Dislocation Based Flow Stress Model of 300M Steel in Isothermal Compression Process

Area of Science:

• Materials Science
• Metallurgy
• Mechanical Engineering

Background:

• Understanding microstructure-flow behavior is crucial for materials processing.
• Dislocation and recrystallization effects on flow stress at high temperatures remain poorly understood, hindering accurate predictions.
• Existing models often fail in predicting flow stress during high-temperature compression.

Purpose of the Study:

• To provide a novel explanation for the relationship between microstructure evolution and flow behavior.
• To investigate the influence of dislocation and recrystallization on flow stress.
• To develop and validate a dislocation-based flow stress model for 300M steel.

Main Methods:

• Development of a dislocation-based flow stress model.
• Application of the model to 300M steel under high-temperature compression conditions.
• Testing the model under both constant and variable strain rate conditions.

Main Results:

• The proposed dislocation-based model successfully predicted flow stress in 300M steel.
• Accurate predictions were achieved across a range of strain rates (0.01–10 s⁻¹) and temperatures (950–1150 °C).
• The model demonstrated efficacy under both constant and variable strain rate conditions.

Conclusions:

• The study offers a new perspective on microstructure evolution and its impact on flow behavior.
• The developed model enhances the understanding of hardening and softening mechanisms in 300M steel during hot compression.
• This research contributes to improved flow stress prediction in high-temperature metal forming processes.