Creep properties of advanced austenitic steel 709 determined through short experiments under in-situ neutron diffraction followed by TEM characterization

Yuchen Zhao; Ryan Schoell; Ce Zheng; Mahmut N. Cinbiz; Matthew Frost; Ke An; Djamel Kaoumi

doi:10.1016/j.matchar.2021.111519

Creep properties of advanced austenitic steel 709 determined through short experiments under in-situ neutron diffraction followed by TEM characterization

Yuchen Zhao, Ryan Schoell, Ce Zheng, Mahmut N. Cinbiz, Matthew Frost, Ke An, Djamel Kaoumi

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

In this study, the creep mechanisms at play in Alloy 709 (Fe-20Cr-25Ni) are investigated by performing short-term creep-type tests under in-situ neutron diffraction experiments. Short tests are performed in the temperature range of 500 to 900 °C under constant load with a load ranging from 50 to 150 MPa. The creep exponent and activation energy are determined using the Bird-Mukherjee-Dorn relation and compared to that obtained from conventional longer creep tests from the literature. Scanning transmission electron microscopy (S/TEM) of the post-creep microstructure indicates that interaction of dislocations with precipitates are a dominant mechanism at play. Furthermore, local elemental mapping indicated chemical segregation at grain boundaries and formation of complex precipitates.

Original language	English
Article number	111519
Journal	Materials Characterization
Volume	182
DOIs	https://doi.org/10.1016/j.matchar.2021.111519
State	Published - Dec 2021
Externally published	Yes

Funding

This research used resources of the Spallation Neutron Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Oak Ridge National Laboratory. The authors gratefully acknowledge the financial support from DOE Nuclear Energy University Programs (NEUP), (Project #15-8582). This research used resources of the Spallation Neutron Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Oak Ridge National Laboratory . The authors gratefully acknowledge the financial support from DOE Nuclear Energy University Programs (NEUP), (Project #15-8582 ).

Funders	Funder number
U.S. Department of Energy
Office of Science
Oak Ridge National Laboratory
Nuclear Energy University Program	15-8582

Keywords

Alloy 709
Creep
In-situ neutron diffraction
Transmission electron microscopy

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10.1016/j.matchar.2021.111519

Cite this

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title = "Creep properties of advanced austenitic steel 709 determined through short experiments under in-situ neutron diffraction followed by TEM characterization",

abstract = "In this study, the creep mechanisms at play in Alloy 709 (Fe-20Cr-25Ni) are investigated by performing short-term creep-type tests under in-situ neutron diffraction experiments. Short tests are performed in the temperature range of 500 to 900 °C under constant load with a load ranging from 50 to 150 MPa. The creep exponent and activation energy are determined using the Bird-Mukherjee-Dorn relation and compared to that obtained from conventional longer creep tests from the literature. Scanning transmission electron microscopy (S/TEM) of the post-creep microstructure indicates that interaction of dislocations with precipitates are a dominant mechanism at play. Furthermore, local elemental mapping indicated chemical segregation at grain boundaries and formation of complex precipitates.",

keywords = "Alloy 709, Creep, In-situ neutron diffraction, Transmission electron microscopy",

author = "Yuchen Zhao and Ryan Schoell and Ce Zheng and Cinbiz, {Mahmut N.} and Matthew Frost and Ke An and Djamel Kaoumi",

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year = "2021",

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language = "English",

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T1 - Creep properties of advanced austenitic steel 709 determined through short experiments under in-situ neutron diffraction followed by TEM characterization

AU - Zhao, Yuchen

AU - Schoell, Ryan

AU - Zheng, Ce

AU - Cinbiz, Mahmut N.

AU - Frost, Matthew

AU - An, Ke

AU - Kaoumi, Djamel

PY - 2021/12

Y1 - 2021/12

N2 - In this study, the creep mechanisms at play in Alloy 709 (Fe-20Cr-25Ni) are investigated by performing short-term creep-type tests under in-situ neutron diffraction experiments. Short tests are performed in the temperature range of 500 to 900 °C under constant load with a load ranging from 50 to 150 MPa. The creep exponent and activation energy are determined using the Bird-Mukherjee-Dorn relation and compared to that obtained from conventional longer creep tests from the literature. Scanning transmission electron microscopy (S/TEM) of the post-creep microstructure indicates that interaction of dislocations with precipitates are a dominant mechanism at play. Furthermore, local elemental mapping indicated chemical segregation at grain boundaries and formation of complex precipitates.

AB - In this study, the creep mechanisms at play in Alloy 709 (Fe-20Cr-25Ni) are investigated by performing short-term creep-type tests under in-situ neutron diffraction experiments. Short tests are performed in the temperature range of 500 to 900 °C under constant load with a load ranging from 50 to 150 MPa. The creep exponent and activation energy are determined using the Bird-Mukherjee-Dorn relation and compared to that obtained from conventional longer creep tests from the literature. Scanning transmission electron microscopy (S/TEM) of the post-creep microstructure indicates that interaction of dislocations with precipitates are a dominant mechanism at play. Furthermore, local elemental mapping indicated chemical segregation at grain boundaries and formation of complex precipitates.

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KW - In-situ neutron diffraction

KW - Transmission electron microscopy

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JF - Materials Characterization

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Creep properties of advanced austenitic steel 709 determined through short experiments under in-situ neutron diffraction followed by TEM characterization

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Keywords

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