Metallurgical Characterization and Kinetics of Borided 34CrNiMo6 Steel

Author:

Ucar N.1,Yigit M.2,Calik A.3

Affiliation:

1. Süleyman Demirel University , Faculty of Arts and Sciences, Department of Physics , Isparta , Turkey

2. Süleyman Demirel University , Graduate School of Natural and Applied Sciences , Isparta , Turkey

3. Isparta University of Applied Sciences , Faculty of Technology, Mechanical Engineering, Isparta , Turkey

Abstract

Abstract 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.

Publisher

Walter de Gruyter GmbH

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