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Microstructure and Damage Evolution of Inconel 740H Welded Joint during Creep Process at 750 °C

In this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM)... Full description

Journal Title: Journal of materials engineering and performance 2021-04-16, Vol.30 (6), p.4562-4571
Main Author: Xiao, Deming
Other Authors: Jing, Hongyang , Xu, Lianyong , Zhao, Lei , Han, Yongdian
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: New York: Springer US
ID: ISSN: 1059-9495
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title: Microstructure and Damage Evolution of Inconel 740H Welded Joint during Creep Process at 750 °C
format: Article
creator:
  • Xiao, Deming
  • Jing, Hongyang
  • Xu, Lianyong
  • Zhao, Lei
  • Han, Yongdian
subjects:
  • Analysis
  • Article
  • Characterization and Evaluation of Materials
  • Chemistry and Materials Science
  • Corrosion and Coatings
  • Electron microscopy
  • Engineering Design
  • Grain boundaries
  • Heat resistant alloys
  • Materials Science
  • Nickel alloys
  • Quality Control
  • Reliability
  • Safety and Risk
  • Tribology
  • Welding
ispartof: Journal of materials engineering and performance, 2021-04-16, Vol.30 (6), p.4562-4571
description: In this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM), no significant change for austenite grains occurs with increasing creep time from 1000 to 2651 h. Creep cavities mainly distributed along the grain boundaries are formed due to the existence of larger M 23 C 6 carbide. After the creep exposure for 2651 h, creep cracks are formed as a consequence of the coalescence of several creep cavities. In comparison to heat affected zone (HAZ), weld metal (WM) shows fewer creep cavities, which implies that WM exhibits superior creep property. No obvious textural features are present for Inconel 740H welded joint after creep at 750 °C for different regions. There is no significant coarsening for γ ′ precipitates in size, which implies that γ ′ precipitates show superior high-temperature stability. In comparison to BM and HAZ, WM shows higher dislocation density due to welding thermal cycling. The interaction behavior of dislocations and γ ′ precipitates was enhanced, which can significantly strengthen the γ matrix.
language: eng
source:
identifier: ISSN: 1059-9495
fulltext: no_fulltext
issn:
  • 1059-9495
  • 1544-1024
url: Link


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titleMicrostructure and Damage Evolution of Inconel 740H Welded Joint during Creep Process at 750 °C
creatorXiao, Deming ; Jing, Hongyang ; Xu, Lianyong ; Zhao, Lei ; Han, Yongdian
creatorcontribXiao, Deming ; Jing, Hongyang ; Xu, Lianyong ; Zhao, Lei ; Han, Yongdian
descriptionIn this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM), no significant change for austenite grains occurs with increasing creep time from 1000 to 2651 h. Creep cavities mainly distributed along the grain boundaries are formed due to the existence of larger M 23 C 6 carbide. After the creep exposure for 2651 h, creep cracks are formed as a consequence of the coalescence of several creep cavities. In comparison to heat affected zone (HAZ), weld metal (WM) shows fewer creep cavities, which implies that WM exhibits superior creep property. No obvious textural features are present for Inconel 740H welded joint after creep at 750 °C for different regions. There is no significant coarsening for γ ′ precipitates in size, which implies that γ ′ precipitates show superior high-temperature stability. In comparison to BM and HAZ, WM shows higher dislocation density due to welding thermal cycling. The interaction behavior of dislocations and γ ′ precipitates was enhanced, which can significantly strengthen the γ matrix.
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subjectAnalysis ; Article ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Corrosion and Coatings ; Electron microscopy ; Engineering Design ; Grain boundaries ; Heat resistant alloys ; Materials Science ; Nickel alloys ; Quality Control ; Reliability ; Safety and Risk ; Tribology ; Welding
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descriptionIn this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM), no significant change for austenite grains occurs with increasing creep time from 1000 to 2651 h. Creep cavities mainly distributed along the grain boundaries are formed due to the existence of larger M 23 C 6 carbide. After the creep exposure for 2651 h, creep cracks are formed as a consequence of the coalescence of several creep cavities. In comparison to heat affected zone (HAZ), weld metal (WM) shows fewer creep cavities, which implies that WM exhibits superior creep property. No obvious textural features are present for Inconel 740H welded joint after creep at 750 °C for different regions. There is no significant coarsening for γ ′ precipitates in size, which implies that γ ′ precipitates show superior high-temperature stability. In comparison to BM and HAZ, WM shows higher dislocation density due to welding thermal cycling. The interaction behavior of dislocations and γ ′ precipitates was enhanced, which can significantly strengthen the γ matrix.
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abstractIn this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM), no significant change for austenite grains occurs with increasing creep time from 1000 to 2651 h. Creep cavities mainly distributed along the grain boundaries are formed due to the existence of larger M 23 C 6 carbide. After the creep exposure for 2651 h, creep cracks are formed as a consequence of the coalescence of several creep cavities. In comparison to heat affected zone (HAZ), weld metal (WM) shows fewer creep cavities, which implies that WM exhibits superior creep property. No obvious textural features are present for Inconel 740H welded joint after creep at 750 °C for different regions. There is no significant coarsening for γ ′ precipitates in size, which implies that γ ′ precipitates show superior high-temperature stability. In comparison to BM and HAZ, WM shows higher dislocation density due to welding thermal cycling. The interaction behavior of dislocations and γ ′ precipitates was enhanced, which can significantly strengthen the γ matrix.
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doi10.1007/s11665-021-05759-4