Microstructure evolution and deformation mechanisms of the electroslag refined-continuous directionally solidified (ESR-CDS®) superalloy Rene88DT during isothermal compression

The microstructure evolution and deformation mechanisms of alloy Rene88DT prepared by ESR-CDS® during isothermal compression have been investigated by optical microscopy (OM), electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). The results showed that two cycles of...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-06, Vol.638, p.152-164
Main Authors: Fu, Rui, Li, Fulin, Yin, Fajie, Feng, Di, Tian, Zhiling, Chang, Litao
Format: Article
Language:English
Subjects:
Compressing
Deformation
Deformation mechanism
Deformation mechanisms
Dynamic recrystallization
Electron back scatter diffraction
ESR-CDS
Evolution
Grain boundaries
Isothermal compression
Microstructure
Microstructure evolution
Rene88DT superalloy
True strain
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Summary:The microstructure evolution and deformation mechanisms of alloy Rene88DT prepared by ESR-CDS® during isothermal compression have been investigated by optical microscopy (OM), electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). The results showed that two cycles of dynamic recrystallization (DRX) occurred during the compressive deformation of the sample at super-solvus temperature with total true strain of 1.2, and this led to a near completely recrystallized fine-grained microstructure. For samples deformed at sub-solvus temperature, only one cycle of DRX occurred during compression with total true strain of 1.2, resulting in a partial recrystallized microstructure, and large misorientation formed in the un-recrystallized coarse grains. DRX is mainly initiated at the columnar grain boundaries or stimulated by the carbide particles within the grains. The main DRX mechanisms are grain boundary bulging and migration, second phase particles stimulation, sub-grain coarsening and migration.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.04.068