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Coupling damage based lifetime prediction of in-phase thermomechanical fatigue in nickel-based single crystal superalloys
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1.Beihang University;2.School of Energy and Power Engineering,Beihang University

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    Abstract:

    Based on the in-phase thermomechanical fatigue experiments under stress control, the damage mechanism of in-phase thermomechanical fatigue of DD6 superalloy is investigated. Based on the continuous damage mechanics, a lifetime prediction model reflecting the coupling of creep damage and fatigue damage is established, and the damage parameters in the model are obtained through using the experiment data of creep and fatigue. Furthermore, the experiments of in-phase thermomechanical fatigue with dwells of DD6 superalloy are conducted in this paper, and the experiment lifetimes are within a factor of 2.3 of the prediction lifetimes based on the coupling damage, which indicates that the coupling damage based lifetime prediction model developed in this paper could accurately predict the in-phase thermomechanical fatigue lifetimes of DD6 superalloy and provide a basis for the lifetime prediction of DD6 superalloy structure in engineering applications.

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[Zhang Bin, Wang Rongqiao, Hu Dianyin, Jiang Kanghe, Mao Jianxing, Jing Fulei. Coupling damage based lifetime prediction of in-phase thermomechanical fatigue in nickel-based single crystal superalloys[J]. Rare Metal Materials and Engineering,2019,48(12):3889~3894.]
DOI:10.12442/j. issn.1002-185X.20180846

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History
  • Received:August 06,2018
  • Revised:August 28,2018
  • Adopted:August 31,2018
  • Online: January 07,2020
  • Published: