Thermodynamic modeling and experimental validation of the Fe-Al-Ni-Cr-Mo alloy system
- ORNL
- CompuTherm LLC, Madison, WI
- Hong Kong Polytechnic University
- Multi-Phase Services Inc., Knoxville
- University of Tennessee, Knoxville (UTK)
NiAl-type precipitate-strengthened ferritic steels have been known as potential materials for the steam turbine applications. In this study, thermodynamic descriptions of the B2-NiAl type nano-scaled precipitates and body-centered-cubic (BCC) Fe matrix phase for four alloys based on the Fe-Al-Ni-Cr-Mo system were developed as a function of the alloy composition at the aging temperature. The calculated phase structure, composition, and volume fraction were validated by the experimental investigations using synchrotron X-ray diffraction and atom probe tomography. With the ability to accurately predict the key microstructural features related to the mechanical properties in a given alloy system, the established thermodynamic model in the current study may significantly accelerate the alloy design process of the NiAl-strengthened ferritic steels.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1049188
- Journal Information:
- Materials Letters, Vol. 71; ISSN 0167-577X
- Country of Publication:
- United States
- Language:
- English
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