Slip transfer across grain/twin boundaries in polycrystalline Ni-based superalloys

Genée, Julien; Signor, Loïc; Villechaise, Patrick

doi:10.1016/j.msea.2017.06.072

Cited by 43 publications

(6 citation statements)

References 39 publications

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“…Yet such initiation mechanisms do not necessarily show better endurance limit 28,29 . Hence, the microstructure and grain boundaries present have an impact on initiation too 30 …”

Section: Introductionmentioning

confidence: 99%

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

Martin

Hor

Copin

et al. 2022

Fatigue Fract Eng Mat Struct

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Laser‐based powder bed fusion (LPBF) is attractive to build complex parts in spite of the low machinability of Inconel 625. The LPBF microstructures and tensile properties are well documented in literature. But fatigue properties and impact of the LPBF intrinsic defects and microstructures on the crack initiation and propagation mechanisms are uncommon. Low and high‐cycle fatigue tests at room and service temperature presented in this paper prove that the LPBF defects shorten the crack initiation stage. After annealing heat treatment, the microstructure adapts to the defects, and the fatigue response becomes similar to a free defect material. The fatigue life of as‐built Inconel 625 is lower than 50% of its monotonic yield tensile strength (YTS) while the annealed material reaches 100% of its YTS. The propagation rate is slowed by the homogeneous annealed microstructure and improved ductility resulting from removal of dislocation cells and changes in grain morphology.

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“…Yet such initiation mechanisms do not necessarily show better endurance limit 28,29 . Hence, the microstructure and grain boundaries present have an impact on initiation too 30 …”

Section: Introductionmentioning

confidence: 99%

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

Martin

Hor

Copin

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Therefore, both a small twist angle, α, and a small angle between the incoming and outgoing slip directions, δ, are key determining the crack path across GBs. Interestingly, both are geometrical parameters associated with easy slip transmission across GBs [23]. Therefore, the results allow concluding that crack propagation in stage-I is facilitated by slip transmission, as schematically illustrated in figure 4c.…”

mentioning

confidence: 60%

The role of slip transfer at grain boundaries in the propagation of microstructurally short fatigue cracks in Ni-based superalloys

et al. 2019

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Crack initiation and propagation under high-cycle fatigue conditions have been investigated for a polycrystalline Ni-based superalloy by in-situ synchrotron assisted diffraction and phase contrast tomography. The cracks nucleated along the longest coherent twin boundaries pre-existing on the specimen surface, that were well oriented for slip and that presented a large elastic incompatibility across them. Moreover, the propagation of microstructurally short cracks was found to be determined by the easy slip transfer paths across the pre-existing grain boundaries. This information can only be obtained by characterization techniques like the ones presented here that provide the full set of 3D microstructural information.

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“…In some cases, the impingement of the slip traces on a GB leads to the formation of micro-volumes of deformation (Fig. 2e), which appear due to a high density of dislocations, local crystalline rotations and/or grain boundary shearing, and also indicate that slip transfer is not possible [21] .…”

Section: Resultsmentioning

confidence: 99%

Criteria for slip transfer across grain and twin boundaries in pure Ni

Nieto-Valeiras¹,

LLorca²

2022

Preprint

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Slip transfer at grain boundaries and annealing twin boundaries was studied in polycrystalline Ni by means of slip trace analysis. Slip transfer or blocking was assessed in > 200 boundaries and was related with geometrical criteria that establish the alignment between the active slip systems across the boundaries. It was found that slip transfer mainly occurs at low-angle regular grain boundaries and that a Luster-Morris parameter > 0.8 stands for the best criterion to assess slip transfer. In the case of coherent or incoherent twin boundaries, slip transfer occurs when the residual Burgers vector is close to zero through dislocation cross-slip.

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Slip transfer across grain/twin boundaries in polycrystalline Ni-based superalloys

Cited by 43 publications

References 39 publications

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

Impact of annealing treatment on the fatigue behavior of Inconel 625 produced by laser‐based powder bed fusion

The role of slip transfer at grain boundaries in the propagation of microstructurally short fatigue cracks in Ni-based superalloys

Criteria for slip transfer across grain and twin boundaries in pure Ni

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