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 language | English |
|---|---|
| Pages (from-to) | 637-649 |
| Number of pages | 13 |
| Journal | International Journal of Advanced Manufacturing Technology |
| Volume | 105 |
| Issue number | 1-4 |
| DOIs | |
| Publication status | Published - 2019 Nov 1 |
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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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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 journal › Article
TY - JOUR
T1 - Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L
AU - Ren, Chi Guang
AU - Lo, Yu Lung
AU - Tran, Hong Chuong
AU - Lee, Min Hsun
PY - 2019/11/1
Y1 - 2019/11/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85070902934&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070902934&partnerID=8YFLogxK
U2 - 10.1007/s00170-019-04193-0
DO - 10.1007/s00170-019-04193-0
M3 - Article
AN - SCOPUS:85070902934
VL - 105
SP - 637
EP - 649
JO - International Journal of Advanced Manufacturing Technology
JF - International Journal of Advanced Manufacturing Technology
SN - 0268-3768
IS - 1-4
ER -