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Influence of carbides and of the dendritic orientation on the thermal expansion of Ni-base, Co-base and Fe-base simple cast alloys

Abstract Knowing how chemical composition and microstructure can influence the thermal expansion of high temperature alloys is of great importance. The behaviour of pure Ni, Co or Fe and of simple 30 wt.% Cr-containing cast alloys based on these elements, carbide-free or containing 0.8 wt.% C, were studied between 500°C and 1200°C. Special attention was given to the possible effect of the carbide and of the dendrite orientation. Thermal expansion coefficients are provided and compared with regard to the microstructure. The presence of Cr in the alloys leads to higher thermal expansions than for pure elements. The interdendritic carbides tend to reduce the alloys' thermal expansion behaviour by obstructing the allotropic dimensional phenomena or by plastically deforming the matrix in compression. The dendritic orientation seems to influence the thermal expansion of carbide-containing alloys.