Effects of altered hot isostatic pressing treatments on the microstructures and mechanical performance of electron beam melted Ti-6Al-4V

Ahmad Abu-Issa; Miguel Lopez; Christina Pickett; Andres Escarcega; Edel Arrieta; Lawrence E. Murr; Ryan B. Wicker; Magnus Ahlfors; Don Godfrey; Francisco Medina

Journal of Materials Research and Technology (Jul 2020)

Effects of altered hot isostatic pressing treatments on the microstructures and mechanical performance of electron beam melted Ti-6Al-4V

Ahmad Abu-Issa,
Miguel Lopez,
Christina Pickett,
Andres Escarcega,
Edel Arrieta,
Lawrence E. Murr,
Ryan B. Wicker,
Magnus Ahlfors,
Don Godfrey,
Francisco Medina

Affiliations

Ahmad Abu-Issa: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA; Corresponding author at: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA.
Miguel Lopez: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA
Christina Pickett: W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA; Department of Metallurgical, Materials and Biomedical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA
Andres Escarcega: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA
Edel Arrieta: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA
Lawrence E. Murr: W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA; Department of Metallurgical, Materials and Biomedical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA
Ryan B. Wicker: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA
Magnus Ahlfors: Quintus Technologies, Lewis Center, OH 43035, USA
Don Godfrey: Honeywell Aerospace, Phoenix, AZ 85034, USA
Francisco Medina: Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA; W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA

Journal volume & issue: Vol. 9, no. 4
pp. 8735 – 8743

Abstract

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A wide range of post process hot isostatic pressing (HIP) studies of electron beam additively manufactured Ti-6Al-4V in this research program have shown that cooling rates of 103 °C/min from temperatures above and below the beta transus produced acicular alpha-prime martensite characteristic elongations < 10%. Optimum yield strength (0.9 GPa), UTS (1.0 GPa), and elongation (∼14%) were achieved for slow cooling (at 102 °C/min) from 850 °C HIP which produced a dense, Widmanstatten alpha structure within the retained, as-fabricated columnar grains by alpha-prime decomposition. These results suggest that manipulation of AM process parameters to produce a small-grain, equiaxed microstructure, HIPed below the beta transus and slow cooled, will have a wide range of superior, isotropic mechanical properties corresponding to a Widmanstatten alpha microstructure within the equiaxed grains.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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