Abstract
Phase equilibria and microstructure control of sulfide in steel have been reviewed and discussed. The configuration of phase equilibria of metal- sulfide pseudo binary systems can be classified into four types based on invariant reactions and melting points of metal and sulfide. M1type:The monotectic reaction with two-liquid separation is present where the melting point of sulfide is lower than that of metal. M2 type:The two-liquid phase separation is present where the melting point of sulfide is higher than that of metal. E1 type:The eutectic reaction is present where the melting point of sulfide is lower than that of metal. E2 type:The eutectic reaction is present where the melting point of sulfide is lower than that of metal. The phase diagram of many metal-sulfide system shows misbility gap in liquid phase which is quite different with that of metal-carbide and metal-nitride systems. Typical microstructure of sulfides in steel is shown and the reiaion between the morphology of sulfide and the phase diagram is discussed. In addition, typical examples of the phase diagram application to the microstructure control of sulfides in steel are presented. The phase diagrams are expected to be useful for design of new sulfide dispersed steel.
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