Abstract
Laser-based powder bed fusion (L-PBF) is nowadays the preeminent additive manufacturing (AM) technique to produce metal parts. Nonetheless, relatively few metal powders are currently available for industrial L-PBF, especially if aluminum-based feedstocks are involved. In order to fill the existing gap, A357.0 (also known as A357 or A13570) powders are here processed by L-PBF and, for the first time, the fatigue behavior is investigated in the as-built state to verify the net-shaping potentiality of AM. Both the low-cycle and high-cycle fatigue areas are analyzed to draw the complete Wohler diagram. The infinite lifetime limit is set to 2 × 106 stress cycles and the staircase method is applied to calculate a mean fatigue strength of 60 MPa. This value is slightly lower but still comparable to the published data for AlSi10Mg parts manufactured by L-PBF, even if the A357.0 samples considered here have not received any post-processing treatment.
Highlights
IntroductionModel by adding material one layer at the time until the desired shape is finished
Known as three-dimensional (3D) printing, includes a wide group of technologies that are able to produce a 3D part according to a Computer Aided Design (CAD)
On account of the increasing need for new feedstock materials for additive manufacturing (AM) and related information On account of the increasing need for new feedstock materials for AM and related information about their mechanical performance, the fatigue behavior of A375.0 parts produced via laser-based about their mechanical performance, the fatigue behavior of A375.0 parts produced via laser-based powder bed fusion was investigated by means of two combined approaches
Summary
Model by adding material one layer at the time until the desired shape is finished. With respect to conventional subtractive or formative methods such as extrusion, forging, machining, etc., AM allows for wider freedom in geometry, reduced design constraints, minor assembly and joining requirements, limited material waste, and a shorter time-to-market [1]. AM methods are often regarded as “near net shaping techniques”, even if the layered strategy at the core of AM inherently poses several issues about the surface finishing of printed parts, with a roughness commonly exceeding an. The sale of AM products and services is expected to grow from US $5.2 billion in 2015 to over US $26.5 billion by 2021
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