Dislocation/particle interactions in {beta}{prime}(NiAl) precipitation strengthened ferritic Fe-19Cr-4Ni-2Al alloy
- City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science
Ferritic Fe-Cr-Al stainless alloys are candidate materials for a wide range of high technology applications, where oxidation resistance is the major consideration. These alloys have several potential advantages, i.e., lower raw material cost, superior oxidation resistance, lower density, and a lower thermal expansion coefficient than the Ni-base superalloys. In spite of their favorable properties, however, these alloys have not yet been applied above 873 K due to their poor creep and fatigue properties at high temperatures. To meet the needs for elevated temperature applications above 873 K, the Fe-Cr-Al alloys can be strengthened by the addition of a small amount of nickel to form NiAl-type precipitates. Previous studies have shown that the addition of 2 to 4 wt pct Ni to Fe-19Cr-2Al alloy, followed by subsequent aging treatment, leads to the precipitation of an ordered coherent {beta}{prime} phase, thereby significantly increasing the mechanical properties of the alloy at room temperature. A systematic study has been conducted by the present authors aiming to contribute to the understanding of the high-temperature creep and fatigue behavior of the precipitate hardened ferritic Fe-19Cr-4Ni-2Al alloy. This article reports on the dislocation/particle configurations and interactions developed in the precipitation strengthened ferritic Fe-19Cr-4Ni-2Al alloy subjected to tensile creep deformation.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 484857
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 28, Issue 4; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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