SYMPOSIA PAPER Published: 01 January 1973
STP38838S

Thermal-Mechanical Fatigue Crack Propagation in Nickel- and Cobalt-Base Superalloys Under Various Strain-Temperature Cycles

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Crack propagation rates under isothermal and thermal fatigue cycling have been determined for a conventionally-cast cobalt-base superalloy, and conventionally-cast and directionally-solidified nickel-base superalloys. Linear elastic fracture mechanics, where the crack growth rates under different strain ranges or for various crack lengths depend only on the strain intensity factor range, was found to be applicable over the range of crack growth rates of most practical importance. A comparison of crack growth rates is made for thermal fatigue under various strain-temperature cycles and isothermal low-cycle fatigue, and the influence of coatings and superimposed creep is discussed.

Author Information

Rau, CA
Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, Middletown, Conn.
Gemma, AE
Pratt & Whitney Aircraft, East Hartford, Conn.
Leverant, GR
Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, Middletown, Conn.
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Details
Developed by Committee: E08
Pages: 166–178
DOI: 10.1520/STP38838S
ISBN-EB: 978-0-8031-5576-3
ISBN-13: 978-0-8031-5528-2