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Title: 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:
 [1];  [2];  [2];  [1]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States)
  2. 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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