Layer-Wise Melt Pool Temperature Evolution in Laser Powder Bed Fusion: An Experimental Study Using A Single Camera Based Twowavelength Imaging Pyrometry

Chaitanya Krishna Prasad Vallabh, Shawn Hinnebusch, Albert C. To, Xiayun Zhao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In metal additive manufacturing (AM) the layer-wise thermal history is crucial for its effect on the print part properties, such as, microstructure, porosity, and mechanical strength. Literature studies for evaluating the part thermal history are typically based on in-situ infrared thermography and thermal modeling. However, the effect of melt pool temperature on the part thermal history has not been widely studied. In this preliminary work, for the first time we present a large and comprehensive in-situ monitored, layer-wise melt pool temperature evolution data for laser powder bed fusion (LPBF) AM. The melt pool temperature is evaluated using an in-house Single Camera Two-Wavelength Imaging Pyrometry (STWIP) system. The melt pool temperature evolution was evaluated for three different prints with different inter-layer-Times and print heights. The melt pool temperature history trends presented in this work are in agreement with literature studies on partthermal histories. The LPBF process signatures from our STWIP system can help develop more accurate thermal models with the melt pool temperature as the input and the unique capability of the STWIP system to acquire and analyze large amounts data facilitates the development of machine learning models for estimating part properties based on the process signatures.

Original languageEnglish
Title of host publicationManufacturing Processes; Manufacturing Systems
ISBN (Electronic)9780791885819
DOIs
StatePublished - 2022
EventASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022 - West Lafayette, United States
Duration: 27 Jun 20221 Jul 2022

Publication series

NameProceedings of ASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
Volume2

Conference

ConferenceASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
Country/TerritoryUnited States
CityWest Lafayette
Period27/06/221/07/22

Keywords

  • In-situ coaxial monitoring
  • Laser Powder Bed Fusion
  • Melt pool temperature
  • Two-wavelength imaging pyrometry

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