Fatigue Crack-Growth Rates of Nickel-Based GH4742 Superalloy

We study the fatigue crack-growth behavior in the near-threshold region, middle section of the diagram, and high-amplitude region depending on the rates for the nickel-based GH4742 superalloy in tension with various stress ratios. The curves of fatigue crack growth rates are presented (from 10 –7 to...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2019-03, Vol.54 (5), p.685-689
Main Authors: Liu, H. G., Long, W., Li, Y. Y.
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion (Chemistry)
Crack propagation
Fatigue (Materials)
Fatigue failure
Fracture mechanics
Materials Science
Nickel (Metal)
Nickel base alloys
Oxidation-reduction reactions
Production management
Solid Mechanics
Stress intensity factors
Structural Materials
Superalloys
Turbines
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Summary:We study the fatigue crack-growth behavior in the near-threshold region, middle section of the diagram, and high-amplitude region depending on the rates for the nickel-based GH4742 superalloy in tension with various stress ratios. The curves of fatigue crack growth rates are presented (from 10 –7 to 10 –2 mm/cycle). By using the presented dependences, we determine the characteristics of fatigue crack-growth resistance of GH4742 alloy and reveal a significant decrease in the value of the critical stress intensity factor as the stress ratios increase.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-019-00233-y