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采用高能束局部淬火技术对金属柱壳进行预制破片,结合淬硬层组织和性能的变化特征,对内部爆炸载荷作用下壳体的动态断裂行为进行了研究,并将其与壳体自然破碎结果进行了对比。实验结果表明:壳体局部由于快速熔化-凝固导致相变,形成淬硬层,其组织主要为针状马氏体,晶粒细化,硬度提高约64%,但冲击功下降15.4%~35.0%,脆化倾向明显;淬硬层对剪切带形成敏感性有着明显影响,壳体基本沿淬硬层断裂并发生破碎,破片形状规则,质量范围为0.2g~0.3g的有效破片比重接近90%,远高于自然破碎的有效破片比重(35%)。
In this paper, the dynamic fracture behavior of the shell under internal explosion load was studied by pre-fragmentation of the metal cylinder shell by high-energy beam quenching technology combined with the microstructure and properties of the hardened layer. Made a contrast. The experimental results show that the shell partially changes phase due to rapid melting and solidification, forming a hardened layer. The microstructure of the shell is mainly acicular martensite. The grain refinement increases the hardness by about 64%, but the impact energy decreases by 15.4% -35.0 %, Brittle tendency obvious; hardened layer has a significant impact on the formation of shear zone sensitivity, the shell fracture along the hardened layer and the occurrence of fragmentation, fragment shape rules, the mass range of 0.2g ~ 0.3g effective fragment close to 90%, far higher than the proportion of the effective pieces of natural broken (35%).