The present work is dealing with three Si-steel alloys. Representative samples were taken and machined from
the as- cast ingots to suite the thermo mechanical simulator. The physical simulation process consists of heating to 1100
oC and then subjected to 5- consecutive hits with different strain at a strain rate 10 sec-1. It was found that the alloys
suffer from two contradictory phenomena. The 1st one is dynamic softening due to high strain rate and/or low
deformation temperature, while the 2nd phenomenon is the Si sold solution hardening effect. Low Si-content shows
pronounced dynamic softening at low deformation temperature (850 oC) after high (0.44) strain. Medium Si-content
appears dynamic softening during the early deformation hits at 1000 oC and 0.25 strain and continues up to 950 oC and
0.4 strain, after which hardening appears again. High Si-content launches no pronounced softening during deformation,
however, Si sold solution hardening effect becomes prevailing.
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