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Experimental study of the strengthening effect of low amplitude loading history for a P/M nickel-based superalloy FGH96
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  • Xiaoguang YANG,
  • RenJie Jiang,
  • Duoqi SHI,
  • Muwei Cheng,
  • Yantao Sun
Xiaoguang YANG
Beihang University School of Energy and Power Engineering

Corresponding Author:[email protected]

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RenJie Jiang
Beihang University School of Energy and Power Engineering
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Duoqi SHI
Beihang University School of Energy and Power Engineering
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Muwei Cheng
Beihang University School of Energy and Power Engineering
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Yantao Sun
AVIC Beijing Aeronautical Manufacturing Technology Research Institute
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Abstract

The influence of preloading on the residual fatigue life of nickel-based superalloys under elevated temperatures was investigated experimentally. A powder metallurgy nickel-based superalloy FGH96 was preloaded with different number of cycles, and the residual fatigue life was tested under subsequent high-amplitude loads. The test results show that the fatigue life of the material was increased when the preloading cycle number was within a specific range. At the same time, the fatigue life of virgin specimens under high-amplitude loads shows little scatter, which provides the possibility to consider the strengthening effect of low-amplitude loads. A novel damage accumulation model was proposed to incorporate the strengthening effect of low-amplitude loads into the life prediction framework. The proposed model provides better life prediction than some existing models. Finally, the proposed model was validated using experimental data for various materials under the low-high loading sequence.
14 Mar 2023Submitted to Fatigue & Fracture of Engineering Materials & Structures
14 Mar 2023Submission Checks Completed
14 Mar 2023Assigned to Editor
18 Mar 2023Reviewer(s) Assigned
18 Apr 2023Review(s) Completed, Editorial Evaluation Pending
08 May 2023Editorial Decision: Revise Major
05 Jul 20231st Revision Received
05 Jul 2023Submission Checks Completed
05 Jul 2023Assigned to Editor
09 Jul 2023Reviewer(s) Assigned
22 Jul 2023Review(s) Completed, Editorial Evaluation Pending
23 Jul 2023Editorial Decision: Revise Minor
27 Jul 20232nd Revision Received
27 Jul 2023Submission Checks Completed
27 Jul 2023Assigned to Editor
27 Jul 2023Review(s) Completed, Editorial Evaluation Pending
01 Aug 2023Editorial Decision: Accept