TY - GEN
T1 - Laser beam - Material interaction and thermal absorption model validation
AU - Lia, Frederick
AU - Park, Joshua Z.
AU - Tressler, Jay F.
AU - Martukanitz, Richard P.
N1 - Publisher Copyright:
Copyright © 2014 MS&T14®.
PY - 2014
Y1 - 2014
N2 - A thermo-absorption model for calculation of the heat transfer is proposed and experimentally validated for a laser directed energy deposition process. The bulk absorption (ß) may be defined as the ratio of the total power absorbed by the substrate (Pabs) to the laser power presented to the substrate (Pi). When combined with a value for exposure time, these terms may describe the energy absorbed and energy presented, respectively. The laser energy presented to the substrate may be accurately measured with a beam calorimeter, while the energy absorbed by the substrate can be obtained through process calorimetry measurements. Alloys Ti-6A1-4V and Inconel 625 were both evaluated using the process, and the tests were conducted at laser powers ranging from 1 kW to 2 kW. Experimental results determined the bulk absorption coefficient for the process with and without powder flow during laser deposition.
AB - A thermo-absorption model for calculation of the heat transfer is proposed and experimentally validated for a laser directed energy deposition process. The bulk absorption (ß) may be defined as the ratio of the total power absorbed by the substrate (Pabs) to the laser power presented to the substrate (Pi). When combined with a value for exposure time, these terms may describe the energy absorbed and energy presented, respectively. The laser energy presented to the substrate may be accurately measured with a beam calorimeter, while the energy absorbed by the substrate can be obtained through process calorimetry measurements. Alloys Ti-6A1-4V and Inconel 625 were both evaluated using the process, and the tests were conducted at laser powers ranging from 1 kW to 2 kW. Experimental results determined the bulk absorption coefficient for the process with and without powder flow during laser deposition.
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M3 - Conference contribution
AN - SCOPUS:84925639551
T3 - Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
SP - 2019
EP - 2035
BT - Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
PB - Association for Iron and Steel Technology, AISTECH
T2 - Materials Science and Technology Conference and Exhibition 2014, MS and T 2014
Y2 - 12 October 2014 through 16 October 2014
ER -