Fatigue property of Shot peened Maraging Steel fabricated by Additive manufacturing

Author:  Toshiya Tsujia1, Yuji Kobayashia1, Kiyotaka Masaki 2 1 SINTOKOGIO, LTD., Development group, 180-1 Komaki Ohgi-cho Toyokawa, Aichi, Japan 2 Okinawa College, National Institute of Technology, 905 Henoko Nago, Okinawa, Japan
Source:  ICSP14 Milan
Doc ID:  2022073
Year of Publication:  2022
Abstract:  
Abstract Shot peened maraging steel fabricated by additive manufacturing were evaluated the fatigue strength by rotating bending fatigue test. It is to investigate the influence of shot peening for the fatigue property of additive manufactured parts. The specimen was employed the surface which was as-built and the surface which was polished. As a result, shot peened specimens increased 2.5 times higher fatigue strength than As-built specimens. Fatigue fracture origin changed form surface to internal by shot peening. Furthermore, shot peened specimens were higher fatigue strength and longer fatigue life than Polished specimen. Fatigue fracture origin changed from surface to internal by shot peening. Therefore, shot peening drastically affects to increase the fatigue strength of additive manufactured material due to prevention of surface crack propagation by the inducing compressive residual stress. Keywords Shot peening, Additive manufacturing, Fatigue strength, Maraging steel