论文部分内容阅读
本文通过电镜观察了断口断裂面变形组织和位错密度,并结合示波冲击负荷-时间曲线,研究了硫化物形态对16Mn钢板断裂行为的影响。这种影响是造成断口形貌与材料韧性不一致的原因。不加稀土16Mn钢宏观断口呈木纹状,无明显断口三要素,微观形貌为沿长条状硫化物界面断裂的脆性断裂机制。加稀土16Mn钢宏观断口多呈结晶状,有明显的断口三要素,放射区结晶颗粒的微观形态属准解理断裂机制。因此单凭宏观断口形貌是不能真实地反映断裂本质,而需结合断口的微观机制、根据断口三要素中纤维区和剪切唇所占比例来判断。
In this paper, the deformation microstructure and dislocation density of fracture surface were observed by means of electron microscope, and the influence of sulfide morphology on the fracture behavior of 16Mn steel was studied by combining with the shock load-time curve. This effect is caused by fracture morphology and material toughness reasons. The macroscopic fracture of 16Mn steel with no addition of rare earth is wood grain, and there is no obvious fracture of the three elements. The microscopic morphology is a brittle fracture mechanism along the interface of long strip sulfide fracture. The addition of rare earth 16Mn steel macroscopic fracture mostly crystalline, with obvious fracture of the three elements, the radiation zone crystalline particles microscopic morphology is a sub-cleavage fracture mechanism. Therefore, macroscopic fracture appearance alone can not truly reflect the nature of fracture, and the fracture mechanism to be combined with the micro-mechanism, according to the fracture of the three elements of the fiber region and the proportion of shear lip to judge.