in: High Performance and Optimum Design of Structures and Materials Book, W.P. De Wilde, Vrije Universiteit Brussel, Belgium S. Hernández, University of A Coruña, Spain C.A. Brebbia, Wessex Institute of Technology, UK, Editor, WIT Press , London, pp.545-552, 2014
Powder metallurgy enables cost-effective production of powder metallurgy (PM)
parts with complex geometries in automotive applications. PM materials are also
extensively used for the production of components subjected to working
conditions giving rise to sliding, rolling or abrasive wear, such as gears or cams.
In this experimental study, Fe based pre-alloyed Astaloy 85Mo powder was used
in the production of the camshaft spur gear. The gas carburizing is carried out at
925°С for 3 hours. The camshaft spur gears were waited at 850°С for 1 hour to
reach the required carbon concentration. Oil hardening is carried out at 82°С,
soaking time is 30 min. The effect of gas carburizing on the microstructure,
density, hardness and wear properties of Astaloy 85Mo+0.5% graphite was
investigated. Furthermore, the microstructure characterization and worn surfaces
of camshaft spur gear were examined using a high magnification optical
Keywords: powder metallurgy, Astoloy 85Mo, gas carburizing, wear.