Abstract
By both the Charpy V-notched impact and the projectile tests,we here investigated the dynamic fracture behavior of a recently developed ultrastrong lightweight steel comprising a hierarchical martensitic matrix,dispersed ultra-fine-retained austenite grains and oriented δ-ferrite lamellas,the latter being due to high Al and Si contents employed for low-density design.This steel shows a superior combination of specific ultimate tensile strength and impact toughness to other ultrastrong steels and has successfully arrested a real steel-cored bullet shot.These are attributed to the densely textured δ-ferrite lamellas that can deflect the propagating cracks until they are trapped and enclosed besides austenite-to-martensite transformation crack closure,leading to more energy consumed before failure.These results suggest a new pathway for toughening ultrastrong lightweight steels.
基金项目
National Natural Science Foundation of China(51831002)
National Natural Science Foundation of China(51904028)
National Natural Science Foundation of China(52233018)
China and Fundamental Research Funds for the Central Universities,China(06500151)
&&(201910244716.9 in China)
&&(US 10793932 in USA)
万方数据