Effect of niobium addition on the mechanical properties of Fe{sub 3}Al-based alloys
- Southeast Univ., Nanjing (China). Dept. of Materials Science and Engineering
Alloys based on Fe{sub 3}Al are of interest because of their excellent oxidation resistance and low cost. However, low strength above 600 C and a lack of ductility at room temperature limit their use as structural materials. The purpose of the present paper is to investigate the effect of variations of niobium concentration in the polynery alloy of Fe-28Al-5Cr-0.5Mo-0.05B-0.05Zr- (up to 0.8Nb) on mechanical properties at room temperature (RT) and high temperature of 600 C. It was found that small amounts (0.5--0.8at%) of niobium addition to the polynery alloys based on Fe{sub 3}Al (Fe-28Al-5Cr-0.5Mo-0.05Zr-0.05B) increases the yield strength and creep resistance greatly but is not beneficial to room temperature ductility. Results of microanalysis indicate that the addition of niobium causes the formation of a lot of precipitates with complex compositions which strengthen both matrix and grain boundaries.
- OSTI ID:
- 136952
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 33, Issue 12; Other Information: PBD: 15 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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