Heat treatment degrading the corrosion resistance of selective laser melted Ti-6Al-4V alloy

Document Type

Journal Article

Publication Title

Journal of The Electrochemical Society

Publisher

Electrochemical Society Inc.

School

School of Engineering

RAS ID

24698

Comments

Dai, N., Zhang, J., Chen, Y., & Zhang, L. C. (2017). Heat treatment degrading the corrosion resistance of selective laser melted Ti-6Al-4V alloy. Journal of The Electrochemical Society, 164(7), C428-C434. https://doi.org/10.1149/2.1481707jes

Abstract

Ti-6Al-4V alloy produced by selective laser melting (SLM) was reported to exhibit an inferior corrosion resistance compared with the traditionally processed Grade 5 alloy, due to the formation of high-energy metastable α′ martensite with regard to α martensite. This work manipulates the transformation of α′ martensite to α martensite by heat-treatment in SLM-produced Ti-6Al-4V alloy and studies the effect on its corrosion behavior using electrochemical tests and microstructural analysis. The electrochemical results reveal that the heat-treated SLM-produced samples exhibit a higher corrosion rate than the as-received counterparts. The microstructural characterization results show that the acicular α′ martensite vanishes gradually, and a plate-shaped α phase and a lamellar α + β mixture continuously form with enhancing heat-treatment temperature, which increases the grain size. The relation between changes in grain size and corrosion resistance of SLM-produced Ti-6Al-4V has been discussed in detail.

DOI

10.1149/2.1481707jes

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