Effects of Austempering and Martempering Heat Treatments on wear Behavior of Cr-Mo Steels (FMU-226) Used in Mills Liner

Document Type : Research Paper

Authors

Abstract

In order to investigate the effect of heat treatment on wear characteristics of Cr-Mo wear resistant steel, the specimens were austempered and martempered at 300oC and 200oC respectively for 2, 8, 30, and 120 minutes and the wear properties of the specimens were compared with those observed in common cycle in industry (compressed air quench). Dry sliding wear tests have been conducted using a pin-on-disk machine under different normal loads of 57.8, 81.3 and 104.8 at a constant sliding speed of 1.20 m/s. The scanning electron microscope (SEM) and X- ray diffraction (XRD) analysis of surface and wear debris of specimens shows that wear mechanism was mainly mild oxidative in all samples, however, delamination and plasticity-dominated wear mechanisms have been seen in high loads. The friction, wear rate and wear coefficient of the steels, have been explained with respect to microstructure and the wear mechanism. The comparison of wear rates shows that by using austempering and especially martempering process, wear resistance of this steel increases considerably.   

Keywords

References

1-       Banisi, S. & Hadizadeh, M. (2007). 3-D liner wear profile measurement and analysis in industrial SAG mills. Minerals Engineering, 20(2), 132-139.
2-       Cleary, P. W. (2001). Recent advances in DEM modeling of tumbling mills.Minerals Engineering, 14(10), 1295-1319.
3-       Fu, H., Xiao, H. & Fu, H. (2005). Heat treatment of multi-element low alloy wear-resistant steel. Materials Science and Engineering A, 396, 206-212.
4-       Hertzberg, R. W. (1996). Deformation and fracture mechanics of engineering materials. John Wiley & Sons Inc.
5-       Hutching, I. M. (1992). Tribology and wear of engineering materials. Edward Arnold, 82-171.
6-       Keough, R., Laird, W. J. & Goddin, A. D. (1991). Austempering of steel. ASM Metal Handbook, Heat Treatment, 4, 367-413.
7-       Lim, S. C. & Ashby, M. F. (1987). Wear-mechanism maps. Acta Metallurgical, 35, 1-24.
8-       Olsen, D. L. & Cross C. E. (1992). Friction and wear in the mining and mineral industries. ASM Metal Handbook, Friction, Lubrication, and Wear Technology. 18, 1327-1342.
9-       Shaeri, M. H., Saghafian, H. & Shabestari, S. G. (2012). Effects of austempering and martempering processes on microstructure and mechanical properties of Cr-Mo steels (FMU-226) used in mills liner. Materials and Design, 34, 192-200.
10-   Shaeri, M. H., Saghafian H. & Shabestari, S. G. (2010). Effects of austempering and martempering processes on amount of retained austenite in Cr-Mo steels (FMU-226) used in mills liner. Journal of Iron and Steel Research International, 17(2), 53-58.
11-   Stott, F. H. (1998). The role of oxidation in the wear of alloys. Tribology International, 31, 61-71.
12-   Suh, N. P. (1973). The delamination theory of wear. Wear, 25, 111-124.
13-   Zhi-qiang, J., Jian-ming, D. & Xi-lan, F. (2006). Study and application of heat treatment of multi-element wear-resistant low-alloy steel. Journal of Iron and Steel Research International, 13(1), 57-61.

Files

History

  • Receive Date: 23 September 2014
  • Accept Date: 23 September 2014

Share

How to cite

Statistics