高密度W-(FeCrNi)合金动态变形微观组织及力学行为  

Dynamic deformation microstructure and mechanical behavior of high-density W-(FeCrNi)alloy

作　　者：陈慧[1,2] 李必鑫 韩勇 陈超[2] CHEN Hui;LI Bixin;HAN Yong;CHEN Chao(School of Physics and Chemistry,Hunan First Normal University,Changsha 410205,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]湖南第一师范学院物理与化学学院,长沙410205 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2025年第2期597-606,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52371041);湖南省自然科学基金资助项目(2024JJ6173)。

摘　　要：发展新型高密度钨合金材料是当前穿甲弹芯技术的重点研究方向,合金在高应变速率下的动态力学性能是评估其穿甲效能的核心指标之一。本文利用分离式霍普金森压杆(SPHB)实验系统,测试不同钨含量W-(FeCrNi)合金的动态压缩应力-应变曲线,结合扫描电镜(SEM)表征动态压缩前后微观组织演变规律;通过分析绝热剪切带(ASB)的形成特征及剪切断口形貌,揭示合金的高速剪切断裂机制;基于Johnson-Cook模型建立动态本构方程,系统探讨钨含量对合金形变强化和应变强化能力的影响机制。结果表明:离散分布的球状钨颗粒对W-(FeCrNi)合金的剪切变形不断产生阻碍作用;随着钨含量的增加,合金动态压缩屈服强度提高,而断裂应变降低;75W-(FeCrNi)合金绝热剪切变形带宽度约为50μm。The development of novel high-density tungsten alloy is a critical research focus in advancing armorpiercing projectile core technology.The dynamic mechanical properties of alloys under high strain rates serve as a pivotal indicator for evaluating their penetration performance.In this study,dynamic compressive stress-strain curves of W-(FeCrNi)alloys with varying tungsten contents were obtained using a Split Hopkinson Pressure Bar(SPHB)experimental system.The microstructural evolution before and after dynamic compression was characterized via scanning electron microscopy(SEM).By analyzing the formation characteristics of adiabatic shear bands(ASBs)and shear fracture morphologies,the high-speed shear fracture mechanism of the alloy was elucidated.A dynamic constitutive equation was established based on the Johnson-Cook model to systematically investigate the influence of tungsten content on the deformation strengthening and strain hardening capabilities of the alloy.The results demonstrate that discretely distributed spherical tungsten particles significantly impede the shear deformation of the W-(FeCrNi)alloy.With the increase of tungsten content,the dynamic compressive yield strength of the alloy improves,while the fracture strain decreases.75W-(FeCrNi)alloy exhibits an ASB width of approximately 50μm.

关 键 词：高密度钨合金 W-(FeCrNi)合金 激光定向能量沉积(L-DED) 动态微观结构演变 高应变速率力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]