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通过对热轧16Mn钢板纵、横、厚向断口的大量观察,从硫化物形态、断口形貌和断裂机制之间的相互关系着手,分析了钢板塑性和韧性各向异性的原因。各向断裂中硫化物形态、断裂方式和断口形貌的对应关系与夹杂物/钢基交界面分离原理相一致。沿轧制方向伸长的硫化物夹杂在钢板的各向断面里具有不同的形态,因而构成不同形状、尺寸和数量的硫化物/钢基界面。在延性断裂过程中,这些交界面抵抗裂纹形成和扩展的能力不同,从而导致断裂方式和断口形貌的差异,造成钢材塑性和韧性的各向异性。
Through extensive observation of the longitudinal, transverse and thickness fracture of hot rolled 16Mn steel, the causes of the plasticity and toughness anisotropy of the steel sheet are analyzed from the relationship between the shape of sulfide, the fracture morphology and the fracture mechanism. The correspondence of sulfide morphology, fracture mode and fracture morphology in each direction fracture is consistent with the separation principle of inclusion / steel interface. Sulfide inclusions elongated in the rolling direction have different morphologies in the cross-section of the steel sheet, thus forming sulfide / steel-base interfaces of different shapes, sizes and numbers. In the ductile fracture process, the ability of these interfaces to resist the formation and propagation of cracks is different, leading to the difference of the fracture mode and fracture morphology, resulting in the plasticity and toughness anisotropy of the steel.