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Metallurgical and Materials Transactions A

, Volume 44, Issue 2, pp 1010–1022 | Cite as

Fatigue Life of Titanium Alloys Fabricated by Additive Layer Manufacturing Techniques for Dental Implants

  • Kwai S. Chan
  • Marie Koike
  • Robert L. Mason
  • Toru Okabe
Article

Abstract

Additive layer deposition techniques such as electron beam melting (EBM) and laser beam melting (LBM) have been utilized to fabricate rectangular plates of Ti-6Al-4V with extra low interstitial (ELI) contents. The layer-by-layer deposition techniques resulted in plates that have different surface finishes which can impact significantly on the fatigue life by providing potential sites for fatigue cracks to initiate. The fatigue life of Ti-6Al-4V ELI alloys fabricated by EBM and LBM deposition techniques was investigated by three-point testing of rectangular beams of as-fabricated and electro-discharge machined surfaces under stress-controlled conditions at 10 Hz until complete fracture. Fatigue life tests were also performed on rolled plates of Ti-6Al-4V ELI, regular Ti-6Al-4V, and CP Ti as controls. Fatigue surfaces were characterized by scanning electron microscopy to identify the crack initiation site in the various types of specimen surfaces. The fatigue life data were analyzed statistically using both analysis of variance techniques and the Kaplan-Meier survival analysis method with the Gehan-Breslow test. The results indicate that the LBM Ti-6Al-4V ELI material exhibits a longer fatigue life than the EBM counterpart and CP Ti, but a shorter fatigue life compared to rolled Ti-6Al-4V ELI. The difference in the fatigue life behavior may be largely attributed to the presence of rough surface features that act as fatigue crack initiation sites in the EBM material.

Keywords

Fatigue Fatigue Crack Fatigue Life Fatigue Crack Initiation Rolled Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was partially supported by a Research Grant DE018395 from the National Institutes of Health/National Institute of Dental and Craniofacial Research, Bethesda, MD 20892.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • Kwai S. Chan
    • 1
  • Marie Koike
    • 2
    • 3
  • Robert L. Mason
    • 4
  • Toru Okabe
    • 2
  1. 1.Mechanical Engineering DivisionSouthwest Research InstituteSan AntonioUSA
  2. 2.Baylor College of DentistryTexas A&M Health Science CenterDallasUSA
  3. 3.Nippon Dental University School of Life DentistryTokyoJapan
  4. 4.Fuels and Lubricants Research DivisionSouthwest Research InstituteSan AntonioUSA

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