PITTING WEAR MECHANISM OF NITRIDED 30CRMOV6 STEEL SAMPLES

1 FROCISZ Łukasz
Co-authors:
1 KRAWCZYK Janusz 1 ŚLEBODA Tomasz
Institution:
1 AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, A. Mickiewicza Av. 30, 30 – 059 Kraków, Poland, lfrocisz@agh.edu.pl
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
578-583
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
16 views / 6 downloads
Abstract

Nitrriding is a one of the processes which is used to increase material surface hardness. Nitrogen supersaturated layer on the material surface significantly decreases its friction coefficient. With decreasing friction coefficient an improvement of material wear resistance should be expected. It was proved in a numerous research works on sliding wear of nitrided layer. The changes of the microstructure in the surface of the nitrided material resulted in increasing its fatigue resistance, mostly due to residual compressive stresses introduced into the material surface during nitriding process. In this research the mechanism of one specific case of fatigue wear is described. The performed studies allowed to observe two different mechanisms of pitting wear initiation at the nitrided layer. One of them began with the formation of the pervious fatigue cracking at the material surface and in the case of second one the pitting wear was initiated at the subsurface area.

Keywords: Nitriding, surface layer, pitting wear, cracking, steel
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