Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Roger Beal; Seyyed‐Danial Salehi; Owen T. Kingstedt

doi:10.1111/ffe.14316

journal article Open Access May 02, 2024

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Roger Beal Seyyed‐Danial Salehi Owen T. Kingstedt

Fatigue & Fracture of Engineering Materials & Structures Vol. 47 No. 7 pp. 2599-2615 · Wiley

View at Publisher Save 10.1111/ffe.14316

Abstract

AbstractIn this study, laser powder bed fusion (LPBF)‐produced Ti‐6Al‐4V is subjected to three separate post‐build heat treatments (HTs), specifically (1) a one‐step annealing HT exceeding the
‐transus temperature, (2) a two‐step annealing HT whose first step exceeds the
‐transus temperature and the second step is an anneal below the
‐transus temperature, and (3) a sawtooth HT with temperatures oscillating below the
‐transus temperature. Tensile properties and fatigue crack growth behavior were assessed and compared to wrought Ti‐6Al‐4V. LPBF materials nominally exhibited a 17% yield stress reduction, 1.9% strain‐to‐failure increase, and 9.2% modulus of toughness decrease. Fatigue crack growth curves were used to assess the linear crack growth rate region and approximate fracture toughness (
). Post‐mortem fractography observed striations indicating the crack growth direction frequently changes direction providing an understanding of the slower crack growth rates observed in LPBF materials compared to their wrought counterpart.

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Details

Published: May 02, 2024
Vol/Issue: 47(7)
Pages: 2599-2615
License: View

Authors

R

Roger Beal

Department of Mechanical Engineering University of Utah Salt Lake City Utah USA

S

Seyyed‐Danial Salehi

Department of Mechanical Engineering University of Utah Salt Lake City Utah USA

O

Owen T. Kingstedt

Department of Mechanical Engineering University of Utah Salt Lake City Utah USA

Cite This Article

Roger Beal, Seyyed‐Danial Salehi, Owen T. Kingstedt (2024). Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance. Fatigue & Fracture of Engineering Materials & Structures, 47(7), 2599-2615. https://doi.org/10.1111/ffe.14316

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

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