SYMPOSIA PAPER
Published:
01 January 1979
STP35884S
On the Process of Subsurface Fatigue Crack Initiation in Ti-6Al-4V
SourceThe process of subsurface crack initiation in Ti-6AI-4V has been investigated in some detail. At low stress amplitudes, slip occurs primarily on prism planes and is blocked at α-β interfaces. The piled-up dislocations induce slip in the β-phase under cyclic loading which can lead to the formation of a Cottrell cleavage knife and thereby provide a site for subsurface crack initiation. At high stress amplitudes, pyramidal slip becomes operative and as a consequence a more compatible type of plastic deformation between the two phases can develop. Under these circumstances the tendency for subsurface crack initiation may be reduced.
Author Information
Ruppen, J
Institute of Materials Science, University of Connecticut, Storrs, Conn.
Bhowal, P
Institute of Materials Science, University of Connecticut, Storrs, Conn.
Eylon, D
University of Cincinnati, Cincinnati, Ohio
McEvily, AJ
Institute of Materials Science, University of Connecticut, Storrs, Conn.
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Details
Developed by Committee: E08
Pages: 47–68
DOI: 10.1520/STP35884S
ISBN-EB: 978-0-8031-4744-7
ISBN-13: 978-0-8031-0345-0