Alloy design criteria to produce ductile phosphoric irons have been proposed based on a detailed microstructural study of ancient Indian irons. The alloy design aims at avoiding phosphorus segregation to the grain boundaries by
soaking the phosphoric iron at high temperatures within the ferrite + austenite region to precipitate austenite allotriomorphs,
utilizing a critical amount of carbon to segregate to grain boundaries, and
precipitation of some of the phosphorus in solid solution in the ferrite matrix as fine coherent phosphide precipitates.
Volume 42 | Issue 6
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