Effect of heat treatment on the modification of microstructure of selective laser melted (SLM) IN718 and its consequences on mechanical behavior

Vikram, RJ and Singh, A and Suwas, S (2020) Effect of heat treatment on the modification of microstructure of selective laser melted (SLM) IN718 and its consequences on mechanical behavior. In: Journal of Materials Research, 35 (15).

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Abstract

In this investigation, the superalloy IN718 has been prepared by additive manufacturing (AM) following a selective laser melting technique, and the post-AM heat treatments have been optimized. The microstructure of additively manufactured (AM) IN718 is characterized by the presence of dendritic and cellular features with large spatial heterogeneity along and across the build plane. Along the build direction, the 100 fiber texture dominates. Heat treatment involving two-step solution treatment, and subsequently, two-step aging treatment was specifically designed to facilitate the precipitation of δphase at the grain boundaries to make the material resistant to grain boundary sliding (GBS). The AM IN718 showed dynamic strain aging (DSA) at three different temperatures, while the critical strain for the onset of serration was extended to a higher value after the heat treatment. Copyright © Materials Research Society 2020.

Item Type:	Journal Article
Publication:	Journal of Materials Research
Publisher:	Cambridge University Press
Additional Information:	The copyrights for this article belongs to the publishers.
Keywords:	Additives; Grain boundary sliding; Light modulators; Selective laser melting; Textures, Build direction; Critical strains; Dynamic strain aging; Effect of heat treatments; Grain-boundary slidings; Mechanical behavior; Spatial heterogeneity; Two-step solution treatment, Heat treatment
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	24 Dec 2024 11:41
Last Modified:	24 Dec 2024 11:41
URI:	http://eprints.iisc.ac.in/id/eprint/65992

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