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The effect of heat treatment on tensile yielding response of the new superalloy ABD-900AM for additive manufacturing

DOI: 10.1007/978-3-030-51834-9_103 DOI Help

Authors: Yuanbo Tang (University of Oxford) , Joseph N. Ghoussoub (University of Oxford) , Chinnapat Panwisawas (University of Oxford) , David M. Collins (University of Oxford) , Sajjad Amirkhanlou (OxMet Technologies) , John W. G. Clark (OxMet Technologies) , André A. N. Németh (OxMet Technologies) , D. Graham Mccartney (University of Nottingham) , Roger C. Reed (University of Oxford)
Co-authored by industrial partner: No

Type: Book Chapter

State: Published (Approved)
Published: August 2020
Diamond Proposal Number(s): 23674

Abstract: The heat treatment response of the new superalloy ABD-900AM, designed specifically for additive manufacturing (AM), is studied. The as-fabricated microstructure is characterised at multiple length-scales including by X-ray synchrotron diffractometry and transmission Kikuchi diffraction imaging. The very high cooling rates arising during the process suppress γ′ precipitation; thus the details of heat treatment are shown to be important in establishing properties. The yield stress and tensile strength developed are marginally improved by super-solvus rather than sub-solvus heat treatment, but the ductility is then compromised. The tensile behaviour is superior to the heritage alloy IN939 which has a comparable fraction of γ′; this is due to the larger refractory content of ABD-900AM and its finer scale precipitation. The internal strains developed during processing are sufficient to promote recrystallization during super-solvus heat treatment which breaks down microstructural anisotropy and promotes grain growth; however, this effect is absent for the sub-solvus case.

Journal Keywords: Additive manufacturing; Ni-based superalloy; HR-TKD/FSE; Tensile yielding; Recrystallization; Synchrotron

Subject Areas: Materials, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

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