Radiometric and Metallurgical Analysis of Zone Formation in Elementary Laser Deposited Thin-Wall Structures

Abstract

Laser Powder Deposition (LPD) is an additive manufacturing process used for solid freeform fabrication, surface modification, and part repair or remanufacture. This technology offers some significant advantages over traditional manufacturing processes, such as reduced post-process machining and reduced material waste. Most importantly, LPD offers increased flexibility in order to meet the demands of diverse markets. However, the connection between deposition parameters, thermal gradients, and final part quality is not sufficiently understood. The research discussed here shows how radiometric temperature measurements provide insight into the connection between process parameters and final part quality. These measurements can be used to augment the research and development process while maintaining process flexibility. Radiometric thermal data was collected during the deposition of ASTM/SAE 1045, 4130, and 4140 steel thin-wall samples. Several thermal zones were identified by radiometric analysis, and compared to post-process metallographic and dimensional inspection.