Abstract
Temperature distributions were measured during the irradiation of a CO2 laser beam at one end of a rod-shaped specimen and at the centre of a thin plate-shaped specimen. Regarding the measured temperature distributions as one-dimensional and two-dimensional unsteady state heat transfer solutions, CO2 laser beam absorptances were calculated using a modified finite difference method. Temperature dependence of thermal properties, heat loss due to convection and latent heat during melting of the specimen were taken into account in this numerical calculation. Increasing the specimen temperature from room temperature to melting point, absorptances of STS304 stainless steel and SM45C steel were calculated as 8 ∼ 40% and 6 ∼ 41% for the one-dimensional calculation, and as 9.3 ∼ 41% and 5 ∼ 41% for the two-dimensional calculation, respectively. These calculated absortances were very close to theoretical values at relatively low temperature, which were calculated from the electrical resistivities of the specimens. Increasing the temperature of the specimens, absorptances increased considerably due to oxidation of the specimens. Regardless of specimen composition and specimen dimension, both absorptances showed nearly the same value of 41% at their melting points, in which the structures of both metals became amorphous phases.
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References
T. J. Wieting and J. L. DeRosa, J. Appl. Phys. 50(2) (1979) 1071.
C. Banas, in “The Industrial Laser Annual Handbook”, edited by D. Belforte and M. Levitt (PennWell, Tulsa, OK, 1986) p. 69.
G. Herziger, ibid.“ p. 108.
I. Miyamoto, H. Maruo and Y. Arata, in “Laser Processing Fundamentals, Applications and System Engineering”, SPIE Vol. 668, edited by W. W. Duley and R. Weeks, (International Society of Optical Engineering, Bellingham, 1986). p. 11.
D. T. Swift-Hook and A. E. F. Gick, Weld. J. 52(11) (1973) 492.
A. S. Kaye, A. G. Delph and C. J. Nicolson, Appl. Phys. Lett. 43(5) (1983) 142.
D. W. Moon and E. A. Metzbower, in “Proceedings of the International Power Beam Conference, Columbus”, edited by E. A. Metzbower and D. Hausner, (American Society for Metals, Metals Park, OH, 1988) p. 125.
E. A. Metzbower, ibid.“ p. 141.
T. H. Kim and J. G. Kim, J. Mater. Sci. Lett. 11 (1992) 1263.
T. H. Kim, C. E. Albright and S. Chiang, J. Laser Appl. 2 (1990) 23.
K. C. Chong, MSc Thesis, Yonsei University, Seoul 1991.
B. Y. Yoo, MSc Thesis, Yonsei University, Seoul 1991.
F. P. Incropera and D. P. Dewitt, “Introduction to Heat Transfer” (Wiley, New York, 1985) p. 177.
J. Majumdar and W. M. Steen, J. Appl. Phys. 51(2) (1980) 941.
A. F. A. Hoadley, M. Rappaz and W. Zimmermann, Metal. Trans. B. 22B (1991) 101.
S. Kuo and Y. Le, Metal. Trans. A. 14A (1983) 2245.
J. P. Hong, “Numerical Analysis of Heat Conduction and Diffusion” (Bando Publishing Co. Seoul, 1991) (in Korean) p. 75.
R. D. Pehlke, A. Jeyarajan and H. Wada, “Summary of Thermal Properties for Coating Alloys and Mold Materials” (University of Michigan, 1982) p. 25.
R. E. Hummel, “Electronic Properties of Materials” (Springer-Verlag, 1985) p. 137.
W. W. Duley, “Laser Processing and Analysis of Materials” (Plenum, New York, 1983) p. 70.
Special Steels, (Collected data by KISCO, 1978) (in Korean).
T. H. Kim, J. Mater. Sci. Lett. 10 (1991) 400.
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Kim, T.H., Chong, K.C., Yoo, B.Y. et al. Calculation of CO2 laser beam absorptance as a function of temperature for steels by the numerical method. JOURNAL OF MATERIALS SCIENCE 30, 784–792 (1995). https://doi.org/10.1007/BF00356343
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DOI: https://doi.org/10.1007/BF00356343