Abstract
This research work was conducted to characterize boride phases, obtained from the powder-pack process, on AISI H13 and D2 steel substrates, and investigate their tribological behavior. The boriding was developed at a temperature of 1273 K with an exposure time of 8 h. X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were conducted on the borided material to characterize the presence of the FeB, Fe2B, and CrB phases and the distribution of heavy elements on the surface of the substrates. The adherence of the boride layers was evaluated, in a qualitative form, through the Daimler-Benz Rockwell-C indentation technique. Sliding wear tests were then performed using a reciprocating wear test machine. All tests were conducted in dry conditions at room temperature. A frequency of 10 Hz and 15-mm sliding distance were used. The applied Hertzian pressure was 2.01 GPa. Scanning electron microscopy was used to observe and analyze the wear mechanisms. Additionally, the variation of the friction coefficient versus the number of cycles was obtained. Experimental results showed that the characteristic wear mechanism for the borided surface was plastic deformation and mild abrasive wear; for unborided substrates, cracking and spalling were observed.
Highlights
Maximum protection against wear and corrosion is becoming more and more important to a wide range of components
The aim of this work was to investigate the tribological behavior of boride layers, obtained from the powder-pack process deposited on AISI H13 and D2 steel substrates, tested in sliding conditions using a high-frequency reciprocating machine and a ball on disk contact configuration
The cross-sectional view of scanning electron microscopy (SEM) micrographs obtained on the borided AISI H13 and D2 steels at 1273 K for 8 h is shown in Figures 6 and 7, respectively
Summary
Maximum protection against wear and corrosion is becoming more and more important to a wide range of components. In the thermochemical treatment of steel, nitriding, surface and case hardening, and boriding are the most important processes. Boride layers have demonstrated a good performance in various tribological applications including abrasive, adhesive, fatigue, and corrosion wear.[1,2,3,4,5,6,7,8,9] Boride surfaces form a very dense and hard layer on the treatment surface. The boron atoms diffuse into the substrate resulting in the formation of mixed boride phases that are harder than other coatings.[10,11,12] At the beginning of the last
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