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Measurement of the densities of various cast refractory nickel-based and iron-based alloys; Influence of their chemical compositions and of the nature of the carbides if any

Thierry Schweitzer, PatriceBerthod

The density, a physical property of the alloys that is generally desired as low as possible when they are used in transportation (weight) or high speed centrifugal applications (mechanical stress), was measured in the case of several chromium-rich nickel-based and cobalt-based alloys containing different types of carbides. The results, simply obtained by the division of the mass by the volume both accurately measured on special samples, were given as average and standard deviation values. They confirmed for various microstructures that the {FCC matrix}-composed nickel-based alloys are denser that the {BCC matrix}-composed iron-based alloys. They additionally show that the presence of quantities of heavy elements Hf and Ta, and/or consequently of the corresponding dense MC carbides, leads to increases in density of almost +10% in some cases. This is to taken into account in the choice of such metallurgical mean for alloy structural strengthening, in addition to the increased in cost.