Experimental Analysis of Tribological Processes in Friction Pairs with Laser Borided Elements Lubricated with Engine Oils.

Janusz Lubas,Paweł Woś,Wojciech Szczypiński-Sala,Krzysztof Miernik,Edyta Zielińska

doi:10.3390/ma13245810

Janusz Lubas, Paweł Woś + Show 3 more

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https://doi.org/10.3390/ma13245810

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Abstract

The present study discusses the influence of engine oils on the tribological parameters of sliding couples with laser borided surface layer. The borided layer was formed on specimens made from AISI 5045 steel by laser remelting of a surface layer coated with amorphous boron. The sliding friction and wear process was carried out on the pairs with AISI 5045 steel and SAE-48 bearing alloys which were lubricated with 5W-40 and 15W-40 engine oils. The investigation showed significant differences in the friction coefficient and temperature in the tested pairs with the laser borided surface layer. In the couples lubricated with 5W-40 engine oil, the tested parameter of friction was higher than in the couples lubricated with 15W-40 engine oil. The couples lubricated with 5W-40 engine oil showed more intensive wear of SAE-48 bearing alloy in contact with the laser borided surface layer than the pairs lubricated with 15W-40 engine oil. The laser borided surface layer used in friction pairs leads to the destruction of the lubricating properties of engine oils and reduces its resistance to scuffing.

Highlights

The structural elements of machines are subjected to various unfavorable operating factors that shorten their service life, which, in turn, affects the reliability of the entire structure
The aim of the present study is to investigate the influence of the selected classes of engine oils on friction and wear processes in friction pairs containing elements with laser borided surface layer
The surface roughness of the SAE-48 bearing alloy and laser borided ring specimen shows tendencies to increase and a greater change was observed in the pairs lubricated with 5W-40 engine oil

Summary

Introduction

The structural elements of machines are subjected to various unfavorable operating factors that shorten their service life, which, in turn, affects the reliability of the entire structure. The friction pairs used in internal combustion engines are exposed to an intensive destruction processes caused by the abrasive wear, adhesion, oxidation and cavitation processes. The intensity of these processes is influenced by the structure of the friction pair, materials of the friction elements, surface treatment, loading and lubrication conditions. In the case of most components operating under frictional conditions, a surface layer of high hardness and wear resistance is required. Sometimes, they require increased fatigue resistance, corrosion resistance, heat resistance and creep resistance.

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