Residual Lattice Strain and Phase Distribution in Ti-6Al-4V Produced by Electron Beam Melting

Materials
Tuerdi MaimaitiyiliChristina Bjerkén

Abstract

Residual stress/strain and microstructure used in additively manufactured material are strongly dependent on process parameter combination. With the aim to better understand and correlate process parameters used in electron beam melting (EBM) of Ti-6Al-4V with resulting phase distributions and residual stress/strains, extensive experimental work has been performed. A large number of polycrystalline Ti-6Al-4V specimens were produced with different optimized EBM process parameter combinations. These specimens were post-sequentially studied by using high-energy X-ray and neutron diffraction. In addition, visible light microscopy, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) studies were performed and linked to the other findings. Results show that the influence of scan speed and offset focus on resulting residual strain in a fully dense sample was not significant. In contrast to some previous literature, a uniform α- and β-Ti phase distribution was found in all investigated specimens. Furthermore, no strong strain variations along the build direction with respect to the deposition were found. The magnitude of strain in α and β phase show some variations both in the build plane and along the buil...Continue Reading

References

May 31, 2002·Acta Crystallographica. Section B, Structural Science·Alec BelskyPeter Luksch
Jul 25, 2009·Journal of the Mechanical Behavior of Biomedical Materials·L E MurrR B Wicker
Jul 3, 2015·Journal of Synchrotron Radiation·Tuerdi MaimaitiyiliFabienne Ribeiro
Aug 5, 2017·Materials·Tatiana MishurovaGiovanni Bruno

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Citations

Apr 11, 2020·Materials·Tuerdi MaimaitiyiliHelena Van Swygenhoven
Jan 1, 2021·The Review of Scientific Instruments·Oliver LöhmannRobin Woracek

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Methods Mentioned

BETA
electron beam
X-ray
neutron diffraction
neutron

Software Mentioned

MATLAB
TOPAS
Academic

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