An experimental apparatus with cooling system and pressure-adj ustment assembly for simulating quench-ing was constructed to investigate the effect of contact pressure on the microstructures and mechanical properties of hot-stamping parts.Qualitative and quantitative analyses of the microstructures of the as-quenched parts were con-ducted;moreover,hardness and tensile tests were performed to measure their mechanical properties.The results in-dicated that contact pressure during quenching strongly affected the structures and performances of hot-stamping components.An excessive low contact pressure led to insufficient martensitic transformation.The critical contact pressure for complete martensitic transformation for 4.0 mm 22MnB5 steel was 0.4 MPa when the temperature of the coolant was 20 ℃.However,in consideration of the efficiency of practical production,a contact pressure higher than 1.25 MPa is recommended.
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