Campus Units

Materials Science and Engineering

Document Type

Article

Publication Version

Published Version

Publication Date

2017

Journal or Book Title

Acta Materialia

Volume

133

First Page

120

Last Page

133

DOI

10.1016/j.actamat.2017.05.025

Abstract

Advanced manufacturing approaches, including additive manufacturing (i.e., “3D printing”) of metallic structures requires a change to qualification strategies. One approach, informed qualification, integrates modeling strategies to make predictions of material characteristics, including the prediction of tensile properties for given chemistries and microstructures. In this work, constitutive equations are developed and presented that can predict the yield strength of additively manufactured Ti-6Al-4V subjected to one of three different heat-treatments: a stress relief anneal in the α+β phase field; a hot isostatic press treatment in the α+β phase field; and a β-anneal. The equations are nominally identical, though different strengthening mechanisms are active according to subtle microstructural differences. To achieve an equation that can predict the yield strength of the material, it is also necessary to include an assessment of dramatic reduction in the tensile strength due to texture (i.e., a “knock-down” effect). This has been experimentally measured, and included in this paper. The resulting predictions of yield strength are generally within 5% of their experimentally measured values.

Comments

This article is published as Hayes, Brian J., Brian W. Martin, Brian Welk, Samuel J. Kuhr, Thomas K. Ales, David A. Brice, Iman Ghamarian et al. "Predicting tensile properties of Ti-6Al-4V produced via directed energy deposition." Acta Materialia 133 (2017): 120-133. doi: 10.1016/j.actamat.2017.05.025. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Acta Materialia Inc

Language

en

File Format

application/pdf

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