High fatigue resistance in a titanium alloy via near-void-free 3D printing.
biomechanical · Level V
Where this comes from
- Record sourced from PubMed, PMID 38418915.
- Also identified by DOI 10.1038/s41586-024-07048-1.
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Abstract
The advantage of 3D printing-that is, additive manufacturing (AM) of structural materials-has been severely compromised by their disappointing fatigue properties<sup>1,2</sup>. Commonly, poor fatigue properties appear to result from the presence of microvoids induced by current printing process procedures<sup>3,4</sup>. Accordingly, the question that we pose is whether the elimination of such microvoids can provide a feasible solution for marked enhancement of the fatigue resistance of void-free AM (Net-AM) alloys. Here we successfully rebuild an approximate void-free AM microstructure in Ti-6Al-4V titanium alloy by development of a Net-AM processing technique through an understanding of the asynchronism of phase transformation and grain growth. We identify the fatigue resistance of such AM microstructures and show that they lead to a high fatigue limit of around 1 GPa, exceeding the fatigue resistance of all AM and forged titanium alloys as well as that of other metallic materials. We confirm the high fatigue resistance of Net-AM microstructures and the potential advantages of AM processing in the production of structural components with maximum fatigue strength, which is beneficial for further application of AM technologies in engineering fields.