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Material Sciences 2021
基于位错密度的Ti-6Al-4V合金表面机械碾磨晶粒细化模型及工艺优化
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Abstract:
基于Johnson-Cook本构模型，采用Abaqus有限元分析软件，建立了Ti-6Al-4V钛合金表面机械碾磨工艺的二维有限元仿真模型，并将其与位错密度演化模型进行耦合，实现了对表面机械碾磨过程中受力情况与微观晶粒细化动态演变的仿真模拟。基于仿真结果，对钛合金表面机械碾磨过程中的残余应力场、应变场、位错密度和晶粒尺寸的变化规律进行了研究，得到了碾磨速度和单道次碾磨深度两种工艺参数对钛合金表面机械碾磨过程中晶粒细化程度的影响规律，为钛合金表面机械碾磨处理工艺参数的优化提供了有利参考。
Abaqus commercial finite element analysis software is used to establish a two-dimensional finite element simulation model of Ti-6Al-4V titanium alloy surface mechanical grinding process based on the Johnson-Cook constitutive model. The model is coupled with dislocation density evolution model to simulate the dynamic evolution of the macroscopic force and the microscopic grain refinement during the surface mechanical grinding treatment. Based on the simulation results, the changes in the residual stress field, strain field, dislocation density and grain size during the mechanical grinding of the titanium alloy surface were studied. The influence of two process parameters, grinding speed and single-pass grinding depth, on the degree of grain refinement during mechanical grinding of the titanium alloy surface is obtained. It provides a favorable reference for the optimization of the process parameters of the mechanical grinding treatment of the titanium alloy surface.
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