Volume 40 Issue 11
Nov.  2025
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SUN Chuanwen, SUN Rui, LI Wei. Fatigue properties and life prediction of additive manufacturing and solution aging Inconel 718[J]. Journal of Aerospace Power, 2025, 40(11):20240570 doi: 10.13224/j.cnki.jasp.20240570
Citation: SUN Chuanwen, SUN Rui, LI Wei. Fatigue properties and life prediction of additive manufacturing and solution aging Inconel 718[J]. Journal of Aerospace Power, 2025, 40(11):20240570 doi: 10.13224/j.cnki.jasp.20240570

Fatigue properties and life prediction of additive manufacturing and solution aging Inconel 718

doi: 10.13224/j.cnki.jasp.20240570
  • Received Date: 2024-08-16
    Available Online: 2025-05-15
  • To investigate the fatigue properties of nickel-based alloy fabricated by additive manufacturing and heat treatment as standard in the aerospace field, the microstructural tests, tensile tests, and high-cycle and very high-cycle fatigue tests at stress ratios R=−1 and 0.1 were carried out on as-built and solution aging specimens. The test results showed that the tensile and fatigue properties of the additive manufactured nickel-based alloy were significantly improved after solution aging treatment. Surface failure was the main fatigue failure mode of additive manufactured nickel-based alloy at room temperature. The location of crack nucleation could be shifted from the surface of the material to the interior at the long-life regime of R=0.1. The improvement of tensile and fatigue properties was mainly attributed to the precipitation of γ′, γ″ and δ phases. Under the synergistic effects of these strengthening phases, the matrix was significantly strengthened, dislocation movement was inhibited and crack growth was hindered. Defects and incompatible local grain orientation can lead to internal crack nucleation. Microcracks in the internal crack nucleation area propagated under shear force in a grain transgranular manner, and the grains fracked to form facets. Based on the self-strain energy theory, a life prediction method was proposed, and the prediction results were in good agreement with the test results.

     

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