Research On Improve Fragmentation Performance Of The Projectile Shell Material Treat By Local Quenching

With the development of science and technology, the performance requirements ofprojectile shell are increasing, and traditional processing technology for the projectileshells has been unable to meet the demands of modern warfare. In order to improve thepower and efficiency of the projectile, we need to study on projectile shells material,projectile shells structure, ammunition energy, as well as improve the processingtechnology for projectile shells.This subject is starting from the processing technology of projectile shell, carrying outexperiments with high-energy beam control crushing technology. So-called high-energybeam control crushing technology takes the high-energy beam as a heat source, and thebrittle zone of projectile shell surface is rapidly heated to a molten state and change phase.Deep low-temperature metal makes surface melting metal cooled quickly and generatebrittle organization of projectile shell surface, that way, the brittle zone and matrix willproduce a performance difference and the brittle zone of projectile shell will crackpreferentially in the explosion, thus it will achieve controllable fragments with uniformquality and regular shape.In the experiments, the brittle belt of40Cr,50SiMnVB,58SiMn and the contrastingmaterial45#steel is processed by plasma arc, cross-flow CO₂laser and single-mode fiberlaser, then we design orthogonal test table and do the impact crusher experiment accordingto process parameters of three high-energy beams. Experiment results show that, all brokenare along the brittle belt and the energy required is significantly reduced in the destructionprocess no matter which method we use to process the brittle belt of projectile shell.With visual analysis of the orthogonal experiment results, this article obtains the bestprocess of three high-energy beam processing methods. It calculates the impact of variousprocess parameters on the experimental results by using orthogonal experiments andvariance analysis. The results show that, the processing parameters of high-energy beamare not prominent for experiment results. This article also analyzes embitterment mechanism of the brittle zone by SEM. The results show that the brittle belt of projectileshell material processed by different high-energy beam generates brittle organizationwithin a certain depth range and has no composition loss. In addition, this article alsomeasures the hardness of the brittle belt, the results show that the hardness of theprocessing area has substantial increase, and the hardness was diminishing stepped withthe depth of brittle belt increasing.