| Issue |
J. Phys. Colloques
Volume 48, Number C7, Décembre 1987
1st International Laser M2P Conference
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|
|---|---|---|
| Page(s) | C7-77 - C7-83 | |
| DOI | https://doi.org/10.1051/jphyscol:1987712 | |
J. Phys. Colloques 48 (1987) C7-77-C7-83
DOI: 10.1051/jphyscol:1987712
SIMULATION NUMERIQUE ET CONTROLE DE LA TREMPE SUPERFICIELLE DES ACIERS PAR LASER CO2
D. KECHEMAIR1 and E. LUNEVILLE21 Etablissement Technique Central de l'Armement, CTME/OP, 16 bis, Avenue Prieur-de-la-Côte-d'Or, F-94114 Arcueil Cedex, France
2 Ecole Nationale Supérieure des Techniques Avancées, Groupe Hydrodynamique Navale, Chemin de la Hunière, Batterie de l'Yvette, F-91120 Palaiseau, France
Abstract
A computing software has been developed to describe the CO2-laser surface hardening of steels. Under the assumptions that the laser energy is spread onto the surface, being afterwards absorbed by conduction, and that the martensitic transformation occurs without free interface, we solve the non-linear unsteady conduction equation with a two-dimensional finite element method. The influences of non-linearities of the material and laser energy distribution in the spot are pointed out. To obtain a deeper or more homogeneous hardened zone, we study the control of thermic cycles, using an optimisation of the laser energy distribution. We show some experimental results (temperature measurements by thermocouples) which qualitatively agree with the numerical results.