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Advances in Tribology
Volume 2016, Article ID 8106410, 15 pages
http://dx.doi.org/10.1155/2016/8106410
Research Article

Tribological Behavior of Laser Textured Hot Stamping Dies

1Department of Manufacturing and Materials Engineering, School of Mechanical Engineering, University of Campinas, 13083-970 Campinas, SP, Brazil
2Department of Mechanical Engineering, School of Engineering of Sao Carlos, University of Sao Paulo, 13566-590 Sao Carlos, SP, Brazil

Received 30 November 2015; Accepted 6 March 2016

Academic Editor: Patrick De Baets

Copyright © 2016 Andre Shihomatsu et al. 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.

Abstract

Hot stamping of high strength steels has been continuously developed in the automotive industry to improve mechanical properties and surface quality of stamped components. One of the main challenges faced by researchers and technicians is to improve stamping dies lifetime by reducing the wear caused by high pressures and temperatures present during the process. This paper analyzes the laser texturing of hot stamping dies and discusses how different surfaces textures influence the lubrication and wear mechanisms. To this purpose, experimental tests and numerical simulation were carried out to define the die region to be texturized and to characterize the textured surface topography before and after hot stamping tests with a 3D surface profilometer and scanning electron microscopy. Results showed that laser texturing influences the lubrication at the interface die-hot sheet and improves die lifetime. In this work, the best texture presented dimples with the highest diameter, depth, and spacing, with the surface topography and dimples morphology practically preserved after the hot stamping tests.