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.
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Acknowledgements
The financial support of this work via the Innovate UK and OxMet Technologies Ltd is acknowledged by the authors. Y.T. Tang acknowledges Dr. Jack Haley on technical assistance of specimen preparation. The authors are grateful to Elements Materials Technologies for carrying out testing under ASTM standards. The authors also acknowledge beam time allocated to them under award MG23674 at the Diamond Light Source.
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Tang, Y.T. et al. (2020). The Effect of Heat Treatment on Tensile Yielding Response of the New Superalloy ABD-900AM for Additive Manufacturing. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_103
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DOI: https://doi.org/10.1007/978-3-030-51834-9_103
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