ABSTRACT
Laser powder deposition (LPD) is a directed energy deposition additive manufacturing (AM) process used for solid freeform fabrication, surface modication, and repair. LPD offers increased manufacturing exibility to meet the demands of diverse markets. However, the connection between deposition parameters, thermal history, and nal part quality is not sufciently understood. Radiometric temperature measurements provide a real-time non-contact method for advancement of AM process understanding. These measurements can be used to augment process development, or process control, for the prodigious adoption of metal AM. Radiometric thermal data, collected during the deposition of AISI/SAE 1045, 4130, and 4140 steel thin-wall samples, were used to illustrate the connection between process input and nal part quality. Several thermal zones were identied and compared to post-process metallographic analysis.
