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Metallurgical characterization and kinetics of borided 34CrNiMo6 steel

Ucar N., Yigit M., Calik A.

Advances in Materials Science

2020

Vol. 20, nr 4(66)

38--48

Boriding of 34CrNiMo6 steel was performed in a solid medium consisting of Ekabor-II powders at 1123, 1173 and 1223 K for 2, 4 and 6 h. Morphological and kinetic examinations of the boride layers were carried out by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thicknesses of the boride layers ranged from 22±2.3 to 145±4.1 depending on boriding temperature and time. The hardness of boride layer was about 1857 HV0.1 after boriding for 6 h at 1223 K, while the hardness of the substrate was only around 238 HV0.1. Growth rate constants were found to be between 1.2×10-13 – 9.8×10-13 m2/s depending on temperature. The activation energy for boron diffusion was estimated as 239.4±8.6 kJ mol-1. This value was comparable to the activation energies reported for medium carbon steels in the literature.