Effect of the process gas and scan speed on the properties and productivity of thin 316L structures produced by Laser-Powder Bed Fusion
Artikel i vetenskaplig tidskrift, 2020

The development of the laser powder bed fusion (L-PBF) process to increase its robustness and productivity is challenged by ambitious design optimizations, such as thin wall structures. In this study, in addition to the effect of commonly used gases as Ar and N2, increased laser scanning speed and new process gases, such as helium, were successfully implemented. This implementation allowed to build 316L stainless steel components with thin walls of 1 mm thickness with an enhanced build rate of 37 pct. The sample size effect and the surface roughness were held responsible for the reduction in strength (YS > 430 MPa) and elongation (EAB > 30 pct) for the 1 mm samples studied. Similar strength was achieved for all process gases. The increased scanning speed was accompanied by a more random texture, smaller cell size, and grain size factor along the building direction when compared to the material built with the standard laser parameters. Stronger preferential orientation 〈101〉 along the building direction was observed for material built with standard parameters. Finally, the use of helium as a process gas was successful and resulted in reduced cell size. This finding is promising for the future development of high strength 316L stainless steel built with high build rates.

Författare

Camille Nicole Géraldine Pauzon

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Alexander Leicht

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Uta Klement

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Pierre Forêt

Linde AG AT EMEA

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

1073-5623 (ISSN)

Vol. Article in press

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1007/s11661-020-05923-w

Mer information

Senast uppdaterat

2020-08-20