|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Strain Rate Dependence of Ductility and Austenite Transformation in Q&P Steels
||Christopher Barret Finfrock, Melissa Thrun, Trevor Ballard, Amy Clarke, Kester Clarke
|On-Site Speaker (Planned)
||Christopher Barret Finfrock
Retained austenite-containing quenching and partitioning steels demonstrate promising formability and strength-elongation combinations at a reasonable cost. However, further improvement of mechanical performance is contingent on our ability to more precisely control the transformation of retained austenite to martensite. Considering the multitude of factors that influence austenite transformation, optimizing stamping operations to prolong necking or fracture is a noteworthy challenge, particularly as deformation temperatures diverge from ambient conditions and strain rates exceed quasi-static rates. In this work, tensile tests of a C-Mn-Si quenching and partitioning steel were performed over a range of strain rates to evaluate the strain rate dependence of tensile elongation and austenite transformation. A reduction in the uniform and total elongation occurred with increasing strain rate, while the degree of retained austenite transformation was proportional to the imposed tensile strain. To elucidate this behavior, a review of strain rate dependence in advanced high strength steels was performed. Although the strain rate dependence of tensile ductility in quenched and partitioned steels has been reported in a few recent studies, no consensus exists about the austenite characteristics that result in such behavior. This suggests that additional characterization of austenite transformation may enable further optimization of stamping processes and vehicle crash behavior.
||Definite: At-meeting proceedings