The need for rapid qualification and verification of low-volume production or specialised components built using AM drives the development of novel sensing and control technique for SLM processes. They need to address specific challenges, such as multi-layer deposition or complex fine features. Here, we review in-process sensing and control strategies for SLM of metal components.
Residual stresses remain inside a material after processing, when it has reached equilibrium with its environment. Rapid cooling of high localised thermal gradients lock in stresses that arise from localised compressive and tensile stresses introduced during rapid thermal expansion of material around the melt pool. The immediate effect of thermal strains during the build process is distortion. How can you limit the residual stresses in SLM?
In selective laser melting, scanning patterns influence critical features such as porosity, microstructure, surface roughness and heat build-up in the finished the metal components. Different scanning strategies documented in literature are now commercially accessible in production SLM machines.
Commercial viability of laser-based 3D printing and its general acceptance as a valid production technique resides in how it can limit the need for post--surface or -heat treatments. Surface roughness, with its capability to affect air flows and aerodynamics is a critical factor in aerospace or medical applications. The efficient function of high value components, such as combustion chambers in turbine engines, relies on high quality and controllable surface finish.
We provide practical and actionable info dedicated to additive manufacturing of high-value metal components