Hot dwell-fatigue behaviour of additively manufactured AlSi10Mg alloy: Relaxation, cyclic softening and fracture mechanisms

This paper presents the results of high temperature strain-range controlled low cycle fatigue tests a laser powder bead fused AlSi10Mg alloy. Following stress relief (2hrs at 300 ℃), two cyclic loading waveforms (standard triangular and dwell-type trapezoidal waveforms) three temperatures (100 ℃, 250 ℃ 400 ℃) were applied to investigate both mechanical response related microstructural changes this additively manufactured (AM) aluminium The bulk responses found exhibit continuous softening, decreasing relaxation decreased energy dissipated per cycle. is strongly affected by test rising almost complete ℃. At lower higher more subgrains are developed during loading. Up subgrain size increases with defects preferentially act as crack initiation sites. While coarse Si particles precipitate deformation density microvoids nucleated from these precipitates, which grow link up cause failure, resulting in dimple dominated ductile fracture.