Investigating the Effect of Cementite Particle Size and Distribution on Local Stress and Strain Evolution in Spheroidized Medium Carbon Steels using Crystal Plasticity‐Based Numerical Simulations,Steel Research International

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Investigating the Effect of Cementite Particle Size and Distribution on Local Stress and Strain Evolution in Spheroidized Medium Carbon Steels using Crystal Plasticity‐Based Numerical Simulations
Steel Research International ( IF 1.9 ) Pub Date : 2020-11-26 , DOI: 10.1002/srin.202000407
Muhammad Umar _{1,

2} , Faisal Qayyum ₃ , Muhammad Umer Farooq ₁ , Liaquat Ali Khan _{1,

4} , Sergey Guk ₃ , Ulrich Prahl ₃

Affiliation

Herein, micromechanical material deformation behavior of medium carbon steel—with varying cementite particle size and distribution—under monotonic tensile load is modeled. The statistical phase morphology data are collected from the microscopy images of 83% spheroidized C45EC steel. Virtual microstructures for nine different cases are constructed using Dream.3D by varying the concentrations of small, large, and bimodal cementite particles on the ferrite grain boundaries. A crystal plasticity‐based numerical simulation model, i.e., DAMASK, is used to simulate the local material deformation behavior. The material model parameters for elastic–plastic ferrite and elastic cementite phases are adopted from the literature and calibrated by modifying the fitting parameters to match the experimentally observed material flow curve. It is observed that the cementite particle size and distribution in the primary phase affect the local mechanical behavior of the material. An analysis of deformation at 20% of global strain has helped in the qualitative understanding of factors affecting the stress and strain concentration points. The evolution of stresses and strains in the least and the most stressed representative volume elements (RVEs) has provided interesting information regarding the path followed by the dislocation movement during deformation. The study has provided insight into the factors affecting the material's global and local deformation behavior.

中文翻译：

使用基于晶体塑性的数值模拟研究渗碳体粒径和分布对球化中碳钢局部应力和应变演变的影响

在此，对碳钢的渗碳体粒径和分布变化的微机械材料在单调拉伸载荷作用下的变形行为进行了建模。统计相形态数据是从83％球化C45EC钢的显微镜图像中收集的。使用Dream.3D通过改变铁素体晶界上小的，大的和双峰渗碳体颗粒的浓度，构造了针对9种不同情况的虚拟微结构。基于晶体可塑性的数值模拟模型（即DAMASK）用于模拟局部材料的变形行为。从文献中采用了弹塑性铁素体相和弹性渗碳体相的材料模型参数，并通过修改拟合参数以匹配实验观察到的材料流动曲线进行了校准。观察到渗碳体的粒度和在第一相中的分布会影响材料的局部机械性能。对总应变的20％时的变形进行的分析有助于定性地了解影响应力和应变集中点的因素。应力最小和应力最大的代表体积单元（RVE）中应力和应变的演变已提供了有关变形过程中位错运动所遵循的路径的有趣信息。该研究提供了有关影响材料整体和局部变形行为的因素的见解。对总应变的20％时的变形进行的分析有助于定性地了解影响应力和应变集中点的因素。应力最小和应力最大的代表体积单元（RVE）中应力和应变的演变已提供了有关变形过程中位错运动所遵循的路径的有趣信息。该研究提供了有关影响材料整体和局部变形行为的因素的见解。对总应变的20％时的变形进行的分析有助于定性地了解影响应力和应变集中点的因素。应力最小和应力最大的代表体积单元（RVE）中应力和应变的演变已提供了有关变形过程中位错运动所遵循的路径的有趣信息。该研究提供了有关影响材料整体和局部变形行为的因素的见解。

更新日期：2020-11-26

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