Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)

Haize Galarraga; Robert J. Warren; Diana A. Lados; Ryan R. Dehoff; Michael M. Kirka; Peeyush Nandwana

doi:10.1016/j.msea.2017.01.019

Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)

Haize Galarraga, Robert J. Warren, Diana A. Lados, Ryan R. Dehoff, Michael M. Kirka, Peeyush Nandwana

Research output: Contribution to journal › Article › peer-review

322 Scopus citations

Abstract

Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that is used to fabricate three-dimensional near-net-shaped parts directly from computer models. Ti-6Al-4V is the most widely used and studied alloy for this technology and is the focus of this work in its ELI (Extra Low Interstitial) variation. Microstructure evolution and its influence on the mechanical properties of the alloy in the as-fabricated condition have been documented by various researchers. In the present work, different heat treatments were performed based on three approaches in order to study the effects of heat treatments on the unique microstructure formed during the EBM fabrication process. In the first approach, the effect of various cooling rates after the solutionizing process was studied. In the second approach, a correlation between the variation of α lath thickness during aging and the subsequent effect on mechanical properties was established. Lastly, several combined solutionizing and aging experiments were conducted; the results will be systematically discussed in the context of structural performance and design.

Original language	English
Pages (from-to)	417-428
Number of pages	12
Journal	Materials Science and Engineering: A
Volume	685
DOIs	https://doi.org/10.1016/j.msea.2017.01.019
State	Published - Feb 8 2017

Funding

This research was performed under the Additive Manufacturing program of the Integrative Material Design Center (iMdc) at Worcester Polytechnic Institute, in collaboration with the Additive Manufacturing Demonstration Facility of Oak Ridge National Laboratory, and sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. Ph.D. candidates Yuwei Zhai and Anthony Spangenberger of the iMdc also collaborated actively in the material characterization performed during this study.

Keywords

Additive manufacturing
Electron beam melting
Heat treatment
Mechanical characterization
Microstructure evolution
Ti-6Al-4V

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.msea.2017.01.019

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title = "Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)",

abstract = "Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that is used to fabricate three-dimensional near-net-shaped parts directly from computer models. Ti-6Al-4V is the most widely used and studied alloy for this technology and is the focus of this work in its ELI (Extra Low Interstitial) variation. Microstructure evolution and its influence on the mechanical properties of the alloy in the as-fabricated condition have been documented by various researchers. In the present work, different heat treatments were performed based on three approaches in order to study the effects of heat treatments on the unique microstructure formed during the EBM fabrication process. In the first approach, the effect of various cooling rates after the solutionizing process was studied. In the second approach, a correlation between the variation of α lath thickness during aging and the subsequent effect on mechanical properties was established. Lastly, several combined solutionizing and aging experiments were conducted; the results will be systematically discussed in the context of structural performance and design.",

keywords = "Additive manufacturing, Electron beam melting, Heat treatment, Mechanical characterization, Microstructure evolution, Ti-6Al-4V",

author = "Haize Galarraga and Warren, {Robert J.} and Lados, {Diana A.} and Dehoff, {Ryan R.} and Kirka, {Michael M.} and Peeyush Nandwana",

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AU - Galarraga, Haize

AU - Warren, Robert J.

AU - Lados, Diana A.

AU - Dehoff, Ryan R.

AU - Kirka, Michael M.

AU - Nandwana, Peeyush

PY - 2017/2/8

Y1 - 2017/2/8

N2 - Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that is used to fabricate three-dimensional near-net-shaped parts directly from computer models. Ti-6Al-4V is the most widely used and studied alloy for this technology and is the focus of this work in its ELI (Extra Low Interstitial) variation. Microstructure evolution and its influence on the mechanical properties of the alloy in the as-fabricated condition have been documented by various researchers. In the present work, different heat treatments were performed based on three approaches in order to study the effects of heat treatments on the unique microstructure formed during the EBM fabrication process. In the first approach, the effect of various cooling rates after the solutionizing process was studied. In the second approach, a correlation between the variation of α lath thickness during aging and the subsequent effect on mechanical properties was established. Lastly, several combined solutionizing and aging experiments were conducted; the results will be systematically discussed in the context of structural performance and design.

AB - Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that is used to fabricate three-dimensional near-net-shaped parts directly from computer models. Ti-6Al-4V is the most widely used and studied alloy for this technology and is the focus of this work in its ELI (Extra Low Interstitial) variation. Microstructure evolution and its influence on the mechanical properties of the alloy in the as-fabricated condition have been documented by various researchers. In the present work, different heat treatments were performed based on three approaches in order to study the effects of heat treatments on the unique microstructure formed during the EBM fabrication process. In the first approach, the effect of various cooling rates after the solutionizing process was studied. In the second approach, a correlation between the variation of α lath thickness during aging and the subsequent effect on mechanical properties was established. Lastly, several combined solutionizing and aging experiments were conducted; the results will be systematically discussed in the context of structural performance and design.

KW - Additive manufacturing

KW - Electron beam melting

KW - Heat treatment

KW - Mechanical characterization

KW - Microstructure evolution

KW - Ti-6Al-4V

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DO - 10.1016/j.msea.2017.01.019

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JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)

Abstract

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Keywords

UN SDGs

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