Effect of heterogeneous microstructure on the tensile and creep performances of cast Haynes 282 alloy
Journal Article
·
· Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Energy Industries of Ohio, Independence, OH (United States)
Precipitation-strengthened Ni-based superalloys are leading candidate materials for advanced ultra-supercritical (A-USC) plants with steam conditions up to 760 °C (1400 °F) and 35 MPa (5 ksi). This study evaluates representative specimens from a large casting of Haynes 282 to study the effect of microstructural heterogeneity on the mechanical behavior of this alloy. The tensile test results of cast Haynes 282 over the temperature range 20–816 °C exhibited lower tensile strength and ductility in comparison with the reference wrought Haynes 282. However, the creep rupture tests of the cast alloy below 704–788 °C and 190–431 MPa presented a similar stress-Larson-Miller parameter to that of the wrought material. Microstructural and dislocation characterizations using scanning electron microscopy, conventional transmission electron microscopy, and scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy were performed to understand the microstructural evolution before and after the mechanical tests. The heterogeneous microstructures of the cast Haynes 282 material, including the coarse grains, potential casting defects, and a bimodal size distribution of γ' precipitates, were detrimental to the tensile behavior, whereas the coarse-scale grains had a positive effect on the creep performance because diffusional creep was the dominant creep mechanism.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1836452
- Alternate ID(s):
- OSTI ID: 1868828
- Journal Information:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: N/A Vol. 828; ISSN 0921-5093
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructure and mechanical properties of friction stir welded Haynes 282
Effects of applied stress and grain size on creep-rupture lifetime prediction for Haynes 282 alloy
Laser Powder Bed Fusion Manufactured Alloys 625 and 282 and Properties Relevant to Advanced Nuclear Components
Journal Article
·
Tue Oct 26 20:00:00 EDT 2021
· Materials Characterization
·
OSTI ID:1908804
Effects of applied stress and grain size on creep-rupture lifetime prediction for Haynes 282 alloy
Journal Article
·
Sun Feb 06 19:00:00 EST 2022
· Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
·
OSTI ID:1845775
Laser Powder Bed Fusion Manufactured Alloys 625 and 282 and Properties Relevant to Advanced Nuclear Components
Technical Report
·
Mon Jun 30 20:00:00 EDT 2025
·
OSTI ID:3002311