Processing of metallic materials by Laser Powder Bed Fusion at elevated temperatures

článek ve sborníku mimo WoS a Scopus

en

Laser Powder Bed Fusion (L-PBF) is a 3D printing technology that has gained worldwide acceptance due to its high resolution and accuracy. However, high equipment and material costs, residual stresses in the manufactured parts and internal defects are still major barriers to widespread industrial use. Preheating is a process in which the powder bed is heated during the production run. This leads to a homogenisation of the temperature field, which usually results in lower residual stresses. It also affects the interaction between the laser beam and the powder as well as the solidification process. The effects of high temperature preheating on residual stresses have been studied on Ti6Al4V and Inconel 939. This study evaluates the suitability of preheating to reduce the number of support structures, thereby reducing production costs and environmental impact. The results showed that preheating at high temperatures led to a rapid reduction of residual stresses in Ti6Al4V, but also to a rapid powder degradation. In contrast, preheating led to increased residual stresses in Inconel 939 due to microstructural changes. Therefore, preheating was evaluated as an uneconomical method for removing support structures in Ti6Al4V and Inconel 939.

Laser Powder Bed Fusion (L-PBF) is a 3D printing technology that has gained worldwide acceptance due to its high resolution and accuracy. However, high equipment and material costs, residual stresses in the manufactured parts and internal defects are still major barriers to widespread industrial use. Preheating is a process in which the powder bed is heated during the production run. This leads to a homogenisation of the temperature field, which usually results in lower residual stresses. It also affects the interaction between the laser beam and the powder as well as the solidification process. The effects of high temperature preheating on residual stresses have been studied on Ti6Al4V and Inconel 939. This study evaluates the suitability of preheating to reduce the number of support structures, thereby reducing production costs and environmental impact. The results showed that preheating at high temperatures led to a rapid reduction of residual stresses in Ti6Al4V, but also to a rapid powder degradation. In contrast, preheating led to increased residual stresses in Inconel 939 due to microstructural changes. Therefore, preheating was evaluated as an uneconomical method for removing support structures in Ti6Al4V and Inconel 939.

Laser Powder Bed Fusion, Selective Laser Melting, Preheating, Ti6Al4V, Inconel 939, Residual stress, Support structures, Finite element method

19.10.2023

Metal Additive Manufacturing Conference 2023

WKO, Vienna

Metal Additive Manufacturing Conference 2023

129–139

11