Comparison Of Peening Effect Between Additive Manufacutred And Drawing Titanium Alloy

Author:  Hitoshi Soyama
Source:  ICSP-15
Doc ID:  2026042
Year of Publication:  2026
Abstract:  
Although additively manufactured (AM) metals are attractive materials, their remarkable weak fatigue properties are an obstacle to their practical application. Thus, post-processing to improve their fatigue properties is required. In the present study, powder bed fusion using laser sintering titanium alloy, i.e., PBF-LS/Ti6Al4V was treated by shot peening (SP), submerged laser peening (SLP), cavitation peening (CP), and fine particle bombarding (FPB), then the fatigue properties were investigated by a torsional fatigue test, comparing with drawing Ti6Al4V. It was revealed that the fatigue strength at 107 was 446 ± 5 MPa for PBFLS/ Ti6Al4V treated by FPB+CP, 359 ± 9 MPa for LS/Ti6Al4V treated by SLP and 457 ± 22 MPa for drawing Ti6Al4V treated by SLP, whereas it was 210 ± 10 MPa for as-built (AB) PBFLS/ Ti6Al4V and 346 ± 26 MPa for non-peened drawing Ti6Al4V. Namely, the fatigue strength of PBF-LS/Ti6Al4V treated by FPB+CP exceeded that of non-peened (NP) drawing Ti6Al4V.