Effect of Heat Treatment Hardening on the Dry Sliding Wear Behaviour of Mild Steel
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.72
Effect of Heat Treatment Hardening on the Dry Sliding Wear Behaviour of Mild Steel C.L. Lebudi 1 , R.R. Phiri 1*, T, Leso 1, O.P. Oladijo 1,2 1 Department of Chemical, Materials and Metallurgical Engineering, Botswana International University of Science and Technology, Palapye, Botswana
2 Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park, Kingsway Campus, Johannesburg, South Africa
Abstract:
Mild steel offers a variety of properties for various applications at lower costs giving the alloy a large application base in industry. However, the increasing complexity and severity of service environments has shifted the focus of many industries to structure modification techniques, like heat treatment, to improve material properties and performance. The focus of this paper was to therefore investigate the effect of heat treatment induced hardness on the sliding wear behaviour of mild steel. The results showed that resistance to dry sliding wear increased with increasing hardness of the mild steel samples. Both abrasive and adhesive wear mechanisms were observed to occur on the samples, however abrasive wear was predominant.
1.
Introduction
Heat treatment processes are often employed to develop various microstructural phases that develop desirable properties on metal components. Many industries have therefore adopted a number of these processes to enhance product performance and extend service life. Most of these processes are centred on hardening metal components, and considerable research has been made on the effect of hardness on friction and wear behaviour of different metals. Dubois and Belin-Ferré [1] observed that, in general, harder metals experience less friction than softer ones. Mokhtar [2], explained that this was due to the increased strength of interatomic bonds in harder metals consequently increasing resistance to adhesion hence resulting in lower frictional characteristics. Hardening of metal surfaces by heat treatment processes has also proved to lower friction and wear rates [3]. This was attributed to microstructural changes as a result of phase transformations, increased
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surface energy and internal residual stresses. Heat treatments that rapidly cool metals predominantly results in martensitic transformations. Mohamed et al. [4], reported that the nucleation of α׳-martensite in ductile steel resulted in a significant increase in hardness as well as lower coefficient of friction. Sahin’s et al. [5] work on the wear behaviour of austempered ductile irons with dual matrix structures, showed that resistance to wear was primarily influenced by the structure of the matrix and its hardness. Lower material losses during tribological contacts were obtained du
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