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000645115 1001_ $$0P:(DE-H253)PIP1103665$$aCipriano Farias, Francisco Werley$$b0$$eCorresponding author
000645115 245__ $$aInconel 718 fabricated via arc-based directed energy deposition assisted with in situ interlayer hot forging
000645115 260__ $$aAmsterdam$$bElsevier$$c2025
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000645115 520__ $$aNi-based superalloys fabricated by arc-based directed energy deposition (DED) typically exhibit a non-optimizedmicrostructure, characterized by coarse and oriented columnar grains, which limits their performance and in-dustrial applications. In this context, microstructure refinement techniques previously applied to arc-basedwelding have been tested in additive manufacturing, highlighting interlayer mechanical deformation methods(e.g., rolling and peening). The present work describes the grain size refinement mechanism of in situ interlayerhot forging (HF) and evaluates its effect on the elevated-temperature tensile behavior of Inconel 718 fabricatedvia DED (IN718 DED). HF induced a dynamically recrystallized zone (~1 mm) on the top layer surface and adeformed zone (~0.5 mm) immediately beneath it, which was not completely remelted by the subsequent layerdeposition, thereby generating recrystallized grains during subsequent multiple thermal cycles. During the ho-mogenization heat treatment, the remaining deformed region recrystallized, generating a finer grain size and analmost equiaxed microstructure. HF also improves the yield strength at elevated-temperatures and induces analmost isotropic behavior. For the first time, enabling the IN718 DED to meet the grain size, elongation, andelevated-temperature yield strength requirements (AMS 5662).
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000645115 7001_ $$0P:(DE-HGF)0$$aDuarte, Valdemar Rebelo$$b1
000645115 7001_ $$00000-0002-5296-8537$$ada Cruz Payão Filho, João$$b2
000645115 7001_ $$0P:(DE-H253)PIP1005745$$aSchell, Norbert$$b3
000645115 7001_ $$0P:(DE-H253)PIP1008506$$aMaawad, Emad$$b4
000645115 7001_ $$0P:(DE-H253)PIP1015660$$aCormier, Jonathan$$b5
000645115 7001_ $$0P:(DE-HGF)0$$ada Fonseca, Fabio Machado Alves$$b6
000645115 7001_ $$0P:(DE-HGF)0$$aRamirez, Antonio J.$$b7
000645115 7001_ $$0P:(DE-HGF)0$$ados Santos, Telmo Jorge Gomes$$b8
000645115 7001_ $$0P:(DE-H253)PIP1018061$$aOliveira, J. P.$$b9$$eCorresponding author
000645115 773__ $$0PERI:(DE-600)2012154-4$$a10.1016/j.msea.2025.149269$$gVol. 948, p. 149269 -$$p149269 $$tMaterials science & engineering / A$$v948$$x0921-5093$$y2025
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