Abstract
Recent studies have reached some antagonist conclusions regarding the benefits of post-processing treatments on fatigue performance of AlSi10Mg aluminium alloy processed by laser powder bed fusion (LPBF). Thus, this paper aims to explore the triangular relationship between post-processing routes, microstructure, and cyclic properties. In order to reach this goal, uniaxial strain-controlled fatigue tests are conducted on smooth specimens in low-cycle and high-cycle fatigue regimes for five different material states, encompassing the as-built condition, T6 condition, stress relief at a standard temperature, stress relief at a non-standard temperature, and stress relief at a non-standard temperature followed by hot isostatic pressure. It has been found that the microstructural transformations associated with the stress relief at both the standard and non-standard temperatures had a beneficial effect on fatigue strength of AlSi10Mg aluminium alloy processed by LPBF. Furthermore, the hot isostatic pressure treatment did not alter the fatigue performance.
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