壳体材料性能对预控破片威力的影响

摘要

采用局部淬火技术对40Cr和40CrMnSiB壳体进行预制破片。考察了淬硬层组织和冲击功变化特征，最后分析了壳体材料性能对预控破片威力的影响规律。研究结果表明：由于瞬间的重熔－凝固作用，两种壳体的淬硬层组织主要为针状马氏体，晶粒细化但冲击功下降，脆化倾向明显。40CrMnSiB钢由于较好的淬透性和强韧性匹配，局部淬火后材料的韧性优于于40Cr钢，有利于壳体发生大幅度膨胀变形，使预控破片获得更多的动能，造成更强的破坏作用，与破片威力实验结果相吻合。%The cases of 40Cr and 40CrMnSiB steel were performed by local quenching technology, of which the microstructure and impact energy of hardened layers were analyzed, and the influence of case material on controlled fragmentation performance was also researched.Due to the instantaneous remelting-solidification process, the mi-crostructure of hardened layers is mainly needle martensite, which is more fine and brittle than case material.With a better comprehensive performance and hardenability, the toughness effect of 40CrMnSiB steel with local quench-ing is higher than 40Cr steel.Subjected to an internal explosion, the case of 40CrMnSiB steel can expand outwardly to the utmost extent, so the preformed fragments could obtain more energy and increase damaging effect, which is agreed with the lethality experiments.