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首页> 外文期刊>ISIJ international >Crystal Plasticity Analysis Considering Dislocations’ Behavior in Ferrite/Cementite Lamellar Structure
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Crystal Plasticity Analysis Considering Dislocations’ Behavior in Ferrite/Cementite Lamellar Structure

机译：考虑位错在铁素体/渗碳体层状结构中的行为的晶体塑性分析

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摘要

Mechanical properties of ferrite/cementite lamellar structure model in pearlite steel with the Pitsch-Petch orientation relationship are examined by a strain gradient crystal plasticity analysis. Dislocations’ behavior in the lamellar structure is especially considered in the analysis and characteristic lengths of the structure used in its constitutive equations are approximately determined for each slip system. From the analysis results for different lamellar thicknesses, a scale effect on the yield stress of the pearlite model is smaller than that in case of uniform estimation of the characteristic length by the lamellar thickness because of a reduction of the Orowan stress. The yield stress shows better agreement with an experimental result. On the other hands, a scale effect on the strain hardening rate is larger than that of the uniformly estimation. This is attributed to obvious change of active slip systems in the ferrite layer associated with the thickness. It is found that while slip systems with the largest Schmid factor act in case of large thickness, slip systems which have small critical resolved shear stress act in case of small thickness due to the increase of slip anisotropy. And the change of active slip systems arises large shear incompatibility in each layer and makes the stress fields in the layer non-uniform for the model with Pitsch-Petch relationship.
机译：通过应变梯度晶体塑性分析，研究了具有Pitsch-Petch取向关系的珠光体钢中铁素体/渗碳体层状结构模型的力学性能。分析中特别考虑了层状结构中的位错行为，并针对每个滑移系统大致确定了结构本构方程中使用的结构特征长度。从不同的层状厚度的分析结果来看，由于降低了Orowan应力，对珠光体模型屈服应力的尺度效应要小于根据层状厚度均匀估计特征长度的尺度效应。屈服应力显示出与实验结果更好的一致性。另一方面，对应变硬化率的尺度效应大于均匀估计的尺度效应。这归因于与厚度相关的铁氧体层中的活动滑移系统的明显变化。已经发现，尽管具有最大施密特因子的滑移系统在较大厚度的情况下起作用，但是具有较小临界分辨剪切应力的滑移系统在较小厚度的情况下由于滑动各向异性的增加而起作用。主动滑移系统的变化会在每一层产生较大的剪切不相容性，并使具有Pitsch-Petch关系的模型的层中的应力场变得不均匀。

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