Anisotropy in cyclic behavior and fatigue crack growth of IN718 processed by laser powder bed fusion

prost, mélanie; Köster, Alain; Missoum-Benziane, Djamel; Dépinoy, Sylvain; Ferhat, Lyliat; Rambaudon, Matthieu; Maurel, Vincent

doi:10.1016/j.addma.2022.103301

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…Prost et al showed that the growth rate of fatigue cracks in PBF‐LB/IN718 seems to be mainly determined by the crystallographic texture. [ 43 ] They observed a higher fatigue crack growth rate in a variant with

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orientation than in a more isotropic material (test condition: loading parallel to BD, z , notch orientation orthogonal to z ; T = 550 °C). They observed transgranular crack growth under those test conditions and point out that the crack growth mechanism strongly depends on the microstructure.…”

Section: Resultsmentioning

confidence: 99%

Tensile and Low‐Cycle Fatigue Behavior of Laser Powder Bed Fused Inconel 718 at Room and High Temperature

Sonntag,

Piesker,

Ávila Calderón

et al. 2024

Adv Eng Mater

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This study investigates the room‐ and high‐temperature (650 °C) tensile and low‐cycle fatigue behavior of Inconel 718 produced by laser powder bed fusion (PBF‐LB/M) with a four‐step heat treatment and compares the results to the conventional wrought material. The microstructure after heat treatment is characterized on different length scales. Compared to the wrought variant, the elastic and yield properties are comparable at both test temperatures while tensile strength, ductility, and strain hardening capacity are lower. The fatigue life of the PBF‐LB/M variant at room temperature is slightly lower than that of the wrought material, while at 650 °C, it is vice versa. The cyclic stress response for both material variants is characterized by cyclic softening, which is more pronounced at the higher test temperature. High strain amplitudes (≥ 0.7 %) at room temperature and especially a high testing temperature result in the formation of multiple secondary cracks at the transitions of regions comprised of predominantly elongated grain morphology and of columns of stacked grains with ripple patterns in the PBF‐LB/M material. This observation and pronounced crack branching and deflection indicate that the cracks are controlled by sharp micromechanical gradients and local 〈001〉 crystallite clusters.This article is protected by copyright. All rights reserved.

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