Hot Ductility Behavior in the Peritectic Steel after reheating and after in situ melting

摘要

Different methods have been employed to determine the hot ductility in steel. Although in situ melting produces a better simulation of the true casting conditions, reheating to a very high temperature can also generate viable HD information. In this work, the effect of very high temperature deformation was studied in order to alleviate the low HD problem, in a peritectic steel. Specimens were reheated to 1370°C and then the HD was quantified at temperatures ranging from 700 to 1100°C by performing tensile tests. The HD trough was plotted under two conditions; with and without deformation applied in the very high temperature region of single phase austenite. It was observed that such deformation improved the HD and the extent of improvement varied with hot ductility test temperature. No change in the segregation pattern was observed after application of this very high temperature deformation, but there was a grain refinement to which the HD improvement is attributed.