Composite layers fabricated by in situ technique in iron castings
Ewa Olejnik, Andrzej Janas, Andrzej Kolbus, Beata Grabowska
Quarterly No. 2, 2011 pages 120-124
DOI:
keywords: composite layers, in situ composite, SHS reaction, synthesis TiC, iron casting
abstract The paper presents the results of studies on the development of 3 to 6 x 10(-3) m thick composite layers in iron castings. The said layers are formed by an SHS reaction that occurs between the substrates, i.e. titanium and carbon, introduced into the mould. outcome is the synthesis of TiC carbides in a liquid alloy, where the hardness of these layers is 1950 MHV and the size ranges from 2 to 10 x 10(-6) m. Within the layer, locally coagulated clusters are formed. The stoichiometric mixture of titanium and carbon powders introduced to the mould, provokes changes in the alloy solidification conditions. This was confirmed by a DTA analysis, the results of which have indicated a change in the chemical composition of the alloy and local temperature rise in the reaction zone, amounting to 85 K respective of the remaining part of the casting.