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Figure 2 shows the microstructure of NIMONIC*-80A and ASTROALOY* powders. The NIMONIC-80A pow*NIMONIC is a trademark of the INCO family of companies. ASTROALOY is a trademark of General Electric Company.

S.N. TEWARI and MAHENDRA KUMAR Gas atomization is now a well-established technique for producing superalloy powders. The microstructure of these powders is mostly dendritic. Secondary dendrite arm spacing (d) in cast alloys is known to vary with the local solidification time (t~) in the following manner: d a ( t , ) m, where m has been experimentally observed to be between 0.3 and 0.5. ~ Due to a low Biot number,

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