Formability of High‐Alloy Dual‐Phase Cr‐Ni Steels

Abstract

The formability of dual-phase high-alloy Cr-Ni steel within the temperature range from 900 to 1250°C was studied using laboratory tensile and torsion tests. The dual-phase steels on 24% Cr basis are characterized by poor hot formability due to very low stable deformation values and slow recrystallization. Mathematical description of deformation stability exhaustion was derived, as well as a model of formability control based on analysis of the gradual diffuse deformation stability from the stability limit to the moment when the deformation starts to concentrate in a small volume of the test piece. Rolling simulation of dual-phase steel strip was used as an example demonstrating the draught scheme optimization technique which avoids the danger of crack occurrence during the rolling of dual-phase steel strip.

Austenite-Ferrite Transformation in Hot Rolled Mn-Cr-Mo Dual Phase Steels

“…Dual phase steels (DPS) are a class of structural materials used in the automotive industry for applications where a combination of high strength and high ductility is required [1][2][3]. These steels exhibit tensile strengths in the range 550-675 MPa and microstructures consisting of 5-30% hard martensite dispersed in a soft and ductile ferrite matrix [3].…”