Dependence of martensite start temperature on fine austenite grain size

It has been broadly reported that determination of the martensite start temperature in steels, MsMs, requires a complete description of their chemical composition. Recently, several neural networks models considering both chemical composition and austenite grain size (AGS) have been developed. Such models predict a moderate dependence of MsMs with AGS. The present work examines the validity of existing neural network models, but focusing on fine AGS (below 5 μm).