Effect of silicon on the structure and mechanical properties of high-vanadium cast iron
Journal Title: Archiwum Odlewnictwa - Year 2009, Vol 9, Issue 3
Abstract
The results of microstructural examinations and mechanical tests carried out on Fe-C-V and Fe-C-V-Si alloys solidifying in volumetric mode, containing 1,38-1,83%C, 6,76-14,72%V and 1,05-3,69 Si, have been reported. The eutectic crystallising in Fe-C-V alloys is composed of ferrite and vanadium carbides of the VC1-x type, and as such is included in the group of fibrous eutectics. Introducing silicon additions to the Fe-C-V system changes the geometry of the solidifying eutectic from fibrous to complex regular, and the shape of primary carbides from non-faceted dendrites to the faceted ones. It has been proved that the tensile strength Rm, proof stress R0,2, unit elongation A5 and hardness HV30 depend mainly on the type of alloy matrix. It has also been proved that adding silicon to Fe-C-V alloys may increase the hardness HV30 by about 24% and the tensile strength Rm by as much as 40%, with simultaneous 80% reduction of the unit elongation A5.
Authors and Affiliations
E. Fraś, M. Kawalec
Keywords
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