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Very-High-Cycle-Fatigue Property of IN 718 Manufactured by Selective Laser Melting at Elevated Temperature: Microstructure-Related Failure Behavior and Life Prediction

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Abstract

The high- and very-high-cycle-fatigue properties of IN718 Ni-based superalloy manufactured by selective laser melting (SLM) were investigated by axially loaded fatigue tests at room temperature (25 °C) and elevated temperature (650 °C) with a stress ratio of R = −1. Due to the high energy density and rapid cooling rate of the SLM process, the grains grew as dendrites surrounded by chain and dotted Laves phases. Subsequently, the results of monotonic tensile tests show that the SLMed IN718 has good resistance to elevated temperature. The stress–life characteristic curves revealed a continuous decline with no conventional fatigue limit. The fracture observation illustrated that surface flaw-induced failure is predominant at 25 °C, while internal failure, caused by crystallographic facets cracking, is prevalent at 650 °C under lower stress. Furthermore, the internal failure mechanism related with microstructure was summarized. Based on the evaluation of stress intensity factor ranges, the threshold values of long and small crack growth can be obtained, as well as the transition lengths from small to long cracks can also be calculated. Finally, a model based on fatigue indicator parameter was proposed to predict the fatigue life, and the predicted results were acceptable.

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Acknowledgments

This work was supported by the Special Project for Seed-Innovation of NIN (grant number: ZZNR2202).

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Authors and Affiliations

  1. Refractory Materials Research Central, Northwest Institute for Non-Ferrous Metal Research, Xi’an, 710016, China

    Rui Sun, Wen Zhang, Hui Liu, Mingxing Xia, Run Bai, Xiaomei Cai, Feng Wang & Yongkang Zhou

  2. School of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Ping Hu

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  1. Rui Sun
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  2. Wen Zhang
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  3. Hui Liu
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Contributions

RS was involved in data curation, methodology, writing—original draft; WZ helped in supervision, writing—review & editing, funding acquisition; HL and YZ contributed to investigation; MX was involved in visualization; RB helped in formal analysis; XC contributed to data curation; FW helped in validation.

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Correspondence to Wen Zhang.

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Sun, R., Zhang, W., Liu, H. et al. Very-High-Cycle-Fatigue Property of IN 718 Manufactured by Selective Laser Melting at Elevated Temperature: Microstructure-Related Failure Behavior and Life Prediction. J. of Materi Eng and Perform 33, 4377–4391 (2024). https://doi.org/10.1007/s11665-023-08327-0

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