Steel phase transformation in the CO2 laser hardening process

Authors

  • J. M. Amado Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • C. Ávarez Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • G. Nicolás Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • A. J. López Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • J. A. Pérez Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • A. Ramil Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • E. Saavedra Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • J. Sanesteban Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • M. J. Tobar Departamento de Ingeniería Industrial II. Universidad de La Coruña
  • A. Yáñez Departamento de Ingeniería Industrial II. Universidad de La Coruña

DOI:

https://doi.org/10.3989/revmetalm.2004.v40.i5.289

Keywords:

Laser hardening, finite element modelling, heat transfer.

Abstract


Hardening processes of steel are very dependent on the heating and cooling rates, in both cases high rates are needed. In the laser hardening the power density of the laser beam is responsible of the fast heating of the material; fast cooling is achieved due to the heat conduction from the region being treated to the bulk of the workpiece. Within this work thermal cycles are determined with a Finite Element Model which computes the temperature of the material during the laser treatment. For the prediction of the hardening IT diagrams are applied, isothermal steps are connected with constant volume fraction steps; the content of each phase is computed in the framework of the Johnson-Mehl and Avrami law. During the cooling process, a similar procedure is applied but now using TTT diagrams. Model validation is done comparing, on a local basis, microhardness measurement on a treated workpiece with the martensite concentration extracted from the model.

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Published

2004-10-30

How to Cite

Amado, J. M., Ávarez, C., Nicolás, G., López, A. J., Pérez, J. A., Ramil, A., Saavedra, E., Sanesteban, J., Tobar, M. J., & Yáñez, A. (2004). Steel phase transformation in the CO2 laser hardening process. Revista De Metalurgia, 40(5), 365–368. https://doi.org/10.3989/revmetalm.2004.v40.i5.289

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