The limit of hot isostatic pressing for healing cracks present in an additively manufactured nickel superalloy

Vilanova, M.; Garciandía, Fermín; Sainz, S.; Jorge-Badiola, D.; Guraya, Teresa; Sebastián, María San

doi:10.1016/j.jmatprotec.2021.117398

Cited by 18 publications

(2 citation statements)

References 43 publications

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“…The characteristic microstructure of HEAs prepared by LPBF processes consists of molten pool tracks and substructures, which disappeared completely after HIP treatment. Dislocation substructures are commonly observed in LPBF-processed alloys and may annihilate after heat treatment [37][38][39] . Actually, the alloy composition at the molten pool/substructure boundary was slightly different from that inside the molten pool/substructure.…”

Section: Microstructural Evolution During Hip Treatmentmentioning

confidence: 99%

“…According to practice, the interaction between dislocations and the hard B2 phase can be interpreted by the Orowan bypass mechanism, while the L1 2 nanophase plays a role mainly through the dislocation shear mechanism. It is worth noting that the inhomogeneous deformation (i.e., strain gradient) caused by microstructure heterogeneity produces microscale residual stress and associated back stress, which may provide additional strengthening and strain hardening [39] . During the tensile deformation process, the plastic deformation is first borne by the softer FCC phase, resulting in dislocation accumulation and back stress strengthening at the heterogeneous interface between the FCC and B2 phases, which is why the alloy exhibits high strength characteristics [41] .…”

Section: Deformation Mechanismmentioning

confidence: 99%

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Hot isostatic pressing induced precipitation strengthening at room and high temperature of Ni-Fe-Cr-Al-V high-entropy alloy manufactured by laser powder bed fusion

Ziwei,

Zhen,

Zheng

et al. 2024

Microstructures

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The highly adjustable properties of high-entropy alloys (HEAs) offer great potential for developing superior materials for critical structural applications in high-temperature conditions. In this study, Ni-Fe-Cr-Al-V HEA was manufactured by laser powder bed fusion, which has a unique microstructure composed of dislocation substructure and Face-centered cubic + L12 coherent structure and achieves the desired strength-ductility combination. Hot isostatic pressing post-treatment was applied on the laser powder bed fusion-processed HEA to further improve the relative density and optimize the mechanical properties. During the hot isostatic pressing process, the precipitation of L12 and B2 phases can be ascribed to the precipitation modes dominated by continuous precipitation and discontinuous precipitation, respectively. With the tensile deformation temperature increasing from 773-1,173 K, the softening degree of HEA increases continuously, and the dominant deformation mechanism evolves from intragranular dislocation slip to grain boundary sliding. At temperatures below 773 K, precipitation strengthening significantly improves tensile strength and ductility. At 1,173 K, the grain boundary strength decreases and grain boundary area increases, which promotes grain boundary sliding and contributes to plastic deformation, resulting in significant softening.

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Section: Microstructural Evolution During Hip Treatmentmentioning

confidence: 99%

Section: Deformation Mechanismmentioning

confidence: 99%