2 kW cw Nd:YAG laser surface hardening

G. Duffet; P. Kirat; H. Andrzejewski; A. B. Vannes

doi:10.1117/12.270180

4 April 1997 2-kW cw Nd:YAG laser surface hardening

G. Duffet, P. Kirat, H. Andrzejewski, A. B. Vannes

Proceedings Volume 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1997) https://doi.org/10.1117/12.270180
Event: XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, 1996, Edinburgh, United Kingdom

Abstract

Some classical surface hardening methods require a new machining after treatment or a break in line machining. The laser surface hardening allows the user to avoid these disadvantages. Moreover the associated Nd:YAG laser optical fiber enables the user to become independent of the piece geometry: in our case, an extrusion screw. In order to control the depth quenched by Nd:YAG laser beam, a temperature-field fast calculation based on the knowledge of the laser-material interaction parameters, of the laser power, of the scanning speed and of the material thermal diffusivity and conductivity is proposed. The method is applied to iron-chromium and to iron-nickel-chromium alloys. Quenched depth measurements on four steels lead to experimental results in good agreement with the proposed model. The hardening zone is characterized by hardness, structure, Young's modulus and yield stress. Notably an original way is used to know thermal affected zone. Young's modulus and yield stress: Hertzian hardness.

Citation Download Citation

G. Duffet, P. Kirat, H. Andrzejewski, and A. B. Vannes "2-kW cw Nd:YAG laser surface hardening", Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); https://doi.org/10.1117/12.270180

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