EFFECT OF HEAT TREATMENT ON STRUCTURE AND PROPERTIES OF LASER POWDER BED FUSION INCONEL 939

Kumar, EN and Athira, KS and Chatterjee, S and Srinivasan, D (2022) EFFECT OF HEAT TREATMENT ON STRUCTURE AND PROPERTIES OF LASER POWDER BED FUSION INCONEL 939. In: UNSPECIFIED.

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Abstract

Additive manufacturing of high gamma prime (γ�) Nickel-based superalloys are challenging due to their hot cracking tendency. This study comprises an understanding of microstructural evolution and mechanical properties of Inconel 939 (IN939) alloy processed via laser powder bed fusion (LPBF). The as-printed samples comprised of columnar grains along the build direction with a pronounced <100> texture resulting in ~17 lower elastic modulus along the build direction as compared to the builds in transverse orientation. The microstructure consists of cellular and columnar dendrites with segregation of Nb, Ta and Si in the inter-dendritic regions (decorating the cell boundaries). Occurrence of fine (< 50 nm) intra granular carbides in the as printed condition is a unique feature of this microstructure. Heat treatment resulted in dissolution of the dendritic microstructure with precipitation of semi-coherent γ�(Ni3(Al,Ti)) precipitates (150-200 nm) homogeneously from the matrix resulting in ~ 16 enhanced yield strength. The <100> texture is retained even after the solution and aging heat treatment indicating thermal stability of this structure. Copyright © 2022 by ASME.

Item Type:	Conference Paper
Publication:	Proceedings of 2022 International Additive Manufacturing Conference, IAM 2022
Publisher:	American Society of Mechanical Engineers
Additional Information:	The copyright for this article belongs to American Society of Mechanical Engineers.
Keywords:	3D printing; Additives; Carbides; Heat treatment; Microstructural evolution; Nickel alloys; Textures; Thermodynamic stability, Build direction; Effect of heat treatments; Gamma prime; Inconel; Inconel 939; Laser powder bed fusion; Laser powders; Nickel-based superalloys; Powder bed; Structures and properties, Superalloys
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Others
Date Deposited:	29 Apr 2024 08:07
Last Modified:	29 Apr 2024 08:07
URI:	https://eprints.iisc.ac.in/id/eprint/84408

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