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| Characterization, evaluation and expectation of fatigue damage behavior for series PM nickel-based superalloys (FGHxx) |
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Abstract Series powder metallurgy (P/M) nickel-based superalloys (FGHxx) are one of main high temperature structures materials as Chinese damage tolerance P/M superalloys which consisted of FGH95, FGH96 and FGH97 etc.. It is the primary purpose that the service temperature strength, fracture toughness and resistances of fatigue cracking behaviors of P/M superalloys can be effectively enhanced in lower cost through the optimization of the processing parameters including the powder size or other parameters. In this article, the microstructure characteristics, fatigue data scatter peculiarity in S-N curves, fatigue crack initiation and propagation behavior, SEM in-situ testing technology, predication models of fatigue life, fatigue limit, notch factor Kt of 3D K-T diagram were established. And the relative influence factors of series FGHxx superalloys were analyzed and discussed in detail based on the research status including our latest findings.
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Received: 08 December 2021
Published: 12 October 2022
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2022, Vol. 43 
