In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel
Abstract
Here, creep deformation mechanism of Grade 91 steel at 650 °C was investigated in-situ via wide-angle X-ray scattering (WAXS). WAXS peak broadening and a modified Williamson-Hall analysis provided information on evolution of dislocation densities in the primary α–Fe phase, while WAXS peak shifts provided lattice strains in the α–Fe matrix, M 23C 6 and MX precipitates. Load transfer was not evident during in-situ creep deformation, suggesting that precipitates did not significantly strengthen the matrix during creep deformation. Peak broadening results illustrated an increase in average dislocation density during primary stage creep. After onset of secondary creep, there was a decrease in dislocation density, attributed to annihilation and re-ordering of dislocations in the subgrain structure, followed by a relatively constant average dislocation density with increasing strain.
- Authors:
-
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Energy Enabling Technologies (NEET)
- OSTI Identifier:
- 1487032
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 737; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Grade 91 steel; Creep; High-energy X-ray diffraction; Dislocation density
Citation Formats
Laliberte, Fallon, Li, Meimei, Almer, Jonathan, and Liu, Li. In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel. United States: N. p., 2018.
Web. doi:10.1016/j.msea.2018.09.033.
Laliberte, Fallon, Li, Meimei, Almer, Jonathan, & Liu, Li. In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel. United States. doi:10.1016/j.msea.2018.09.033.
Laliberte, Fallon, Li, Meimei, Almer, Jonathan, and Liu, Li. Wed .
"In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel". United States. doi:10.1016/j.msea.2018.09.033. https://www.osti.gov/servlets/purl/1487032.
@article{osti_1487032,
title = {In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel},
author = {Laliberte, Fallon and Li, Meimei and Almer, Jonathan and Liu, Li},
abstractNote = {Here, creep deformation mechanism of Grade 91 steel at 650 °C was investigated in-situ via wide-angle X-ray scattering (WAXS). WAXS peak broadening and a modified Williamson-Hall analysis provided information on evolution of dislocation densities in the primary α–Fe phase, while WAXS peak shifts provided lattice strains in the α–Fe matrix, M23C6 and MX precipitates. Load transfer was not evident during in-situ creep deformation, suggesting that precipitates did not significantly strengthen the matrix during creep deformation. Peak broadening results illustrated an increase in average dislocation density during primary stage creep. After onset of secondary creep, there was a decrease in dislocation density, attributed to annihilation and re-ordering of dislocations in the subgrain structure, followed by a relatively constant average dislocation density with increasing strain.},
doi = {10.1016/j.msea.2018.09.033},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 737,
place = {United States},
year = {2018},
month = {9}
}
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