SYMPOSIA PAPER Published: 01 January 1967

Fatigue-Crack Propagation in Some Ultrahigh-Strength Steels


Fatigue-crack propagation studies were carried out on some ultrahigh-strength steels in controlled environments using the fracture-mechanics approach. The steels investigated include a medium-carbon low-alloy ultrahigh-strength steel tempered to two strength and toughness levels, a 250-grade 18Ni maraging steel, and a 300-grade 18Ni steel. The results indicate that, in the inert environment, the rates of fatigue-crack propagation in these steels are about the same and show no obvious correlation with other mechanical properties of the steels. The sensitivity of the rates of fatigue-crack propagation to the presence of moisture in the test environment shows rough correlation with plane-strain fracture toughness for steels of similar composition. The role of water vapor in promoting fatigue-crack propagation is considered. The results are also discussed in terms of existing theories and metallographic observations.

Author Information

Wei, R., P.
Cornell University, Ithaca, N. Y.
Talda, P., M.
Cornell University, Ithaca, N. Y.
Li, Che-Yu
Cornell University, Ithaca, N. Y.
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E08
Pages: 460–485
DOI: 10.1520/STP47239S
ISBN-EB: 978-0-8031-6910-4
ISBN-13: 978-0-8031-6633-2