Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L

Chi Guang Ren, Yu Lung Lo, Hong Chuong Tran, Min Hsun Lee

Research output: Contribution to journalArticle

Abstract

Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1%. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.

Original languageEnglish
Pages (from-to)637-649
Number of pages13
JournalInternational Journal of Advanced Manufacturing Technology
Volume105
Issue number1-4
DOIs
Publication statusPublished - 2019 Nov 1

Fingerprint

Pyrometers
Melting
Stainless steel
Calibration
Lasers
3D printers
Pyrometry
Heat transfer
Color
Powders
Temperature
Powder metals
Thermocouples
Temperature measurement
Laser beams

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

Cite this

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title = "Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L",
abstract = "Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1{\%}. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.",
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Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L. / Ren, Chi Guang; Lo, Yu Lung; Tran, Hong Chuong; Lee, Min Hsun.

In: International Journal of Advanced Manufacturing Technology, Vol. 105, No. 1-4, 01.11.2019, p. 637-649.

Research output: Contribution to journalArticle

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