The effect of grain refinement on the room-temperature ductility of as-cast Fe{sub 3}Al-based alloys

Technical Report · Sat Dec 31 04:00:00 EST 1994

OSTI ID:52837

Viswanathan, S; Andleigh, V K; McKamey, C G ^[1]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Fe{sub 3}Al-based alloys exhibit poor room temperature ductility in the as-cast condition. In this study, the effect of grain refinement of the as-cast alloy on room-temperature ductility was investigated. Small melts of Fe-28 at. % Al-5 at. % Cr were inoculated with various alloying additions and cast into a 50 x 30 x 30-mm graphite mold. The resulting ingots were examined metallographically for evidence of grain refinement, and three-point bend tests were conducted on samples to assess the effect on room-temperature ductility. Ductility was assumed to correlate with the strain corresponding to the maximum stress obtained in the bend test. The results showed that titanium was extremely effective in grain refinement, although it severely embrittled the alloy in contents exceeding 1%. Boron additions strengthened the alloy significantly, while carbon additions reduced both the strength and ductility. The best ductility was found in an alloy containing titanium, boron, and carbon.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 52837
• Report Number(s): CONF-941144--132; ON: DE95010121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BORON
BORON ADDITIONS
CARBON
CARBON ADDITIONS
CHROMIUM ALLOYS
DUCTILITY
EXPERIMENTAL DATA
GRAIN REFINEMENT
IRON BASE ALLOYS
MECHANICAL TESTS
METALLURGICAL EFFECTS
TITANIUM
TITANIUM ALLOYS