Nucleation mechanism of hetero-epitaxial recrystallization in wrought nickel-based superalloys

Katnagallu, Shyam; Vernier, Suzanne; Charpagne, Marie-Agathe; Gault, Baptiste; Bozzolo, Nathalie; Kontis, Paraskevas

doi:10.1016/j.scriptamat.2020.09.012

Cited by 28 publications

(9 citation statements)

References 31 publications

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“…As for preferential crack initiation at the primary γ' particles, a fundamental reason could be that they are in most cases only partially coherent with their surrounding grains. Besides, depending on the forging conditions, they can also be surrounded by a ductile γ-shell depleted of fine strengthening γ' precipitates, as previously reported by Charpagne et al [51][52][53] . Such a lack of coherence of primary γ'particles interfaces, and a possible very narrow precipitate-free zone in their immediate vicinity, are likely to favour preferred damage development in dynamic conditions.…”

Section: Post-recovery Observationssupporting

confidence: 64%

Dynamic response of wrought and additively manufactured nickel-based alloys to high velocity impacts of laser-launched flyers

Barraud

Rességuier

Baillargeat

et al. 2022

Journal of Applied Physics

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Although nickel-based superalloys are widely used in the industry, their response to shock loading is still rarely investigated. Here, the impacts of laser-launched flyers were used to study the dynamic behavior of a Rene 65 superalloy under shock pressures of about 10 GPa at very high strain rates of about 106 s−1. Three types of samples, wrought or additively manufactured (laser powder bed fusion) and subjected to different heat treatment conditions, were investigated. These experiments allowed the measurement of the Hugoniot elastic limit (compressive yield strength) and the spall (tensile) strength, both in upper ranges compared with the most common metals. Post-recovery analyses involving various techniques provided insight into dynamic failure with a combination of transgranular ductile fracture and intergranular cracks with preferential nucleation sites, strongly dependent on the different microstructures related to fabrication routes and thermal treatments.

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Section: Post-recovery Observationssupporting

confidence: 64%

Dynamic response of wrought and additively manufactured nickel-based alloys to high velocity impacts of laser-launched flyers

Barraud

Rességuier

Baillargeat

et al. 2022

Journal of Applied Physics

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“…However, on AD730, no grain size change was observed since 1253 K was too low a temperature to induce any grain growth or recrystallization. [43,44] As shown in Figures 2 and 3, in addition to grain size, different types of secondary phases precipitated after PWHT in different regions. Figure 3 shows the evolution of the shape, location, and volume fraction (V f ) of the d phase in IN718 alloy (W1-STA) from the BM zone to the WZ.…”

Section: Microhardness Testmentioning

confidence: 97%

Post-Weld Heat Treatment of Additively Manufactured Inconel 718 Welded to Forged Ni-Based Superalloy AD730 by Linear Friction Welding

Tabaie

Rézaï-Aria

Flipo

et al. 2021

Metall Mater Trans A

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A new post-weld heat treatment (PWHT) cycle was designed for novel dissimilar linear friction welding (LFW) of selective laser melted (SLM) Inconel 718 (IN718) to AD730 forged nickel-based superalloy. The microstructure and hardness of the joints after the PWHT are investigated and compared with those of as-linear friction welded samples. The precipitation of c¢ + c¢¢ is determined as the main mechanism to increase the mechanical properties of SLM IN718 alloy. These particles coarsened during heat treatment at 1253 K and double aging. The results show that the thermomechanical history of linear friction welded joints can affect the microstructure of IN718 alloy such as the morphology of d phase after solution treatment (ST) from the platelike in the weld zone (WZ) to the needlelike in the base material (BM). It was found that in AD730, nanometric size c¢ particles reprecipitated close to the weld line during rapid cooling after welding. The presence of ultrafine c¢ particles and coarsening of the remaining particles in the microstructure of the alloy, during PWHT, can enhance the strength and hardness. The developed PWHT resulted in uniform hardness across the new dissimilar joint.

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“…Incorporating the observations of Charpagne, the most recent theory of HERX initiation is presented in a study from 2021. Here, Katnagallu et al [34] propose prior forging causes the formation of dislocation arrays at the interface of the primary γ . Then during heat treatment, dislocations act as pathways for enhanced diffusion.…”

Section: Initiation Mechanism Of Herxmentioning

confidence: 99%

“…One study investigating the composition of the shell has suggested that significantly higher tungsten (W) content of the shell compared to the matrix could explain this [23]. However, a more recent study has observed similar growth in HERX shells without any W [34]. Hence the presence of W is unlikely to account for the difference in stored energy.…”

Section: Growth Mechanism Of Herxmentioning

confidence: 99%

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A review of microstructure phenomena during manufacture of polycrystalline Ni-based superalloys

Galpin

2022

Materials Science and Technology

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The effects of manufacturing conditions on the microstructure evolution of Ni-based superalloys are poorly understood, and the interchangeable terminology to describe some microstructure phenomena is inconsistent. This critical review aimed to address these issues through the discussion of seven microstructure phenomena that occur during thermomechanical processing of safety-critical components used in jet engines. Each phenomenon is outlined with reference to grain nucleation and growth mechanisms, as well as processing conditions under which they are observed. The processing conditions where each phenomenon dominates are visualised through a series of contour plots. Through this graphical representation, gaps of understanding in microstructure evolution were identified and accompanied by recommendations for areas of further study.

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Nucleation mechanism of hetero-epitaxial recrystallization in wrought nickel-based superalloys

Cited by 28 publications

References 31 publications

Dynamic response of wrought and additively manufactured nickel-based alloys to high velocity impacts of laser-launched flyers

Dynamic response of wrought and additively manufactured nickel-based alloys to high velocity impacts of laser-launched flyers

Post-Weld Heat Treatment of Additively Manufactured Inconel 718 Welded to Forged Ni-Based Superalloy AD730 by Linear Friction Welding

A review of microstructure phenomena during manufacture of polycrystalline Ni-based superalloys

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