TRIBOLOGICAL PERFORMANCE OF PLASMA NITRIDED 42CRMO4 STEEL AT ELEVATED TEMPERATURE

1 Van Doan Thanh
Co-authors:
1 Pospichal Miroslav 1 Fajltejsek Petr 2 Thuan Nguyen Van
Institutions:
1 University of Defence in Brno, Czech Republic, EU
2 Le Quy Don Technical University, Hanoi, Vietnam
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1227-1233
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
44 views / 20 downloads
Abstract

This paper is focused on the tribological behaviour of the plasma nitrided 42CrMo4 steel at elevated temperature to 300 ºC. The hardened steel was treated in plasma in two variants of nitriding atmosphere: 24H2:8N2 and reverse ratio 8H2:24N2, which is greater nitrogen concentration. This leads to forming the nitriding layers with different phases, therefore, to distinct mechanical and tribological properties of nitride layers. The “ball on disc” wear test was performed at the variation of temperatures. A profilometer was used to investigate the wear track on the disk surface. Experimental results indicated that the coefficient of friction changed over the test time and temperature, and plasma nitriding in the atmosphere of 8 H2 : 24 N2 improved wear resistance better than nitriding in the atmosphere of 24 H2 : 8 N2. The results of wear test were further supplemented by measurement of surface roughness, metallografical documentation, layer thickness measurements, surface hardness and microhardness test.

Keywords: Plasma nitriding, wear resistance, coefficient of friction, elevated temperature, 42CrMo4

© 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.

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