Abstract
The present study reports on characterization of borided AISI 316L stainless steel implant. Boronizing heat treatment was performed on a cylindrical bar of AISI 316L austenitic surgical stainless steel with a diameter of 2 mm and a length of 10 mm using slurry salt bath consisting of borax, boric acid and ferro-silicon. The susbstrate AISI 316L was essentially containing 0.022 wt% C, 0.79 wt% Si, 1.6 wt% Mn, 0.25 wt% P, 0.002 wt% S, 15.30 wt% Cr 14.09 wt% Ni, 2.63 wt% Mo and 0.05 wt% Cu, respectively. Boronizing treatments were conducted at 850°C, 900°C, 950°C, and 1000°C, for 2, 4 and 6 h, respectively. Depending on process time and temperature, the thickness of boride layer formed on substrate ranged from 12 to 40 μm. The hardness of borides formed on the surface of substrate was over 1500 VHN. The presence of borides (e.g. Fe 2B, CrB, Ni 3B) formed on the surface of borided AISI 316L stainless steel was confirmed by classical metallographic technique combined with X-ray diffraction analysis. The distribution of alloying elements was determined by means of energy dispersive X-ray spectroscopy spectrum from surface and line-scan analysis from surface to interior.
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