|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||E-27: Constitutive Model for Dynamic Tensile Behaviour and the Dynamic Tensile Ductile Fracture Behaviour of Press-hardening Steels
||Xing Wei, Jianhua Mo
|On-Site Speaker (Planned)
In this work, both cold-rolled and CSP hot-rolled press-hardening steel sheet metal blanks were austenized and quenched at a same cooling rate about 37.5℃/s , which resulted in as-quenched microstructures with different fraction of Martensite and Ferrite, respectively. Then, the dynamic tensile test was conducted on these as-quenched steels and the dynamic tensile behaviour of both cold-rolled and CSP hot-rolled press-hardening steels at room temperature is interpreted by employing a modified Johnson-Cook model which taking the tensile damage into account. The model parameters are all reassessed base on local experiments, considering a strain rate from 10-3 to 103/s. The evolution of the ductile fracture is analysed by investigating the SEM and optical microscope images of the fracture surfaces under different strain rates, which revealed a transition in ductile fracture behaviour as the strain rate increased from 10-3 to 103/s.
||Planned: Supplemental Proceedings volume