|Autors: Kaleicheva, J. A., Mishev, V. P., Karaguiozova, Z. K., Nikolcheva, G. I., Miteva A.|
Title: Effect of Nanoadditives on the Wear Behavior of Spheroidal Graphite Cast Irons
Keywords: Nanoadditives, Titanium nitrides, Titanium carbonitride, Austempered ductile irons, Wear resistance, Hardness, Structure, Bainite
Abstract: The tribological characteristics of spheroidal graphite cast irons with and without nanosized additives are investigated. The tests are performed as in cast iron condition as well after austempering. The spheroidal graphite irons are undergone to austempering in the bainite field, including heating at 900°C for an hour, after that isothermal retention at 280°C, 2 h and at 380°C, 2 h. The lower bainitic and upper bainitic structures are formed during the process. Nanosized additives of titanium carbonitride and titanium nitride TiCN+TiN influence on the graphite phase characteristics and on the microstructure of the cast and austempered spheroidal graphite irons. The changes in the micro structure the irons with nanoadditives lead to an abrasive wear resistance increase. The formation of the strain induced martensite from the retained austenite in the friction contact area during wear is determined in the austempered irons.
Copyright Faculty of Engineering, University of Kragujevac, Serbia
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Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus