Study on the bendability and toughness of a 1 500 MPa cold-rolled martensitic sheet steel

摘要

Cold rolled martensitic sheet steels are achieving more and more applications in car-making because of their ultra-high strength and potential for weight reduction.The relatively lowplasticity of ultra-high strength martensitic steels might be a drawback for the applications in the aspects of forming and safety protection function and should be significantly noted.A 1 500 MPa grade cold rolled martensitic sheet steel has been studied to investigate the bendability at 90 degree bending and impact toughness as well as fracture surface morphology at various temperatures.Some discussions have been made basing upon the experiment data to get some understanding on the performance of the materials under various conditions and on howto make use of this kind of ultra high strength steel properly.