Constitutive Modeling of Mechanical Behavior of Metallic Materials with Nanocrystalline Surface Layer

Abstract:

A constitutive model, adopting the modified Khan, Huang and Liang (KHL) viscoplastic model to describe plastic deformation of metallic materials with different grain sizes in the range of nanometers to micrometers at different strain rates, was presented to simulate the mechanical behavior of iron sample with nanocrystalline surface layer. Stress-strain curve and yield stress of the iron sample were calculated by means of this model. Influence of grain size distribution in the cross section was also investigated. The simulation results indicate that the yield stress can be increased after the formation of the nanocrystalline surface layer. And an increment of the fraction of the nanocrystalline layer can improve the yield stress further.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2813-2817
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2813
• Online since: January 2013
• Authors: Yao Mian Wang, Cong Hui Zhang
• Keywords: Grain Size, Mechanical Property, Simulation, Strengthening, Surface Nanocrystallization

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DOI: 10.1016/j.msea.2011.12.085

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