Kiyoshi Mizuuchi1, Yoshihira Okanda1 and Itsuo Ohnaka2
1Osaka Municipal Technical Research Institute, Osaka
The rotating-water-atomization process was applied to produce rapidly solidified Fe-30Cr-5Al alloy powders. The size distribution and the mean particle diameter decreased with increasing water-layer velocity. The particle shape was not spherical but tear-drop like. The oxidation of the particle surface was increased with the addition of Ce and also with increasing water-layer velocity. However, in the case of atomizing in Ar atmosphere, the oxidation could be decreased to less than one-half of that in Ar atmosphere. The obtained structure of the as-atomized particles was quite fine and became much finer with the addition of the Ce. A little grain growth by annealing was observed. It is suggested that the ductility of this alloy is improved by rapid quenching and the corrosion resistance against molten salt of this alloy by rapid quenching is as good as that of the as-cast condition.
iron-chromium-aluminum alloy, cerium addition, grain size, metallic powder, rapid solidification, process, rotating water
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