Abstract
The present study reports on the kinetics of borided AISI D3 steel. Boriding thermochemical treatment was carried out in a solid medium consisting of B4C, SiC and KBF4 powders mixture at 1123, 1173 and 1223 K for 2, 4 and 6 h, respectively. The boride layer was characterized by optical microscopy, X-ray diffraction technique and micro-Vickers hardness tester. X-ray diffraction analysis of boride layers on the surface of the steels revealed the existence of FeB, Fe2B, CrB and Cr2B compounds. The thickness of the boride layer increased with an increase of the boriding time and the temperature. The hardness of the boride compounds formed on the surface of the steels ranged from 1652 to 1984 HV0.05, whereas Vickers hardness values of the untreated the steels was 608 HV0.05. The boron activation energy (Q) was estimated as equal to 174.261 kJ/mol for the borided AISI D3 steel. The growth kinetics of boride layers forming on the borided AISI D3 steel was also analyzed.
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