Design and Applications of Additive Manufacturing and 3D Printing

摘要

Additive manufacturing (AM), or commonly, 3D printing, has been witnessed invarious applications and purposes such as industrial applications in consumer products,energy, aerospace, medical, spare parts 1–6 and research and development activities suchas prototyping, testing and material development 7–9. What is common to all of theseis that AM is not possible without the 3D model resulting from the design phase. SinceAM allows the manufacture of complex geometries, we can improve the performance ofthe products through that. However, it is challenging to specify the best geometry foreach purpose since we can optimize different things such as the mass, strength, price,manufacturing speed or performance. In addition, different AM processes require differentapproaches. This Special Issue offers a platform for researchers to study and report differentdesign aspects of AM by taking into account differences between AM processes. Fiveoriginal articles were published in this issue.For the powder bed fusion of Ti6Al4V, Akram et al. 10 established a linear relationshipbetween percentage elongation and the combined size of α lath and powder layer thicknessusing the rule of mixtures. They studied the microstructure’s effect on the magnitudeand anisotropy of the resultant mechanical properties, such as the yield strength andelongation. A Hall–Petch relationship was established between the α lath size and the yieldstrength magnitude for the as-built, heat-treated, transverse, and longitudinal built samples.Percentage elongation was affected by both α lath size and powder layer thickness, due toits correlation with the prior β columnar grain size.