Abstract
The Fe-20Mo-5Ni-0.12C alloy after hot rolling presented coarse precipitates with the following approximated composition: 56.30%Mo, 35.96%Fe, 1.68%C, 2.01%Ni and traces of W (0.54%). One may deduce that, in agreement with the chemical analysis, that the coarse precipitates are carbides of type M{sub 6}C where M is Fe or Mo. Ni and W are present as solid solution elements, and are preferentially dissolved in the {alpha} matrix. The precipitates are stable at temperatures as high as 1,250 C. They are ferromagnetic carbides and are responsible for the high Hc values of the alloy.
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