Study on the Mechanical Behavior of Quenching and Partitioning Sheet Steel and Its Application to Stamping of a Hinge Pillar Inner Panel

Quenching and partitioning steel is a recently developed low-alloy material with retained austenite meeting the requirements to high strength ductility. The basic mechanical properties of QP980 are derived through static uniaxial tensile tests, trend plasticity strain rate obtained by dynamic tests. ultimate reaches 1050.67 MPa, which only about 50 MPa higher than that DP980. And highest elongation 0.2 observed at lowest (1. 3 × 10-4 s-1 ). applied stamping hinge pillar inner panel an SGM car. good formability verified real die experiments DP980 QP980, respectively. results indicate safe during process, while cracked. has properties, its performance much better DP980, meets stamping.