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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 4064208, 14 pages
https://doi.org/10.1155/2017/4064208
Research Article

The Adhesion of CrN Thin Films Deposited on Modified 42CrMo4 Steel

Faculty of Technology and Education, Koszalin University of Technology, Sniadeckich 2, 75-453 Koszalin, Poland

Correspondence should be addressed to B. Warcholinski

Received 29 August 2017; Accepted 22 October 2017; Published 24 December 2017

Academic Editor: Hiroshi Noguchi

Copyright © 2017 O. Lupicka and B. Warcholinski. 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

Here, the effect of adhesion of CrN hard coatings on modified 42CrMo4 steel substrate is presented. Modifications of the substrate are shot peening, nitriding, shot peening, and nitriding joined process. In the shot peening process, two variable process parameters were used: exposure time (t) and air pressure (p). The nitriding process was conducted in the following parameters: nitriding potential Np = 4.86, nitriding time tn = 3 h, and temperature process T = 530°C. Modified substrates were characterized by surface hardness HV5 and hardness profiles on the cross section of samples and by surface roughness parameters. On such prepared substrates, the CrN coating was deposited. The adhesion of CrN coating on modified substrates was defined by the scratch test. Chemical and phase composition of the films was determined using EDS method and X-ray diffraction, respectively. The surface hardness of deposited films was also defined. The substrate of 42CrMo4 steel without mechanical and heat treatment coated by hard CrN film was used as a reference.