High Temperature Deformation Behavior of Peritectic Carbon Steel during Solidification.

Phase dependence of tensile strength of Fe-C binary steel and peritectic carbon steel during and after solidification has been studied by a technique for high temperature tensile testing. The experimental technique enabled a sample to melt and solidify without a crucible, and the measurement of a minute load in a solidification temperature range became possible. A numerical model for the analysis of phase transformation during and after solidification was developed with the assumption that local equilibrium holds at liquid/solid interface or δ/γ phase interface.The zero strength temperature was in agreement with zero ductility temperature, and both of these temperatures appeared at the fraction solid of 0.8. Both the tensile strength and elongation of Fe-C binary steel were dependent on the phase state but not on carbon contents. The strain which seems to cause cracks in continuously cast steel slabs for the peritectic carbon steel is predicted to be generated during solidification.