Abstract
The spray-dispersion method, which produces a metal containing homogeneously dispersed fine oxide particles sprayed from outside into the molten metal stream, was applied to HASTELLOY* X and Ni−Cr−W alloy. The condition of the dispersion of ZrO2 particles and the mechanical properties were examined for ZrO2 dispersed alloys. The addition of a dispersion controlling element, Nb or Ta, was found to be effective for decreasing the average particle diameter of sprayed particles and for increasing the volume fraction of the particles. Ultimate tensile strength and 0.2 pct proof strength were increased by ZrO2 particle dispersion. And creep strength of ZrO2 particle dispersed alloys was greater than that of non-dispersed ones. From these results, the production of oxide dispersed nickelbase heat resistant alloys has been established by the spray-dispersion method.
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