Influence of Sulfur Content and Deformation Temperature on Precipitation Behavior of MnS in 3% Si Steel

Abstract

The precipitation behavior of MnS in 3% Si steel was investigated for understanding the metallurgical sequence of precipitation during hot rolling process in 3% Si steel. Precipitation was strongly accelerated by supercooling prior to aging or deformation even at high temperatures. Relatively large and inhomogeneously dispersed MnS precipitates were observed on subgrain boundaries and dislocations at higher temperatures. Fine and dense dispersed MnS precipitates were observed in the specimen deformed at lower temperatures. These fine precipitates were not always observed on dislocations. The precipitation behavior was strongly affected by S content. An increase in S content promoted fine precipitation. The precipitation rate estimated from classical nucleation model agreed with results at region of fine and dense precipitation.