摘要
超高强度钢靶板在聚能射流穿甲后损伤特征的研究表明,在穿甲过程中,弹孔周围白层的温度超过了相变点,形成了晶粒尺度在20nm左右的马氏体+残余奥氏体混合组织.绝热剪切带（ASB）中的剪切仅发生在相当窄的层面上,其宽度约为2μm,平均切应变量为110,应变速率≥2.24×106s-1;光学显微镜下显示的剪切带宽度是集中剪切变形区（LSDZ）及其热影响区（HAZ）的总宽度.聚能射流穿甲过程中,靶板材料破坏包含了如下几个相互重叠的过程:与射流接触的靶板周围局部区域材料沿射流方向上的整体协调变形;射流与靶板之间的剪切断裂和弹孔表面部分靶材的熔化;集中在极薄层面卜高度局域化的剪切变形;应力波在靶表面反射造成的正向开裂.
The characteristic and mechanism of damaging of ultra-high strength steel target penetrated by shaped charged jet are investigated. The results show that the temperature of the white etching layer near the punching hole of the target is above the transformation point during penetrating. So the mixing structure of the martensite and austenite with about 20 nm is formed. The severe shearing in the adiabatic shearing band (ASB) occurs only within 2 mum in thickness. The average shear strain of localizing shearing deformation zone (LSDZ) of a ASB is estimated as 110 and its minimum strain rate 2.24x10(6) s(-1). Usually the thickness of the ASB observed by miroscope consists of the LSDZ and its heat affect zone (HAZ). During the penetration of the shaped charged jet, several processes take place as follows: total flow plastic deformation near the punching hole along the direction of shaped charged jet moving, shearing fracture and partly melting of the target material on the interface between the target and shaped charged jet, shearing deformation located in a very narrow region as well as tensile fracture due to stress wave reflection on the surface of the target.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第11期1210-1214,共5页
Acta Metallurgica Sinica
基金
国家重点基础研究发展规划项目G19980615
自然科学基金项目59971058资助
关键词
损伤
聚能射流
穿甲
超高强度钢靶板
绝热剪切带
shaped charged jet
penetration
ultra-high strength steel target
adiabatic shearing bands
