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为研究35CrMnSi在强动载荷下的失效行为,通过弹道实验获得不同速度(0.469~1.280 km/s)下35CrMnSi破片侵彻钢板后的破坏模式,利用扫描电子显微镜(SEM)对失效断口形貌进行观察。结果表明:侵彻速度在0.469 km/s以下时,破片仅发生墩粗变形;在0.574~1.280 km/s时,破片发生断裂失效;大于0.574 km/s时,破片主要表现为脆性的解理型穿晶断裂,且断口存在局部融化、绝热剪切带、熔融韧窝和不规则的颗粒。
In order to study the failure behavior of 35CrMnSi under strong dynamic load, the failure modes of 35CrMnSi fragments penetrated into steel plates at different speeds (0.469 ~ 1.280 km / s) were obtained by ballistic experiments. The morphology of failure fracture was observed by scanning electron microscope (SEM) Observed. The results show that when the penetration rate is less than 0.469 km / s, only the coarse deformation of the pier occurs. At 0.574 ~ 1.280 km / s, the rupture failure occurs. When the velocity is higher than 0.574 km / s, the fragment shows brittle cleavage Type transgranular fracture, and the fracture there is local melting, adiabatic shear zone, molten dimples and irregular particles.