Back to Search
Start Over
Heterogeneous Creep Deformations and Correlation to Microstructures in Fe-30Cr-3Al Alloys Strengthened by an FeNb Laves Phase.
- Source :
- Metallurgical & Materials Transactions. Part A; Oct2017, Vol. 48 Issue 10, p4598-4614, 17p, 1 Illustration
- Publication Year :
- 2017
-
Abstract
- A new Fe-Cr-Al (FCA) alloy system has been developed with good oxidation resistance and creep strength at high temperature. The alloy system is a candidate for use in future fossil-fueled power plants. The creep strength of these alloys at 973 K (700 °C) was found to be comparable with traditional 9 pct Cr ferritic-martensitic steels. A few FCA alloys with general composition of Fe-30Cr-3Al-.2Si- xNb ( x = 0, 1, or 2) with a ferrite matrix and FeNb-type Laves precipitates were prepared. The detailed microstructural characterization of samples, before and after creep rupture testing, indicated precipitation of the Laves phase within the matrix, Laves phase at the grain boundaries, and a 0.5 to 1.5 μm wide precipitate-free zone (PFZ) parallel to all the grain boundaries. In these alloys, the areal fraction of grain boundary Laves phase and the width of the PFZ controlled the cavitation nucleation and eventual grain boundary ductile failure. A phenomenological model was used to compare the creep strain rates controlled by the effects of the particles on the dislocations within the grain and at grain boundaries. (The research sponsored by US-DOE, Office of Fossil Energy, the Crosscutting Research Program). [ABSTRACT FROM AUTHOR]
- Subjects :
- DEFORMATIONS (Mechanics)
MICROALLOYING
AMALGAMATION
ALLOYS
METALLIC composites
Subjects
Details
- Language :
- English
- ISSN :
- 10735623
- Volume :
- 48
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Metallurgical & Materials Transactions. Part A
- Publication Type :
- Academic Journal
- Accession number :
- 124967963
- Full Text :
- https://doi.org/10.1007/s11661-017-4274-8