Abstract
The article presents the importance of zirconium as an alloy addition introduced in different amounts into six cobalt cast alloys of MAR-M509 type. The tests concerning effect of various heat treatment processes on structural changes and mechanical properties are also presented. Based on the alloy structure observations by optical microscopy, TEM and diffraction pattern, as well as distribution of alloying elements using SEM with auxiliary energy device “Kevex-Ray” and Debye-Scherrer method, primary and secondary phases have been identified. It has found that zirconium resulted in vanishing of dendritic nature of the alloys, primary carbides refining, creating carbo-nitrides of M(C, N) type, strengthening of the alloy matrices, prohibiting the tendency to coarsening of secondary carbides Cr23C6 and increasing their creep strength.
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Opiekun, Z. Influence of zirconium and heat treatment on the structure of heat-resistant cobalt casting alloys of MAR-M509 type. J Mater Sci 22, 1547–1556 (1987). https://doi.org/10.1007/BF01132373
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DOI: https://doi.org/10.1007/BF01132373