Slow crack growth at room temperature in FeAl

Extruded and annealed Fe-40 at.% Al bend specimens with chevron notches were tested in 3-point bending at room temperature in ambient air. For slow crack propagation rates on the order of 0.1 mu m/s the stress intensity factor K sub(I) reached a threshold value of approximately 17 MPa m super( is eq...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1993-02, Vol.28 (3), p.389-393
Main Authors: Schneibel, J.H., Jenkins, M.G.
Format: Article
Language:English
Subjects:
Applied sciences
Coating
Exact sciences and technology
Joining, thermal cutting: metallurgical aspects
Metals. Metallurgy
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Summary:Extruded and annealed Fe-40 at.% Al bend specimens with chevron notches were tested in 3-point bending at room temperature in ambient air. For slow crack propagation rates on the order of 0.1 mu m/s the stress intensity factor K sub(I) reached a threshold value of approximately 17 MPa m super( is equivalent ). At rates of 300 mu m/s, values of approximately equals 40 MPa m super( is equivalent ) were obtained. This effect is qualitatively similar to the effect of strain rate on the ductility of iron aluminides, and it is consistent with their sensitivity to environmental embrittlement.
ISSN:0956-716X
DOI:10.1016/0956-716X(93)90447-Z