Fatigue and fracture behavior of nickel-based superalloy Inconel 718 up to the very high cycle regime |
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| Authors: | Xian-feng Ma Zheng Duan Hui-ji Shi Ryosuke Murai and Eiichi Yanagisawa |
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| Institution: | (1) NASA Glenn Research Center, 21000 Brookpark Rd., Cleveland, OH 44135, USA;(2) GE Aviation, 1 Neumann Way, Cincinnati, OH 45215, USA;(3) GE Aviation, 1000 Western Ave., Lynn, MA 01910, USA |
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| Abstract: | The fatigue and fracture behavior of nickel-based superalloy Inconel 718 was investigated up to the very high cycle regime
under rotary bending tests at room temperature. It was found that this superalloy can still fracture after exceeding 107 cycles. Fractographic analysis revealed that there was a transition from fatigue crack initiation at multi-sites to single
initiation with decreasing stress levels. The fracture surface can be divided into four areas according to the appearance,
associated with fracture mechanics analysis of the corresponding stress intensity factors. The fracture mechanism dominant
in each area was disclosed by scanning electron microscope examination and analyzed in comparison with those obtained from
the crack growth tests. Subsequently, life prediction modeling was proposed by estimating the crack initiation and propagation
stage respectively. It was found that Chan (2003)’s model for initiation life and the Paris law for growth life can provide
comparable predictions against the experimental life. |
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| Keywords: | Nickel-based superalloy High cycle fatigue （HCF） Fatigue crack initiation Crack growth Life prediction |
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