General ILL Seminar, organised by College 1

CHLaser powder bed fusion (LPBF) is an additive manufacturing method for metals, where properties are controlled through variables like printing parameters, building geometries, etc. Modern advancements allow for real-time microstructure modifications, requiring a deep understanding of changes during the process. Operando/in-situ neutron measurements provide valuable insights during LPBF, as neutrons can penetrate metals several centimeters deep. The Paul Scherrer Institute in Switzerland developed a downsized LPBF machine (n-SLM) to facilitate these measurements. The n-SLM supports various neutron techniques to study residual strains, dislocation densities, phase changes, defects, and temperatures during printing. Neutron diffraction observed dislocation density changes due to laser rescanning. Polarized neutron imaging captured phase transformations in multi-material systems, and conventional neutron imaging identified defects like porosity and cracks. Focusing on the cold wavelength range beyond the last Bragg edges produced maps showing temperature evolution. These capabilities and findings will be presented in the seminar.

Room 036 in Science Building