The effect of particles size on work hardening behavior of a low carbon steel with a composite-type microstructure
The effect of particles size on work hardening behavior of a low carbon steel with a composite-type microstructure
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DOI：
10.1016/j.msea.2017.06.093
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发表时间：
2017-08
期刊：
影响因子：
6.4
通讯作者：
M. S. Mohsenzadeh;M. Mazinani
中科院分区：
文献类型：
--
作者：
M. S. Mohsenzadeh;M. Mazinani
本文研究了颗粒尺寸对具有复合组织的低碳钢加工硬化的影响。基于颗粒半径、体积分数和基体晶粒尺寸等微观组织特征，建立了微力学模型来预测这些钢的各向同性和运动学对加工硬化的贡献。结果表明，在相同体积分数的颗粒中，细颗粒引起的各向同性加工硬化大于粗颗粒引起的各向同性加工硬化。另一方面，由于相对较低的塑性错配应变的松弛，粗颗粒对运动加工硬化的主要贡献。同时评价了双峰粒度分布对加工硬化的影响。虽然在含有粗颗粒的钢组织中加入一定量的细颗粒对增强各向同性对加工硬化的贡献有主要作用，但它们对均匀应变的影响很小。此外，各向同性和运动学对细颗粒的加工硬化行为的贡献在粗颗粒的存在下增加。
In this study, the influence of particles size on the work hardening of low carbon steels with composite-type microstructures has been studied. A micromechanical model has been developed to predict the isotropic and kinematic contributions to work hardening of these steels based on the microstructural features including the particles radius and volume fraction as well as the matrix grain size. It was found that for the same volume fraction of particles, the isotropic work hardening caused by fine particles is greater than that of coarse particles. On the other hand, coarse particles exhibit the main contribution to kinematic work hardening as a result of the relaxation of a relatively lower amount of plastic misfit strain. The effect of bimodal particle size distribution on the work hardening was also evaluated. Although the addition of a certain amount of fine particles to the steel microstructures containing coarse particles has a main role in the enhancement of isotropic contribution to work hardening, they have a slight influence on the uniform strain. In addition, the isotropic and kinematic contributions to work hardening behavior of fine particles increase in the presence of coarse particles.