, Z. Tiebang, K. Hongchao and F. Hengzhi, Effect of thermal exposure on the stability of carbides in Ni-Cr-W base superalloy, Mater. Sci. Eng. A, 528 (2011), 2339-2344

상세보기
N. L. Richards, R. Nakkalil and M. C. Chaturvedi, The influence of electron-beam welding parameters on heataffected-zone microfissuring in Incoloy 903, Metall. Mater. Trans. A, 25A (1994), 1733-1745.

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증

Fatigue Life of the Repair TIG Welded Hastelloy X Superalloy 원문보기

Abstract ▼ AI-Helper

주제어

AI 본문요약
AI-Helper

문제 정의

가설 설정

제안 방법

대상 데이터

이론/모형

참고문헌 (15)

이 논문을 인용한 문헌

저자의 다른 논문 :

관련 콘텐츠

원문 보기

원문 URL 링크

이 논문과 함께 이용한 콘텐츠

AI-Helper ※ AI-Helper는 오픈소스 모델을 사용합니다.

선택된 텍스트

연합인증

Fatigue Life of the Repair TIG Welded Hastelloy X Superalloy 원문보기

Abstract ▼ AI-Helper

주제어

AI 본문요약 엑셀 다운로드 AI-Helper

문제 정의

가설 설정

제안 방법

대상 데이터

이론/모형

참고문헌 (15)

이 논문을 인용한 문헌

저자의 다른 논문 :

최상규 (2)

관련 콘텐츠

원문 보기

원문 URL 링크

이 논문과 함께 이용한 콘텐츠

AI-Helper ※ AI-Helper는 오픈소스 모델을 사용합니다.

선택된 텍스트

AI 본문요약
AI-Helper