Precipitation behavior and inhibition effect of MnS, MnSe and AlN in 3% Si steel

The precipitation behavior of MnS, MnSe and AlN in 3% Si steel was investigated for understanding inhibition of grain growth under isothermal annealing. It became clear that the precipitation of AlN was greatly influenced by that of MnSe. The precipitates became fine when hot-rolled at low temperature, and therefore the grain size after the recrystallization annealing became small. Similarly, the grain size after the isothermal annealing became small when the precipitates became fine. When MnS or MnSe precipitates formed complex with AlN, Ostwald ripening was suppressed, as a result, grain growth was inhibited.