Title

Electron beam melting of porous titanium alloys: Microstructure and mechanical behavior

Document Type

Book Chapter

Publication Title

Development and Application of Biomedical Titanium Alloys

First Page

94

Last Page

112

Publisher

Bentham Science Publishers

Place of Publication

Sharjah, UAE

Editor(s)

Liqiang Wang, Lai-Chang Zhang

School

School of Engineering

RAS ID

26920

Comments

Originally published as: Zhang, L. C., Liu, Y., & Wang, L. (2018). Electron Beam Melting of Porous Titanium Alloys: Microstructure and Mechanical Behavior. Development and Application of Biomedical Titanium Alloys, 94. Original article available here

Abstract

Electron beam melting (EBM) is a relatively new rapid, additive manufacturing technology which is capable of fabricating complex, multi-functional metal or alloy components directly from CAD models, selective melting of precursor powder beds. Compared with Ti-6Al-4V samples with same porosity level, the EBMproduced β-type Ti-24Nb-4Zr-8Sn (Ti2448) porous components exhibit a higher normalized fatigue strength owing to super-elastic property, greater plastic zone ahead of the fatigue crack tip and the crack deflection behavior. The super-elastic property can be improved by increasing porosity of porous samples as a result of increasing the tensile/compressive stress ratio of the porous structure. EBM-produced components exhibit more than twice the strength-to-modulus ratio of porous Ti-6Al-4V counterparts. The position of fatigue crack initiation is defined in strain curves based on the variation of the fatigue cyclic loops. The unique manufacturing process of EBM results in the generation of different sizes of grains, and the apparent fatigue crack deflection occurs at the grain boundaries in the columnar grain zone due to substantial misorientation between adjacent grains.

DOI

10.2174/9781681086194118010007

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