In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel

Laliberte, Fallon; Li, Meimei; Almer, Jonathan; Liu, Li

doi:10.1016/j.msea.2018.09.033

Title: In-situ synchrotron X-ray study of microstructural evolution during creep deformation in Grade 91 steel

Journal Article · Wed Sep 12 00:00:00 EDT 2018 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2018.09.033· OSTI ID:1487032

Laliberte, Fallon ^[1]; Li, Meimei ^[2]; Almer, Jonathan ^[2]; Liu, Li ^[1]

Rensselaer Polytechnic Inst., Troy, NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy Enabling Technologies (NEET); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1487032

Alternate ID(s):: OSTI ID: 1636604

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 737, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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