- Conference date: 17–19 June 2009
- Location: Alcoy (Spain)
In order to improve the wear resistance of parts without affecting the softer, tough interior of the part, laser hardening offers many advantages. Compared to conventional processes, only a shallow layer of the metal part is heated by laser irradiation to just below the melting temperature, while the surrounding material remains at ambient temperature. Due to heat conduction into the bulk material, the surface will cool down as soon as the laser beam moves away. This self‐quenching creates a particularly fine‐grained martensitic micro structure with high hardness without causing fragileness of the base material. Notably lower distortions of parts avoiding costly rework are produced due to laser beam follows the contours precisely. Nevertheless, when part is thin and slim even the low distortion caused by the laser hardening can deeply affects the part ability to function fairly. In this paper a double treatment is proposed in order to recover the bending and bulging deformation induced by the thermal cycle and phase transformation. Both the numerical and experimental approaches were used in a synergic attempt to rapidly achieve the goal of minimizing the displacements to a steel laser‐hardened edge of a thin blade for fibers cutting application. The modeling parameters comprise geometries, laser characters, material properties and mechanical properties; the model was built by means of the finite element method. In order to validate the numerical model the experimental and numerical outputs were crosschecked. The numerical model built up for this demonstration is able to extend its predicting ability to a vast range of similar applications.
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