Study of the Effect of Gas Nitriding Time on Microstructure and Wear Resistance of 42CrMo4 Steel
- 1 Laboratory Mechanics, Materials and Processes (LMMP) ENSIT, University of Tunis, Tunis, Tunisia
- 2 Laboratory Mechanics, Materials and Processes (LMMP) ENSIT, University of Tunis, Tunis, Tunisia
- 3 Laboratory Mechanics, Materials and Processes (LMMP) ENSIT, University of Tunis, Tunis, Tunisia
Abstract
Prior studies have noted that gas nitriding has a considerable effect for wear resistance. The aim of this paper is to study the influence of gas nitriding time (12, 24, 36 and 48 h) in the wear behaviour of 42CrMo4 steel. It has been assessed by micro hardness, pin-on-disc tribosystem, and SEM through the nitrided layer for each nitriding time. The study relates to the performance of the compound layer and the diffusion layer with respect to adhesive wear. The results were analyzed in terms of the weight lost during wear, for nitrided steel with and without the compound layer, and for untreated steel. It has been observed that wear rate varies as a function of the tests conditions due to the presence of different wear mechanisms. Thus, for short tests conditions wear rate depends on two mechanisms: plastic deformation and adhesive wear, whereas for large tests conditions the mechanisms controlling wear rate are abrasive and oxidative wear. Furthermore, this study contains an analysis of the wear mechanisms of a nitrided part, founded on scanning electron microscopy (SEM) observations of the wear traces at various stages of the evolution of wear. The SEM examination of worn surfaces revealed signatures for the adhesion, abrasion, delamination and tribochemical (oxidative) modes of wear. This is an important issue for future research.
- Zeghni, A.E. and Hashmi, M.S.J. (2005) The Effect of Coating and Nitriding on the Wear Behaviour of Tool Steels. Journal of Materiels Processing Technology, 155-156, 1918-1922.
- Straffelini, G., Avi, G. and Pellizzari, M. (2002) Trento: Effect of Three Nitriding Treatments on Tribological Performance of 42CrAlMo7 Steel in Boundary Lubrication. Wear, 252, 870-879.
- Yang, J., Liu, Y., Ye, Z., Yang, D. and He, S. (2011) Microstructural and Tribological Characterization of Plasma- and Gas-Nitrided 2Cr13 Steel in Vacuum. Materials & Design, 32, 808-814.
- Binder, C., Bendo, T., Hammes, G. and Klein, A.N. and de Mello, J.D.B. (2015) Effect of Nature of Nitride Phases on Sliding Wear of Plasma Nitrided Sintered Iron. Wear, 332-333, 995-1005.
- Terres, M.A., Sidhom, H., Larbi, A.B.C., Ouali, S. and Lieurade, H.P. (2001) Influence of the Resistance to Cracking of the Compound Layer on the Fatigue Strength of the Nitrided Components. Matériaux & Techniques, 89, 23-36. https://doi.org/10.1051/mattech/200189090023
- Terres, M.A., Bechouel, R. and BenMohamed, S. (2017) Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel. International Journal of Materials Science and Applications, 6, 18-27. https://doi.org/10.11648/j.ijmsa.20170601.13
- Alsaran, A. (2003) Determination of Tribological Properties of Ion-Nitrided AISI 5140 Steel. Materials Characterization, 49, 171-176.
- Wang, C.J. and Jaw, J.H. (2004) Study of Wear Behaviour of Nitride Layers Fe-Mn-Al-C Alloys. Surface and Coatings Technology, 177-178, 477-482.
- Baranowska, J., Franklin, S.E. and Pelletier, C.G.N. (2005) Tribological Behaviour and Mechanical Properties for Low Temperature Gas Nitrided. Wear, 259, 432-438.
- Manova, D., Hirsch, D., Richter, E., Mandl, S., Neumann, H. and Rauschenbach, B. (2007) Microstructure of Nitrogen Implanted Stainless Steel after Wear Experiment. Surface and Coatings Technology, 201, 8329-8333.
- Marchev, K., Cooper, C.V. and Giessen, B.C. (1998) Observation of a Compound Layer with Very Low Friction Coefficient in Ion-Nitrided Martensitic 410 Stainless Steel. Surface and Coatings Technology, 99, 229-233.
- Xia, Y., Wang, S., Zhou, F., Wang, H., Lin, Y. and Xu, T. (2006) Tribological Properties of Plama Nitrided Stainless Steel against SAE52100 Steel under Ionic Liquid Lubrication Condition. Tribology International, 39, 635-640.