Characterization of the Initial Stages of Dynamic Recrystallization in ATI 718Plus®

Kienl, Christiane; Casanova, A.; Messé, O.M.D.M.; Argyrakis, C.; Rae, C.M.F.

doi:10.1007/978-3-319-89480-5_25

Cited by 5 publications

(4 citation statements)

References 28 publications

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“…The fact that PDRX could occur during the quenching after high strain rate deformation was actually suggested earlier by Zhou et al [29] and was proposed as one possible explanation of the differences between their results and microstructural evolutions reported by Camus et al in [46]. The same hypothesis was proposed more recently by Kienl et al [47], also to justify the increase in the recrystallized fraction with increasing strain rate in ATI 718Plus® samples quenched after deformation. A deeper study of the PDRX kinetics dependence on strain rate will be carried out in section 2.3 in order to confirm this interpretation of the above-presented results.…”

Section: Drx Kinetics Assessed From Samples Water Quenched Right After Deformationsupporting

confidence: 55%

Influence of strain rate on subsolvus dynamic and post-dynamic recrystallization kinetics of Inconel 718

et al. 2019

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Influence of strain rate on dynamic and post-dynamic recrystallization kinetics of Inconel 718 is investigated by performing hot compression tests at constant strain rate in the range 0.001; 1 in the -subsolvus domain, with or without post-deformation holding at the deformation temperature. Dynamically and post-dynamically recrystallized grains are distinguished based on their internal misorientations, using EBSD data with enhanced angular resolution. For the applied deformation conditions ( = 980° and = 0.7), dynamic recrystallization is inhibited at > 0.1 . On the other hand, very fast post-dynamic recrystallization is promoted by high strain rates, with characteristic times which can be as short as few seconds to achieve full recrystallization. Most of previous works on the effect of strain rate on dynamic recrystallization kinetics were done by quenching samples right after deformation, without discriminating dynamically and post-dynamically recrystallized grains. Those works led to the conclusion that increasing strain rate beyond a critical value leads to an increase in dynamic recrystallization kinetics. Experimental quenching delays cannot be shorter that few seconds, which is shown here to be sufficient to get a significant increase in recrystallized fraction by post-dynamic mechanisms. Based on the present work, postdynamic evolutions are actually very likely to be responsible for the apparent increase in dynamic recrystallization kinetics at high strain rates which has often been reported previously.

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Section: Drx Kinetics Assessed From Samples Water Quenched Right After Deformationsupporting

confidence: 55%

Influence of strain rate on subsolvus dynamic and post-dynamic recrystallization kinetics of Inconel 718

et al. 2019

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“…The specimens deformed at 850 • C were only compressed to a strain of 1. A detailed description of the testing procedure can be found elsewhere [19]. Electron backscattered diffraction (EBSD) was used to obtain a general overview of the microstructure.…”

Section: Methodsmentioning

confidence: 99%

Deformation twinning during high temperature compression tests of the Ni-base superalloy ATI 718Plus®

2022

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This study discusses the deformation mechanisms active during high temperature compression tests of the Ni-base superalloy ATI 718Plus R . Deformation twins were observed in deformed grains across a range of temperatures and strain rates by use of transmission electron microscopes (TEM). Even at strain rates as low as 0.01 s −1 and temperatures up to 1025 • C the microstructure contained of grains which deformed by deformation twinning. It was concluded that the low stacking fault energy of the alloy, which was measured to be 15mJm −2 caused the formation of the deformation twins. In addition, several examples of the early stages of twin formation were captured. The twinning partials were in most cases emitted from grain boundaries. In a second instance cross-slip events from a Frank-Read source lead to the formation of partials which formed stacking faults.

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“…This can achieved through suppression of the γ′ solvus [56] or by altering the lattice parameters of the γ′. The lattice parameters are altered to augment the misfit between the γ and the γ′ in such a way as to reduce the driving force for precipitation [101,108,109]. In Allvac® 718Plus, the misfit of the γ′ was increased by additions of Nb to reduce susceptibility to cracking [110,111].…”

Section: Alloy Design For Hot Cracking Resistance In Additive Manufac...mentioning

confidence: 99%

“…In Allvac® 718Plus, the misfit of the γ′ was increased by additions of Nb to reduce susceptibility to cracking [110,111]. In these systems, the γ′ precipitation is relatively sluggish [63,109], however, this reduced the γ′ solvus which in turn limited the alloy to a service temperature near 700°C. These modifications can be used to design alloys which are less susceptible to cracking during AM [33,56].…”

Section: Alloy Design For Hot Cracking Resistance In Additive Manufac...mentioning

confidence: 99%

Applications of alloy design to cracking resistance of additively manufactured Ni-based alloys

Markanday

2022

Materials Science and Technology

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Utilisation of additive manufacturing (AM) for the fabrication of Ni-based alloys has seen a massive uptake in both academic and commercial institutions. However, processing of traditional Ni-based superalloys through AM has encountered numerous cracking issues. The primary forms of cracking include solidification, solid-state and liquation mechanisms. Many of these forms of cracking are influenced by the compositions, with certain Ni-based systems showing impressive resistance. The design of novel alloys systems specifically tuned for processing through AM might be necessary to realise the potential of these techniques. Recently, researchers have taken advantage of improved computational alloy design frameworks. These frameworks utilise methods such as neural networks to analyse massive volumes of data and predict compositions that might satisfy specific design criteria.

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Characterization of the Initial Stages of Dynamic Recrystallization in ATI 718Plus®

Cited by 5 publications

References 28 publications

Influence of strain rate on subsolvus dynamic and post-dynamic recrystallization kinetics of Inconel 718

Influence of strain rate on subsolvus dynamic and post-dynamic recrystallization kinetics of Inconel 718

Deformation twinning during high temperature compression tests of the Ni-base superalloy ATI 718Plus®

Applications of alloy design to cracking resistance of additively manufactured Ni-based alloys

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