中文摘要：

为了进一步了解金属动态塑性变形时的微观组织演化情况,该文对射流侵彻后钢靶的应变及温度变化进行了探讨。该文通过对铁素体宽度的测量,估算出侵彻孔壁附近钢的应变,由此可将侵彻后的钢分为动态超塑性变形层、大塑性变形层、小塑性变形层和基体。动态超塑性层的温度及晶粒度的计算结果得到了扫描电镜照片的证实。研究结果表明射流侵彻后钢靶的不同区域发生了不同类型的塑性变形,由此也引起了力学性能及微观结构的不同。

英文摘要：

In order to further understand the revolution of metal microstructures during dynamic plastic deformation,the strain and temperature change of steel target penetrated by a copper jet is investigated.Strains of a steel near a penetration channel wall are calculated based on measuring the width of ferrites and the steel near the penetration channel wall can be divided into dynamic superplastic deformation layer,large deformed layer,small deformed layer and normal matrix.The temperature of dynamic superplastic deformation layer and the calculated results of grain size are proven by scanning electron microscope images.The results show that different types of plastic deformation take place in different areas of steel targets penetrated by a copper jet,thereby causing dissimilarity of mechanical properties and microstructure.