Mechanical properties of ductile Fe[sub 3]Al-based plates

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90267-V· OSTI ID:6401255

Gieseke, B G; Alexander, D J; Sikka, V K; Baldwin, R H ^[1]

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1. Oak Ridge National Lab., TN (United States)

Iron aluminides based on the ordered Fe[sub 3]Al composition have good oxidation resistance and excellent sulfidation resistance. Furthermore, they offer advantages over stainless steels, including lower density and reduced consumption of strategic elements including chromium. In the past, the major drawbacks to the use of these materials in structural applications have been low room-temperature (RT) ductility (<5%) and a rapid drop in strength at temperatures above 600[degree]C. Recently, by a combination of thermomechanical processing and heat treatment, the RT ductility has been increased into the range of 15 to 20%, and the high-temperature tensile and creep strengths have been increased by the addition of 1% Nb. While there is a growing data base on the properties of sheet material, little data exist on the mechanical properties of plate products, and no fatigue data are openly available. In this paper, the tensile, creep, and fatigue properties of ductile Fe[sub 3]Al plate in two thicknesses are investigated and, when possible, compared to sheet properties. In addition, the results of Charpy-impact toughness tests are reported for one plate. The alloy investigated is designated FA-129, which is an ordered Fe[sub 3]Al alloy with a composition tailored for high-temperature strength. The results show differences in tensile and creep properties for plate and sheet products. The results of high-cycle fatigue tests show that cyclic loading at stresses below the yield strength does not include fatigue failure at temperatures of 25 and 454[degree]C and that there is an effect of plate thickness at 600[degree]C.

• OSTI ID: 6401255
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:1; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
IRON ALLOYS
CHARPY TEST
CORROSION RESISTANCE
CREEP
DUCTILITY
EXPERIMENTAL DATA
FAILURES
FATIGUE
INTERMETALLIC COMPOUNDS
TENSILE PROPERTIES
THICKNESS
ALLOYS
DATA
DESTRUCTIVE TESTING
DIMENSIONS
IMPACT TESTS
INFORMATION
MATERIALS TESTING
MECHANICAL TESTS
NUMERICAL DATA
TESTING
360103* - Metals &amp; Alloys- Mechanical Properties