Alternative Approach on an In-Situ Analysis of the Thermal Progression During the LPBF-M Process Using Welded Thermocouples Embedded into the Substrate Plate
Abstract
Laser powder bed fusion (LPBF-M) is a very potent technology for creating highly individualized, complex, and functional metal parts. One of the major influencing factors is the thermal progression. It
significantly determines size accuracy, microstructure and process stability. Therefore, creating an enhanced understanding of thermal phenomena through measurements and simulations is crucial to increase the reliability of the technology. Current research is mainly based on temperature measurements
of the upper layer, leaving major scope for the conditions at the substrate-part-interface. This area is of
utmost technical importance because it serves as the main heat sink. Insufficient heat dissipation leads
to accumulations of heat, deformations, and process breakdowns. This contribution presents a simple
and flexible method to analyze the thermal progression close to the part inside the substrate plate. The
acquired data shows very high consistency. Additionally, the results are compared to a model created
using an ISEMP developed FEM-Software which shows promising results for validation studies.