SYMPOSIA PAPER Published: 24 August 2020

Crack Propagation Behavior of Induction Hardened D6AC Alloy


An investigation of the crack propagation behavior of a dual toughness material, induction hardened D6AC alloy, was conducted employing compact tension specimens. The effect of R value, the minimum to maximum load ratio, was included in the investigation. The presence of a hardness transition zone located at the core to case boundary mitigated crack propagation. The greater the R value, the less the suppression in growth rate. Comparison of crack length versus cycles with the through hardened alloy indicates a tenfold to fivefold increase in fatigue life at stress ratios of 0.1 and 0.5, respectively, for the induction hardened alloy. The reduced crack growth behavior can be modeled by the existence of a residual compressive stress-intensity field resulting from the hardening process.

Author Information

Mattavi, J., L.
Hamilton Standard Division, United Technologies Corp., Windsor Locks, Conn., US
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Developed by Committee: E08
Pages: 389–401
DOI: 10.1520/STP791B1983023
ISBN-EB: 978-0-8031-7720-8
ISBN-13: 978-0-8031-0729-8