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Journal of Materials Engineering and Performance

, Volume 22, Issue 12, pp 3872–3883 | Cite as

Microstructures and Mechanical Properties of Ti6Al4V Parts Fabricated by Selective Laser Melting and Electron Beam Melting

  • H. K. Rafi
  • N. V. Karthik
  • Haijun Gong
  • Thomas L. Starr
  • Brent E. Stucker
Article

Abstract

This work compares two metal additive manufacturing processes, selective laser melting (SLM) and electron beam melting (EBM), based on microstructural and mechanical property evaluation of Ti6Al4V parts produced by these two processes. Tensile and fatigue bars conforming to ASTM standards were fabricated using Ti6Al4V ELI grade material. Microstructural evolution was studied using optical and scanning electron microscopy. Tensile and fatigue tests were carried out to understand mechanical properties and to correlate them with the corresponding microstructure. The results show differences in microstructural evolution between SLM and EBM processed Ti6Al4V and their influence on mechanical properties. The microstructure of SLM processed parts were composed of an α′ martensitic phase, whereas the EBM processed parts contain primarily α and a small amount of β phase. Consequently, there are differences in tensile and fatigue properties between SLM- and EBM-produced Ti6Al4V parts. The differences are related to the cooling rates experienced as a consequence of the processing conditions associated with SLM and EBM processes.

Keywords

EBM fatigue testing microstructure SLM tensile testing 

Notes

Acknowledgments

The authors acknowledge the Office of Naval Research (ONR), USA for support through grant #’s N00014-09-1-0147, N00014‐10‐1‐0800, and N00014-11-1-0689.

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Copyright information

© ASM International 2013

Authors and Affiliations

  • H. K. Rafi
    • 1
  • N. V. Karthik
    • 1
  • Haijun Gong
    • 1
  • Thomas L. Starr
    • 1
  • Brent E. Stucker
    • 1
  1. 1.Department of Industrial Engineering, JB Speed School of EngineeringUniversity of LouisvilleLouisvilleUSA

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