In this paper, in order to improve the microstructure uniformity of an ultra-high strength martensitic steel with a greater than 2500 Mpa developed by multi-directional forging laboratory, single-pass hot compression experiment strain rate 0.01 1 s?1 and temperature 800 1150 °C was conducted. Based on experimental data, material parameters were determined, constitutive model considering influen...

The strength of any material is dependent on the grain size and percentage of volume fraction recrystallization. In this Paper, a new approach for controlling microstructure development during hot working process by percentage of volume fraction recrystallization is proposed. Here two different methods are employed. One of the approaches is based on the Optimal Control theory and involves the d...