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针对高锰TRIP钢、纯Cu、IF钢及装甲钢,利用Hopkinson杆在应变率为103~104s-1进行动态压缩实验,考察其抗冲击性能及剪切带形成时微观组织的差异.结果表明:动态剪切变形下,纯Cu和IF钢不易形成绝热剪切带,缺乏加工硬化能力,从而抗冲击性差;具有马氏体组织的装甲钢快速形成绝热剪切带,但剩余强度高,抗高速冲击性强;以奥氏体为主的TRIP钢有最高的加工硬化性,形变中产生的bcc马氏体(α′-M)可有效推迟绝热剪切带的产生且裂纹不易扩展,适于作为抗冲击材料.纯Cu及IF钢扩展的剪切组织为拉长的亚晶和小角晶界,剪切微织构弱,而TRIP钢及装甲钢绝热剪切带为细小的等轴晶和大角晶界,TRIP钢形成较强的{111}-{112}<110>fcc剪切微织构,装甲钢则形成弱的{110}<111>bcc剪切微织构.
For high manganese TRIP steel, pure Cu, IF steel and armor steel, Hopkinson rod was used to conduct dynamic compression test at strain rate of 103 ~ 104s-1 to investigate its impact resistance and microstructure difference in shear band formation. : Dynamic shear deformation, pure Cu and IF steel is not easy to form adiabatic shear zone, the lack of work hardening ability, resulting in poor impact resistance; armor steel with martensitic rapid formation of adiabatic shear band, but the remaining strength, resistance High-speed impact resistance; TRIP steel mainly austenite has the highest work hardening, bcc martensite (α’-M) produced during deformation can effectively delay the adiabatic shear band and the crack is not easy to expand, suitable As an impact material, pure Cu and IF steels have extended shear structures with elongated subgrain and small-angle grain boundaries with weak shear-weave texture, while TRIP and armor adiabatic shear bands are fine equiaxed And the large-angle grain boundaries, TRIP steel forms strong {111} - {112} <110> fcc shear micro-texture and armor steel forms weak {110} <111> bcc shear micro-texture.