Effect of Sub-Zero Treatment on the Wear Resistance of P/M Tool Steels
Sobotova J*, KuÅík M,, Krum S and Lacza J
Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo nám 13, 121 35 Prague 2, Czech Republic
- *Corresponding Author:
- Sobotova J
Faculty of Mechanical Engineering
Czech Technical University in Prague
Karlovo nám 13, 121 35 Prague 2, Czech Republic
E-mail: [email protected]
Received date: November 07, 2016; Accepted date: December 05, 2016; Published date: December 10, 2016
Citation: Sobotova J, KuÅík M,, Krum S, Lacza J (2016) Effect of Sub-Zero Treatment on the Wear Resistance of P/M Tool Steels. J Appl Mech Eng 5:243. doi: 10.4172/2168-9873.1000243
Copyright: © 2016 Sobotova J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Sub-zero treatment of tool steels is included within the cycle of conventional heat treatment. This kind of heat treatment has been reported to improve wear resistance of tools. The improvement is attributed to precipitation of fine carbide particles, but is depending on a number of the other factors as well. This paper follows the previous works, in which the effect of sub-zero treatment on the mechanical and structural properties of P/M tool steels was evaluated. Two types of P/M cold work tool steels were used in the research: Vanadis 6 and high speed steel Vanadis 30. They were austenitized, nitrogen gas quenched and tempered. The 4 hours long sub-zero period of dwell at -196°C was also incorporated between quenching and tempering. Wear evaluation was carried out using a pin-on-disk method. The observed values of wear resistance have been collated with the values of hardness and the bending strength. The results of the work are supplemented by a detailed analysis of the carbide particles of both monitored conditions.