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Microstructure and selected properties of hot-work tool steel with PVD coatings after laser surface treatment

Microstructure and selected properties of hot-work tool steel with PVD coatings after laser surface treatment

Authors :
L. A. Dobrzański
Marcin Adamiak
Source :
Applied Surface Science. 254:4552-4556
Publication Year :
2008
Publisher :
Elsevier BV, 2008.

Abstract

The paper presents the effect of HPD laser treatment on the microstructure and selected properties of the PVD CrN, (Ti,Al) and Ti(C,N) coatings deposited onto hot-work tool steel substrates. The microstructure and surface topography of the investigated samples are characteristic of the diversified morphology connected with the applied laser beam power. Employment of laser beam at 0.7 kW power to the laser treatment of samples with Ti(C,N) coatings causes clear coating adhesion growth because of the diffusive processes induced by heat release. Because of the higher value of the (Ti,Al)N absorption coefficient one can state that the observed substrate materials change and finally coatings destruction in case of those samples is the most noticeable. The moderate effect of the laser beam treatment of the hot-work tool steel with the PVD coating was observed for CrN coatings. However, for laser beam power above 0.5 kW differences in the thermal expansion coefficients of the substrate materials and coatings generate coating crackings.

Details

ISSN :
01694332
Volume :
254
Database :
OpenAIRE
Journal :
Applied Surface Science
Accession number :
edsair.doi...........b151076827ca2318b73157865843fab5
Full Text :
https://doi.org/10.1016/j.apsusc.2008.01.091