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通过对余热处理和微合金化钢筋进行即时拉伸、时效后拉伸试验,研究两种钢筋断裂源及断口“鱼眼”的形成,分析了时效处理对试样力学性能的影响。结果表明:由基体塑性和夹杂物水平所代表的综合塑性,是试样裂纹源产生位置的决定因素。试样经时效后,强度下降、伸长率提高以及能够避免断口出现鱼眼,主要是因为去氢的作用。“鱼眼”的尺寸主要受夹杂物尺寸、基体的塑性以及裂纹扩展速度影响。
The effects of aging treatment on the mechanical properties of the samples were analyzed by means of real-time tensile test and post-aging tensile test of the residual heat treatment and microalloyed rebar, and the formation of two kinds of steel fracture sources and fracture “fish eyes”. The results show that the comprehensive plasticity, which is represented by the plasticity of the matrix and the inclusion level, is the decisive factor for the location of the crack source. After the aging of the sample, the strength decreased, increased elongation and to avoid fracture appears fisheye, mainly because of the role of hydrogen. The size of the “fisheye” is mainly influenced by the size of the inclusions, the plasticity of the matrix and the rate of crack propagation.