Thermal Cycling Simulation during Remelting Process of the Steel ASTM A743-CA6NM

Abstract:

This study aimed to model numerically the thermal cycling resulting from the steel ASTM A743-CA6NM remelting process. The problem was solved with the support of the commercial software ANSYS / FLUENT ® 14.5 for the three-dimensional case using the finite volume method. The following simplifying assumptions were adopted: heat loss by natural convection, absence of radiation, no phase change, concentrated heat source, and thermophysical properties independent of temperature. The results were analyzed for two different current intensities: 90A and 130A, and compared with experimental measurements. The peak temperatures of the thermocouples near the fusion line for the current of 130A were well represented by the numerical model, with a maximum deviation of 9.62%. In the case of the more remote thermocouples from the fusion line, the best results were obtained for the current of 90A, not exceeding 5% of deviation. In general, it was found that the tested body is heated faster than in simulations. This can be considered as a consequence of the simplification in material properties, which were assumed constants with temperature. The results of this study demonstrate that, given the adopted simplifications, the numerical model was able to satisfactorily reproduce the experimentally measured thermal cycles.

• Periodical: Advanced Materials Research (Volume 1082)
• Pages: 100-105
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1082.100
• Online since: December 2014
• Authors: Camila Almeida Martins*, Jhon Jairo Ramirez-Behainne
• Keywords: Finite Volume Method (FVM), Numerical Simulation, Remelting Process, Thermal Cycling

References

[1] Rosenthal, D., 1946. The theory of moving sources of heat and its application to metal treatments. Transactions of the American Society of Mechanical Engineers, Vol. 68, p.849 – 866.

DOI: 10.1115/1.4018624

[2] Wells, A. A., 1952. Heat Flow in Welding. Welding Journal, Vol. 31, n. 5, pp. 263s-267s.

[3] Adams Jr, C. M., 1958. Cooling rates and peak temperatures in fusion welding. Welding Journal, Vol. 37, n. 5, pp. 210s-215s.

[4] Chuansong, W., Zhenning, C., Lin, W., 1993. Numerical analysis of three-dimensional fluid flow and heat transfer in TIG weld pool with full penetration. Acta MetallurgicaSinica, Series B, Vol. 6, n. 2, pp.130-136.

[5] Kim, I. S., Basu, A., 1998. A mathematical model of heat transfer and fluid flow in the gas metal arc welding process. Journal of Materials Processing Technology, Vol. 77, pp.17-24.

DOI: 10.1016/s0924-0136(97)00383-x

[6] Wahab, M. A., Painter, M. J., 1997. Numerical models of gas metal arc welds using experimentally determined weld pool shapes as the representation of welding heat source. International Journal of Pressure Vessels and Piping, Vol. 73, pp.153-159.

DOI: 10.1016/s0308-0161(97)00049-5

[7] Hong, K., Weckman, D. C., Strong, A. B., 1998. The influence of thermofluids phenomena in gas tungsten arc welds in high and low thermal conductivity metals. Canadian Metallurgical Quartely, Vol. 37, n. 3-4, pp.293-303.

DOI: 10.1179/cmq.1998.37.3-4.293

[8] Wahab, M. A., Painter, M. J., Davies, M. H., 1998. The prediction of the temperature distribution and weld geometry in the gas metal arc welding process. Journal of Materials Processing Thechnology, Vol. 77, pp.2333-239.

DOI: 10.1016/s0924-0136(97)00422-6

[9] Fassani, R. N. S., 2001. Modelamento Analítico e numérico da transferência de Calor no Processo de Soldagem com Múltiplos Passes. PhD. Thesis, Universidade Estadual de Campinas, Campinas, SP. Brazil.

DOI: 10.47749/t/unicamp.2001.206671

[10] Gery, D., Long, H., Maropoulos, P., 2005. Effects of welding seed, energy input and heat source distribution on temperature variations in butt joint welding. Journal of Materials Processing Technology, Vol. 167, pp.393-401.

DOI: 10.1016/j.jmatprotec.2005.06.018

[11] Goldak, J., Chakravarti, A. Bibby, M., 1984. A new finite element model for welding heat sources. Metallurgical.

DOI: 10.1007/bf02667333

[12] Attarh, M. J., Sattari-Far, I., 2011. Study on welding temperature distribution in thin welded plates through experimental measurements and finite element simulation. Journal of Materials Processing Technology, Vol. 211, pp.688-694.

DOI: 10.1016/j.jmatprotec.2010.12.003

[13] Oliveira, F. R., 2011. Análise da influência dos parâmetros de refusão no ciclo térmico de revestimentos Fe-Cr-Mn-Si aspergidos e refundidos. Trabalho de Conclusão de Curso Bacharelado em Engenharia Mecânica, Universidade Tecnológica Federal do Paraná. Ponta Grossa, PR, Brazil.

DOI: 10.14488/encep.9786588212004.131-138

[14] Jhaveri, P., Moffat, W. G., Adams Jr, C. M. The effect of plate thickness and radiation on heat flow in welding and cutting. Welding Journal, v. 41, n. 1, p. 12s-16s, January (1962).