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

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

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

Journal Article · Tue Oct 12 00:00:00 EDT 2021 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2021.111519· OSTI ID:1855652

Zhao, Yuchen ^[1]; Schoell, Ryan ^[1]; Zheng, Ce ^[1]; Cinbiz, Mahmut N. ^[2]; ^[3]; ^[3]; Kaoumi, Djamel ^[1]

North Carolina State Univ., Raleigh, NC (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here 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.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1855652

Alternate ID(s):: OSTI ID: 1828798

Journal Information:: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 2021 Vol. 182; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
alloy 709
creep
in-situ neutron diffraction
transmission electron microscopy

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

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