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Coatings 2017, 7(6), 77; doi:10.3390/coatings7060077

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

1
Laboratory for Machine Tools and Production Engineering (WZL), RWTH Aachen University, Steinbachstraße 19, 52074 Aachen, Germany
2
Aachen Center for Integrative Lightweight Production (AZL), RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen, Germany
3
Fraunhofer Institute for Production Technology IPT, Steinbachstraße 17, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Frank L. Palmieri
Received: 29 March 2017 / Revised: 22 May 2017 / Accepted: 2 June 2017 / Published: 7 June 2017
(This article belongs to the Special Issue Laser Surface Treatment)
View Full-Text   |   Download PDF [6340 KB, uploaded 7 June 2017]   |  

Abstract

Laser hardening is a surface hardening process which enables high quality results due to the controllability of the energy input. The hardened area is determined by the heat distribution caused by the intensity profile of the laser beam. However, commonly used top-hat laser beams do not provide an ideal temperature profile. Therefore, in this paper the beam profile, and thus the temperature profile, is optimized using freeform optics. The intensity distribution is modified to generate a top-hat temperature profile on the surface. The results of laser hardening with the optimized distribution are thereupon compared with results using a top-hat intensity distribution. View Full-Text
Keywords: laser hardening; intensity profile; top-hat; freeform optics; 42CrMo4; AISI/SAE 4240; 1.7225 laser hardening; intensity profile; top-hat; freeform optics; 42CrMo4; AISI/SAE 4240; 1.7225
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Klocke, F.; Schulz, M.; Gräfe, S. Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics. Coatings 2017, 7, 77.

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