纳米Cu析出相及晶界对微合金化钢力学性能的影响

doi:10.12066/j.issn.1007-2861.1748

Abstract

Abstract:

Based on the elastic plastic finite element method, a microalloyed steel model of tension including Cu precipitation is constructed. This model is introduced into the finite element analysis of tension of microalloyed steel by changing the microstructure of Cu precipitation and grain boundary. Uniaxial tensile tests are conducted under different sizes of Cu precipitation and grain, and various values of the strain. Equivalent strain-stress curves are obtained. Strengthening mechanism is learned by analyzing the distribution of stress and strain. The results show that excellent ductility takes place at the center of Cu precipitation. Both intra-granular plasticity and its strain rate are better than grain boundary. In addition, a tension test of polycrystal model contained Cu precipitation and
grain boundary also shows compatible deformation of grain boundary.

Key words: Cu precipitation, grain boundary, mechanical property, microstructure, microalloyed steel

LI Zhi1,2, HU Lijuan1,2, XIE Yaoping1,2, ZHAO Shijin1,2. Effect of Cu precipitation and grain boundary on mechanical properties of microalloyed steel[J]. Journal of Shanghai University（Natural Science Edition）, 2017, 23(3): 432-442.

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Effect of Cu precipitation and grain boundary on mechanical properties of microalloyed steel

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