Grain-boundary precipitation in Allvac 718Plus

Pickering, Ed; Mathur, Harshal N.; Bhowmik, Ayan; Messé, O.M.D.M.; Barnard, J. S.; Hardy, MC; Krakow, Robert; Loehnert, K.; Stone, H.J.; Rae, C.M.F.

doi:10.1016/j.actamat.2012.01.042

Cited by 168 publications

(119 citation statements)

References 25 publications

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“…In the case of the SESF, the segregant atoms show a distinct preference for certain sublattice sites within the stacking fault. The resulting grid-like arrangement of the bright atomic columns is very similar to that seen in the ordered η phase in the alloy Allvac 718Plus that has the same -ABACA-stacking as the five layers at the centre of the SESF [33]. This clear structure provides further evidence that the diffusive reordering scheme put forward by Kovarik et al [14,16] is necessary for the propagation of the fault.…”

Section: Discussionsupporting

confidence: 59%

High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal

Vorontsov¹,

et al. 2012

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Section: Discussionsupporting

confidence: 59%

High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal

Vorontsov¹,

et al. 2012

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“…It has been suggested that this configuration serves to accommodate local compositional variations, and that the ratio between the two phases could depend on the thermomechanical history of the material [15,16]. However, η appears to be the main constituent in the majority of precipitates, while the δ layers, sometimes only a few atomic layers thick, can only be detected using highresolution techniques.…”

Section: Grain Boundary Precipitation In 718plusmentioning

confidence: 99%

“…They were initially identified as δ-phase (Ni 3 Nb, D0 a , orthorhombic) as in alloy 718 [6,10,11]. While some early reports by Xie et al indicated the presence of a hexagonal phase in 718Plus [12][13][14] 24 , hexagonal) interleaved with layers of δ [15].…”

Section: Grain Boundary Precipitation In 718plusmentioning

confidence: 99%

Evolution of secondary phases in alloy ATI 718Plus^®during processing

Casanova

Martín-Piris

Hardy

et al. 2014

MATEC Web of Conferences

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Abstract. ATI 718Plus R is a polycrystalline Ni-base superalloy for aero-engine disc applications, which relies on the precipitation of η-phase (Ni 6 Nb[Al,Ti], D0 24 ) at grain boundaries for resistance to intergranular failure and grain size control. The nucleation and evolution of the η particles have been examined throughout the manufacturing process. During hot working below the η solvus, existing precipitates lose their orientation relationship with the matrix and become aligned with the forging flow. During heat treatment, a dual morphology develops by the uniform growth of those incoherent precipitates into coarse plates, together with the new nucleation of thin lamellae from selected grain boundaries. The balance between the two morphologies in the final component can be achieved by controlling precipitation and dissolution processes during forging.

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“…The changes of volume fraction and morphology of secondary phases have to be considered as well, e.g. -phase for IN718, -phase for ATI 718Plus ® [12,17]. Fig.…”

Section: Discussionmentioning

confidence: 99%

“…This study uses one of the modified JMAK type models for simulating recrystallisation during the hot extrusion process [11]. An initial attempt to take into account the influence of the -phase [12] on recrystallisation was made by Sommitsch and Huber [11,13]. The model allows the estimation of the volume fraction as well as average grain size of the recrystallised material during the deformation process.…”

Section: Introductionmentioning

confidence: 99%