钢管爆炸条件下绝热剪切带的作用和精细结构

研究钢管在爆炸加载条件下绝势剪切带的作用，结果表明绝热剪切带是在钢管动态膨胀过程中形成的，并在钢管破碎时成为断裂的通道，充当“预制”的作用，并用透射电镜观察了破片内绝热剪切带的业有细结构，绝热剪切带中心是等轴晶组织，这是动态再结晶的结果，带内发生动态再结晶表明绝热温升已经很高，它的软化使其成为钢管破碎时的断裂通道。

The Role and Microstructure of Adiabatic Shear Band on a Steel Tube Ballistically Loaded by Explosive

The role of adiabatic shear bands within fragments of tubular steel ballistically loaded by explosive is investigated. The results show that adiabatic shear band is formed during dynamic expansion of tubalur steel. The steel cylinder fractures preferentially along the adiabatic shear bands. Using transmission electron microscope, fine microstructure of adiabatic shear band within the fragments has been observed. Within the adiabatic shear band, the microstructure was seen to be comparatively complex. In the center of the shear band, the equiaxial grain microstructure was formed, which could be attributed to dynamic recrystallization. The occurrence of dynamic recrystallization in adiabatic shear band showed that adiabatic temperature rise in the shear band was very high, whose softening effect gave rise to steel cylinder fracturing preferentially along the adiabatic shear bands.