低合金高强度钢的机械性能,特别是断裂时总延展性和夏比冲击韧性值,是受非金属夹杂物的体积百分比、形状和分布的影响。这些性能包括延性破断。在延性破断中,非金属夹杂物成为空穴长大和聚集形成主裂纹。这些空穴的萌核作用取决于夹杂物一基体界面的连接程度和夹杂物抗断裂的能力。整个作用在于,许多低合金高强度钢,特别是扁平轧材,在弯曲时呈现出撕断,在焊接时出现层状撕裂,不具有厚度方向的延展性。 The mechanical properties of low-alloy high-strength steels, particularly their total ductility at fracture and Charpy impact toughness, are affected by the volume percentage, shape and distribution of non-metallic inclusions. These properties include ductile breakage. In ductile fracture, non-metallic inclusions become cavities grow and aggregate to form the main crack. The germination of these holes depends on the degree of attachment of the inclusion-matrix interface and the ability of the inclusion to resist cracking. The whole effect is that many low-alloy high-strength steels, especially flat rolled products, show tear-off during bending, lamellar tearing during welding, and no thickness-wise ductility.