Abstract
In the present study, the effects of the boriding process on adhesion and tribological properties of AISI 310 steel were investigated. Boriding was performed in a solid medium consisting of Ekabor-II powders at 1123 and 1323K for 2 and 6 h. The boride layer was characterized by optical microscopy, the X-ray diffraction technique and the micro-Vickers hardness tester. The X-ray diffraction analysis of the boride layers on the surface of the steels revealed the existence of FexBy, CrxBy and NixBy compounds. Depending on the chemical composition of substrates, the boride layer thickness on the surface of the AISI 310 steel was found to be 56.74 μm. The hardness of the boride compounds formed on the surface of the AISI 310 steel ranged from 1658 to 2284 HV0,1, whereas the Vickers hardness value of the untreated steel AISI 310 was 276 HV0,1. The wear tests were carried out in a ball-disc arrangement under a dry friction condition at room temperature with an applied load of 10N and with a sliding speed of 0.3 m/s, at a sliding distance of 1000m. The wear surfaces of the steel were analyzed using an SEM microscopy and X-ray energy dispersive spectroscopy EDS. It was observed that the wear rate of unborided and borided AISI 310 steel ranged from 4.57 to 71.42 mm3/Nm.
Highlights
Boriding is a thermochemical surface hardening process which occurs with the diffusion of boron atoms on the matrix surface
The efficiency, durability and reliability are improved by reducing friction and wear rate via certain materials, surface modifications and lubricants [6,7,8].The need to overcome wear is an old and well recognized problem that presents a unique challenge to the designer and the developer of steel components for many engineering applications, for example in crushing mills, sieves, shaft pins, skip hoist elements, conveyors, blades, gear and sprocket wheels, self-dumping cars elements, loading machines, trucks, front casting bulldozers, buckets and worm transporters
The main objective of this study was to investigate the effect of the boriding process on wear behavior of borided AISI 310 steel
Summary
Boriding is a thermochemical surface hardening process which occurs with the diffusion of boron atoms on the matrix surface. The main advantage of boronizing metals is the possibility to alloy a high surface hardness with a low friction coefficient. This may lead to good wear resistance. The wear and friction behaviors of borided steels are broadly dependent on the following surface and boriding conditions: boriding time and temperature, chemical composition, mechanical properties, physical structure, lubricant, surface roughness, etc. As result of these conditions, the life of machine components may be affected. Structural, Daimler-Benz adhesion test and tribological properties were investigated using optical microscopy, XRD, SEM, EDS, microhardness tests and a ball-on-disc tribotester
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