Effect of as-built residual stress state on the fatigue response of a LPBF AlSi10Mg alloy
Laser Powder Bed Fused (LPBF) AlSi10Mg materials exhibit increased as-built yield strength when compared to conventional as-built cast products due to the fine silicon network and small grain size resulting from the very fast cooling rates occurring after the laser-induced melting. These fast cooling rates also induce high tensile residual stress (RS) at the surface of as-built specimens, which are reported to lead to a reduction in the fatigue life and crack porpagation behaviour of LPBF alloys such as Ti6Al4V. Literature report contradictory fatigue results for the as-built condition of LPBF AlSi10Mg materials, where the deleterious/favourable effect of RS is usually hypothesised. This is because compared to other popular LPBF alloys like Ti6Al4V, the RS state of LPBF AlSi10Mg alloys is poorly studied. So far, it has been observed that the processing parameters significantly alter the surface RS state. Thus, a thorough determination of the surface and bulk RS within fatigue samples is required to further elucidate the influence of RS on the as-built fatigue life and crack propagation behaviour of LPBF AlSi10Mg materials.
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Itziar Serrano-Munoz; CABEZA Sandra; EVANS Alexander; MADIA Mauro; MISHUROVA Tatiana; PIRLING Thilo and ROVEDA Ilaria. (2021). Effect of as-built residual stress state on the fatigue response of a LPBF AlSi10Mg alloy. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-338
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