研究了控轧和正火的09MnNb钢低温下冲击断裂行为,通过不同温度下冲击试验的负荷-挠度曲线研究,证明两种状态的钢低温下均具有较高的抗撕裂能力。在脆性转变温度下的断裂是以解理-韧窝混合型断裂方式进行的。控轧钢具有混合的α晶粒——等轴的和冷加工拉长的α晶粒,并具有较高的位错密度;正火钢则是较细的等轴α晶粒,具有位错的胞状亚结构。正火钢的这种组织特征降低了有效α晶粒尺寸,并导致较高的低温冲击韧性。
The low-temperature impact fracture of controlled-rolled and normalized steel 09MnNb has been investigated. Data on the load-flexibilty plot after impact test at various temperatures show that the steel either controlled-rolled or normalized offers higher resistance to tearing. The fracture occurred below the ductilebrittle transition temperature is by cleavage with dimpled rupture. The controlledrolled steel has a mixed α-grain structure which consists of equiaxial α-grains and "cold-worked" elongated grains with higher dislocation density, while the normalized steel has finer equiaxial α-grains with cell substructure of dislocation, of which the effective size of a-grain may be reduced. This microstructure of normalized steel makes the improved low-temperature impact property possible.
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