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Corrosion-Fatigue of Ti-6Al-4V Coupons Manufactured by Directed Energy Deposition
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  • Daniel Hattingh,
  • S. Botha,
  • D. Bernard,
  • Neil James,
  • Anton du Plessis
Daniel Hattingh
Nelson Mandela University

Corresponding Author:danie.hattingh@mandela.ac.za

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S. Botha
Nelson Mandela University
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D. Bernard
Nelson Mandela University
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Neil James
Nelson Mandela University
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Anton du Plessis
Nelson Mandela University
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Abstract

Titanium is a versatile biocompatible metal that is desirable in additively manufactured medical implant devices. However, additively manufactured parts have particular microstructures, porosity, residual stress and surface conditions which can have a strong impact on fatigue performance. Implants have an added complexity from the saline operating environment and the associated impact on the safe design life. Equally, direct energy deposition induces a complex thermal history which, if not carefully controlled, can significantly alter the mechanical/material properties of the component. This study investigates the decrease in fatigue life, in an in-vitro body fluid simulation using Ringer’s solution, observed in Ti-6Al-4V specimens extracted from coupons manufactured by directed energy deposition. An interrupted deposition strategy was employed to control build regularity, which appeared to influence certain mechanical properties, including corrosion fatigue life. An ≈50% decrease in fatigue life was observed in Ringer’s solution at 6 Hz loading frequency, clearly important in designing implants.
19 Jan 2022Submitted to Fatigue & Fracture of Engineering Materials & Structures
19 Jan 2022Submission Checks Completed
19 Jan 2022Assigned to Editor
21 Jan 2022Reviewer(s) Assigned
14 Feb 2022Review(s) Completed, Editorial Evaluation Pending
16 Feb 2022Editorial Decision: Revise Major
14 Mar 20221st Revision Received
14 Mar 2022Submission Checks Completed
14 Mar 2022Assigned to Editor
14 Mar 2022Reviewer(s) Assigned
25 Mar 2022Review(s) Completed, Editorial Evaluation Pending
26 Mar 2022Editorial Decision: Revise Major
28 Mar 20222nd Revision Received
28 Mar 2022Submission Checks Completed
28 Mar 2022Assigned to Editor
28 Mar 2022Reviewer(s) Assigned
28 Mar 2022Review(s) Completed, Editorial Evaluation Pending
30 Mar 2022Editorial Decision: Accept
18 Apr 2022Published in Fatigue & Fracture of Engineering Materials & Structures. 10.1111/ffe.13714