CC BY
6The 30th International Conference on Advanced Laser Technologies LM-P-1
ALT'23
Modelling of the temperature field during continuous source laser treatment
S.I. Yaresko1, S.N. Balakirov1, I.A. Antoshin2
1Samara Branch of P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 221 Novo-Sadovaya Str., Samara 443011, Russia 2Samara State Technical University, 244Molodogvardeyskaya Str., Samara 443100, Russia
E-mail address: ilyaantoshin [email protected]
The determination of the temperature field during the hardening treatment of parts by a moving laser source was realized by the finite element method (FE) in a 3D-formulation using the ANSYS Workbench software product and Moving Heat module. The developed parametric mathematical model makes it possible to describe the laser treatment (LT) of samples of various sizes made of materials with different thermo physical properties, using laser radiation (LR) of various power levels, beam diameter and scanning speed of the laser beam. The type of analysis is Transient Thermal with automatic selection of the number of substeps. The size of the FE mesh for the basic material was set to 0.5 mm, for the LT zone - 0.05 mm with a gradient decrease of the size of the FE. The depth of the laser hardening zone (LHZ) in the model was estimated taking into account the fact that the temperature of the end of the austenitic transformation shifts to higher temperatures [1]. For the class of steels under consideration, the temperature shift is assumed equal to 110°C. The heating source was modeled by supplying a Heat Flux in the form of a round spot of LR with a normal radiation intensity distribution. In the model, this was realized in the form of three circles nested into each other, with the ratio of intensity of LR in them corresponding to the normal distribution. To reduce the calculation time, the property of symmetry with a plane of model symmetry along the traj ectory of LR motion was used. The verification of model was conducted with the following fixed parameters: the beam diameter was 1.7 mm; the intensity distribution of LR was constructed as follows: 68.26 % of the LR power was distributed in the area of a circle with a diameter of 0.56 mm, 27.18 % - in a circle with a diameter of 1.12 mm, 4.28 % - in a circle with a diameter of 1.7 mm.
on the left - the result of measuring the depth of the LHZ in the cross section, on the right - the results of the calculation Fig. 1. Comparison of the LHZ depth according to metallography data and according to the FE method calculation for the AISI A290C1M steel after LT (P=100 W; V=5 mm/s)
The developed FE model of calculating the temperature field during laser heating by a moving concentrated source was used to calculate the temperature field for the laser treatment of AISI E3310, A290C1M, 4140, 5135 steels and chrome vanadium cast iron at variations in the power and scanning speed of the laser beam (Fig. 1). The discrepancy between the experimental and calculated values of the LHZ depth at the laser treatment does not exceed 14 %.
Thus, the FE model of calculating the temperature field of the LHZ of structural steels can be used to predict the LHZ depth and to develop a technology of hardening laser treatment from the point of view of assigning of a specific material's LT mode.
[1] A.G. Grigoryants, I.N. Shiganov, A.I. Misyurov. Technological processes of laser processing (Publishing House of Bauman Moscow State Tech-
nical University, 2006)
