Laser beam - Material interaction and thermal absorption model validation

Frederick Lia, Joshua Z. Park, Jay F. Tressler, Richard Martukanitz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publicationMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages2019-2035
Number of pages17
ISBN (Electronic)9781634397230
StatePublished - Jan 1 2014
EventMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014 - Pittsburgh, United States
Duration: Oct 12 2014Oct 16 2014

Publication series

NameMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
Volume3

Other

OtherMaterials Science and Technology Conference and Exhibition 2014, MS and T 2014
CountryUnited States
CityPittsburgh
Period10/12/1410/16/14

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Materials Science(all)

Cite this

Lia, F., Park, J. Z., Tressler, J. F., & Martukanitz, R. (2014). Laser beam - Material interaction and thermal absorption model validation. In Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 (pp. 2019-2035). (Materials Science and Technology Conference and Exhibition 2014, MS and T 2014; Vol. 3). Association for Iron and Steel Technology, AISTECH.