Effect of microstructure, residual stresses and building orientation on the fatigue response up to 109 cycles of an SLM AlSi10Mg alloy. (August 2020)

• Record Type: Journal Article
• Authors: Tridello, A.; Fiocchi, J.; Biffi, C.A.; Chiandussi, G.; Rossetto, M.; Tuissi, A.; Paolino, D.S.
• Is Part Of: International journal of fatigue. Volume 137(2020)
• Publication Date: 2020-08
• Subjects: Additive Manufacturing -- Selective Laser Melting (SLM) -- Very-High-Cycle-Fatigue (VHCF) -- AlSi10Mg alloy -- Microstructure -- Residual stresses -- Building orientation; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.105659
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Microstructure can have a prevalent effect on the VHCF response than defect size. Influence of residual stresses on the VHCF response increases with the defect size. Interactions between microstructure, defects and residual stresses are detrimental. Building orientation affects the VHCF response of AlSi10Mg specimens. VHCF strength of horizontal specimens is larger than that of vertical specimens. Abstract: It is well-known in the literature that the fatigue response of specimens produced through Additive Manufacturing (AM) processes is mainly controlled by the defect population. Nevertheless, microstructure, residual stresses and building orientation must be considered as they may also play a significant role. In the present paper, the influence of microstructure, residual stresses and building orientation on the Very-High-Cycle-Fatigue (VHCF) response of SLM AlSi10Mg specimens has been experimentally assessed. Ultrasonic tests on AlSI10Mg specimens with different building orientations and subjected to different heat treatments showed that, together with the defect size, microstructure and residual stresses significantly affect the VHCF response.