The microstructure and phase relationships in rapidly solidified type 304 stainless steel powders
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The Microstructure and Phase Relationships in Rapidly Solidified Type 304 Stainless Steel Powders RICHARD N. WRIGHT, JUNG CHAN BAE, THOMAS E KELLY, JOHN E. FLINN, and GARY E. KORTH The microstructure and relative amounts of fcc and bcc phases have been studied for rapidly solidified Type 304 stainless steel powders produced by vacuum gas atomization (VGA) and centrifugal atomization (CA). The VGA powder solidifies with a cellular microstructure while the CA powder has a dendritic microstructure. The volume fraction of fcc phase in the CA powder is found to increase from 40 pct to 97 pct with increasing particle size from 30 to 125/xm. In the VGA powder, the volume fraction of fcc phase is found to decrease from about 90 pct to 77 pct over the same range of particle sizes. The origins of the fcc and bcc phases in each powder are considered. It is concluded that bcc is present as both a primary crystallization phase in the smaller CA particles (
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