Flow Stress Behaviour and Static Recrystallization Characteristics of Hot Deformed Austenite in Microalloyed Medium-Carbon Bainitic Steels

In the past decade, efforts have been focused on developing very fine, medium-carbon bainitic steels via low-temperature (typically 300–400 °C) ausforming process, which not only enables shorter isothermal holding times for transformation at low temperatures, but also offers significantly improved strength. This paper describes static recrystallization (SRX) characteristics of austenite in four 2%Mn-1.3%Si-0.7%Cr with and without microalloying intended development these steels. The stress-relaxation method a Gleeble simulator resulted over wide range strains strain rates. Also, occurrence precipitation was revealed. Powers (?1.7 to ?2.7) rate (?0.21 ?0.28) as well apparent activation energies (225–269 kJ/mol) were ranges reported literature C-Mn microalloyed lower Mn Si contents. new regression equations established estimating 50% SRX revealed retardation effects Mo addition showing reasonable fits experimental data, whereas previous model suggested ordinary tended predict clearly average than values present coarse-grained Boratto equation estimate non-recrystallization temperature successfully modified include effect alloying high silicon concentrations.