Investigations of High Temperature Wear Mechanisms for Tool Steel Under Open-Sliding Contact
During hot working processes, working tools are subjected to severe conditions. Wear is one of the major life limiting factors of the hot working tools. The identification and understanding of the wear mechanism are extremely important for solving problems related to the hot working process. The ultimate aim of this paper is to assess some wear mechanisms of the tool steel used in hot drawing. The tribological tests were performed on high temperature pin-on-disc tribometer with an open-sliding contact for a simulation of hot-drawing process with a refreshed contact surface. The pin material was X40 CrMoV5 steel and the disc material was Fe 360B steel. Experiments were carried out for different disc temperatures ranging from room temperature to 800°C, a constant sliding speed of 50 rev/min and a constant normal load of 70 N. The evolution surface damage and oxides tribolayers have been investigated by SEM and EDS. The results have shown that an increase in test temperature facilitates the generation of oxide and assists in the compaction of the debris, thus producing a wear protective layer, and therefore, a reduction in friction coefficient.
Keywordsfriction high temperature open contact oxides tool steel wear
- 3.S. Pierzgalski and Q. Luo, Studies of High Temperature Sliding Wear of Metallic Dissimilar Interfaces, Tribol. Int., 2006, 38, p 812–823Google Scholar
- 4.P. Muñoz-Escalona, N. Díaz, and Z. Cassier, Prediction of Tool Wear Mechanisms in Face Milling AISI, 1045 Steel, J. Mater. Eng. Perform., 2012, 21, p 797–808Google Scholar
- 14.Z. Baccouch, R. Mnif, R. Elleuch, and C. Richard, Analysis of Friction, Wear and Oxidation Behaviour of X40CrMoV5/Fe360B Steel Couple in an Open-Sliding Contact, J. Eng. Tribol., 2014, 228, p 276–287Google Scholar
- 16.H. Kong, E. Yoon, and O. Kwon, Self-formation of protective oxide films at dry sliding mild steel surfaces under a medium vacuum, Wear, 1996, 181–183, p 325–333Google Scholar
- 18.O. Barreau, Etude du frottement et de l’usure d’acier a` outils de travail à chaud. Thèse à ` l’Institut NationalPolytechnique de Toulouse, 14 Décembre 2004Google Scholar