The Effects of Submerged Laser Peening, Cavitation Peening, and Shot Peening on the Improvement of the Torsional Fatigue Strength of Powder Bed Fused Ti6al4v Produced Through Laser Sintering

27 Pages Posted: 29 Feb 2024

See all articles by Hitoshi Soyama

Hitoshi Soyama

Tohoku University

Kwan Lok Wong

affiliation not provided to SSRN

Daniel Eakins

University of Oxford

Alexander M. Korsunsky

University of Oxford - Multi-Beam Laboratory for Engineering Microscopy

Abstract

This study demonstrates the improvement in the fatigue strength of additive manufacturing (AM) metals such as laser-based powder bed fusion of metals by post-processing. Titanium alloy samples manufactured by powder bed fused (PBF) Ti6Al4V produced through laser sintering (LS), treated by submerged laser peening (SLP), cavitation peening (CP), and shot peening (SP), were subjected to torsional fatigue testing and compared with the as-built specimen. At SLP, the samples were treated by laser ablation (LA) and laser cavitation (LC) which was developed following LA. A cavitating jet was used for CP. For comparison, conventional post-processing using SP was also performed. To characterize the microstructural modification caused by the three post-processing methods, the cross-section of the treated surface was observed by electron backscatter diffraction. The fatigue strengths at 107 cycles were found to be 217, 361, 313, and 285 MPa for the as-built, SLP, CP, and SP specimens, respectively. The primary factors contributing to fatigue strength improvement by post-processing were surface smoothing and the introduction of compressive residual stress. The experimental observations were used to derive correlation formulas to estimate the fatigue life improvement due to post-processing as the function of the surface roughness and surface residual stress.

Keywords: Fatigue strength, Additive manufacturing, Submerged laser peening, Cavitation peening, Shot peening

Suggested Citation

Soyama, Hitoshi and Wong, Kwan Lok and Eakins, Daniel and Korsunsky, Alexander M., The Effects of Submerged Laser Peening, Cavitation Peening, and Shot Peening on the Improvement of the Torsional Fatigue Strength of Powder Bed Fused Ti6al4v Produced Through Laser Sintering. Available at SSRN: https://ssrn.com/abstract=4743543 or http://dx.doi.org/10.2139/ssrn.4743543

Hitoshi Soyama (Contact Author)

Tohoku University ( email )

6-6-01 Aoba, Aramaki, Aoba-ku
Sendai, Miyagi 980-8579
Japan
+81227956891 (Phone)

HOME PAGE: http://https://web.tohoku.ac.jp/ism/index.html

Kwan Lok Wong

affiliation not provided to SSRN ( email )

No Address Available

Daniel Eakins

University of Oxford ( email )

Mansfield Road
Oxford, OX1 4AU
United Kingdom

Alexander M. Korsunsky

University of Oxford - Multi-Beam Laboratory for Engineering Microscopy ( email )

United Kingdom

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