Effect of hydrostatic extrusion on mechanical properties of trip steels
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Hydrostatic extrusion increases the deformability of TRIP steels, which simplifies the treatment but retains the good combination of mechanical properties.
Good mechanical properties of TRIP steels are obtained by warm hydrostatic extrusion (250°), ensuring large reductions (75%): σ0.2=180 kg/mm2, σb=200 kg/mm2, δ=10%. Hydrostatic extrusion at room temperature permits reductions of only 44%, which leads to lower strength characteristics —σ0.2=150 kg/mm2, σb=174 kg/mm2 — although δ=34%.
Tempering of hydrostatically extruded TRIP steels leads to a substantial improvement in the strength and ductile characteristics. The best combination of properties is obtained with tempering at 550° after warm hydrostatic extrusion with 75% reduction: σ0.2=190 kg/mm2, σb=220 kg/mm2, δ=35%.
Stress—strain diagrams were analyzed and the effect of the martensitic transformation on the mechanical properties of TRIP steels was demonstrated.
KeywordsMechanical Property Martensitic Transformation Substantial Improvement Large Reduction Good Combination
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