Abstract
The new high strength, toughness and low density steel is a new generation of lightweight material with high protection, which is based on the theory of lattice dilution and lattice distortion and is manufactured by adding light elements to reduce its density. Furthermore, after impact process, the composite effects such as transformation induced plasticity (TRIP) effect, twinning induced plasticity (TWIP) effect, microbands induced plasticity (MBIP) effect and phase transformation precipitation occur in the microstructure. The specific strength and specific stiffness are better than those of aluminum, magnesium and titanium alloys, and the modulus is 3 times that of aluminum alloy and 2 times that of titanium alloy. Preliminary research shows that the application of low density steel in artillery system can greatly reduce the production cost. On the basis that all technical and tactical indexes meet the design requirements, it can realize lightweight, long-distance strategic delivery and battlefield real-time repair.
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