Very high cycle fatigue and fatigue crack propagation behavior of selective laser melted AlSi12 alloy

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

“…Among the analyzed documents, [6,8,[28][29][30][31][32] report the fatigue limit of the specimens produced by SLM and consider different laser speeds, platform temperatures and specimen orientations with respect to the building direction. On some of the samples, a T6 heat treatment or HIP process was also performed.…”

“…The importance of stress relieving is highlighted by the results in [30][31][32] for SLM: a non-heat-treated specimen exhibited very high fatigue properties, even with respect to castings, just by pre-heating the powder to 200°C.…”

Fatigue‐life prediction of additively manufactured material: Effects of heat treatment and build orientation

“…2,8,12 When the residual stresses in an AM part are limited and the microstructure is nearly homogeneous-for instance, by postfabrication heat treatments or preheating the build plate-defect characteristics (ie, size, shape, location, and distribution) are the main factor affecting the fatigue performance. [20][21][22][23] Thus, being able to predict the fatigue resistance of AM parts from defect characteristics can address the issue of uncertainty. This can significantly decrease the time and cost for the development of new products via AM.…”

High cycle fatigue life estimation of materials processed by laser powder bed fusion

“…Several experimental studies on the fatigue life of AlSi10Mg alloys with respect to different LPBF processing parameters have been conducted in the recent years . Among the findings, the key conclusions suggest that elevating the substrate temperature during LPBF processing, and post‐LPBF heat treatment (T6) of the as‐built samples, increases the fatigue life significantly.…”

“…Several experimental studies on the fatigue life of AlSi10Mg alloys with respect to different LPBF processing parameters have been conducted in the recent years. [12][13][14][15][16] Among the findings, the key conclusions suggest that elevating the substrate temperature during LPBF processing, and post-LPBF heat treatment (T6) of the as-built samples, increases the fatigue life significantly. The microstructure will recrystallize upon solution heat treatment, which in turn will mitigate the anisotropic effect of the as-built columnar microstructure.…”