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The effect of powder on cooling rate and melt pool length measurements using in situ thermographic techniques

Published

Author(s)

Jarred C. Heigel, Brandon M. Lane

Abstract

High-speed thermal cameras enable in situ measurement of the temperatures in and around melt pools generated during powder bed fusion processes. These measurements can be used to validate models, to monitor the process, and to better understand material transformations that occur during the process. Unfortunately, pre-placed powder layers complicate the measurement due to spatter and irregular surfaces that impact emissivity. The objective of this work is to present high speed thermographic measurements of single and multiple scan tracks on substrates with and without pre-placed powder and to discuss the impacts of powder on the measurement of melt pool length and cooling rate.
Proceedings Title
Proceedings of the Solid Freeform Fabrication Symposium
Conference Dates
August 7-9, 2017
Conference Location
Austin, TX
Conference Title
Solid Freeform Fabrication Symposium

Keywords

Additive manufacturing, powder bed fusion, thermography, temperature, melt pool length, cooling rate, emissivity, powder
Created August 9, 2017, Updated October 20, 2017