Forming of Steels in Mushy States
Abstract Semisolid or mushy-state processing permits a material to partially solidify before shape making operations. The understanding of material behavior in the mushy state is critical for better control of various semisolid processes. The aim of the present study is to experimentally quantify the deformation behaviours of steel in mushy states. Semisolid specimens under indentation and upsetting deformation were evaluated at various forming speeds and mushy states. The temperature of specimens was carefully controlled to correlate the solid phase content. It has been found that the deformation resistance of steel in a mushy state was dependent on the deformation rate and the solid phase percentage. The relaxation of steel and stress reduction at mushy states were also observed and discussed.