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- Title
Kinetics of borided gear steels.
- Authors
GUNES, IBRAHIM
- Abstract
In this study, the case properties and diffusion kinetics of GS18NiMoCr36 (GS18), GS22NiMoCr56 (GS22) and GS32NiCrMo6.4 (GS32) gear steels borided in Ekabor-II powder were investigated by conducting a series of experiments at temperatures of 1123, 1173 and 1223 K for 2, 4 and 6 h. 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, FeB, CrB and CrB compounds. The thickness of the boride layer increases by increasing boriding time and temperature for all steels. The hardness of the boride compounds formed on the surface of the steels GS18, GS22 and GS32 ranged from 1624 to 1905 HV, 1702 to 1948 HV, and 1745 to 2034 HV respectively, whereas Vickers hardness values of the untreated steels GS18, GS22 and GS32 were 335 HV, 358 HV and 411 HV, respectively. The activation energies (Q) of borided steels were 228.644 kJ/mol for GS18, 280.609 kJ/mol for GS22 and 294.359 kJ/mol for GS32. The growth kinetics of the boride layers forming on the GS18, GS22 and GS32 steels and the thickness of boride layers were also investigated.
- Subjects
ANALYTICAL mechanics; BORIDING; GEARING machinery; DIFFUSION; X-ray diffraction; BORIDES
- Publication
Sādhanā: Academy Proceedings in Engineering Sciences, 2013, Vol 38, Issue 3, p527
- ISSN
0256-2499
- Publication type
Article
- DOI
10.1007/s12046-013-0138-0