弹丸膛内运动过程中弹带塑性变形的宏观与微观机理研究

弹丸膛内运动过程中，弹带承受高强度冲击载荷与高速摩擦，其高温条件下瞬态塑性变形的微观机理十分复杂。根据膛内载荷特征，基于金属材料学进行弹带塑性变形的微观机理研究，通过分析弹丸发射后的弹带硬度分布及组织演变规律，探索其宏观形变的细观与微观本质。研究表明，弹带挤进后具有明显的层状特征，硬度最高的表层纤维组织因剧烈摩擦而迅速升温并导致局部再结晶，弹带内部区域未发生大尺度形变，摩擦产生的表面金属熔化膜是抑制塑性变形向内层延伸的重要因素之一。

Research on Macroscopic and Microscopic Mechanism of Plastic Deformation of Bearing Band

In motion process of projectile in bore, its bearing band is subjected to the high strength impact loads and high-speed friction, and the microscopic mechanism of transient plastic deformation under high temperature is very complicated. According to the load characteristics in bore, the microscopic mechanism of plastic deformation was studied on the basis of metal material theory; the regulation of hardness distribution and microstructure evolution was analyzed; then, the microscopic nature of macroscopic deformation was explored. The research results show that the bearing band has obvious layered characteristics after extrusion; fibrous tissue on its surface is heated up quickly and recrystallized partly because of severe friction; the large scale deformation does not occur inside the bearing band; the melted metal membrane on the surface is an important factor to restrain the plastic deformation extend to the inner region.