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Effects of temperature on superplastic and fracture behaviors of a Ni-Co-based superalloy.
- Source :
-
Journal of Alloys & Compounds . Oct2023, Vol. 958, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- The effects of deformation temperatures on the superplastic behavior, microstructure evolution, and failure mechanisms of Ni-Co-based superalloy were analyzed at temperatures ranging from 900 to 1140 °C. The superplastic-tensile temperatures have significant effects on flow behavior, which shows distinctive features of dynamic recrystallization (DRX). The alloy exhibits a striking increase in elongation with increasing the superplastic-tensile temperature to 1100 °C, reaching 1760 %. The deformed microstructure was characterized using SEM, EBSD, and TEM. As the superplastic-tensile temperatures increased, the DRX-grain fraction increased. The superplastic deformation of the alloy is primarily governed by discontinuous-DRX (DDRX) mechanism. Continuous-DRX (CDRX) had a significant effect at 900 °C and occurs as an assistant mechanism during superplastic deformation of the alloy at elevated temperatures. The fracture at 900 °C was initiated by a combination of intergranular and micro-void coalescences, while the pure intergranular fracture takes place above 1050 °C. Meanwhile, the micro-void coalescence has only a minor effect on the fracture behavior at 1140 °C. • Superalloys are usually sensitive to hot deformation parameters. • The flow behavior during hot deformation is complex. • The flow behavior affects the mechanical properties of superalloys, making microstructure control critical to optimization. • Microstructure evolution, deformation, and failure mechanisms are significantly affected by the deformation temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 958
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 163931915
- Full Text :
- https://doi.org/10.1016/j.jallcom.2023.170524