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首页> 外文期刊>International Journal of Plasticity >Static and dynamic mechanical behaviors of gradient-nanotwinned stainless steel with a composite structure: Experiments and modeling
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Static and dynamic mechanical behaviors of gradient-nanotwinned stainless steel with a composite structure: Experiments and modeling

机译：具有复合结构的梯度 - 纳米电器不锈钢的静态和动态力学行为：实验与造型

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摘要

The metals with gradient nanostructures possess exceptionally superior mechanical properties. Here, the gradient-nanotwinned 304 stainless steel wires are fabricated by surface mechanical attrition treatment (SMAT) with a range of process time. The quasi-static tensile tests and dynamic compressive tests are conducted to examine the constitutive response of gradient-nanotwinned 304 stainless steels under different loadings. The experimental measurements show that under static and dynamic loadings, their mechanical properties are closely related to the SMAT process time. With an increase in the process time, their yield strength is improved, while their ductility is weakened. Furthermore, a theoretical model is proposed to describe the static and dynamic constitutive relation of gradient nanotwinned 304 stainless steels. The micro mechanical model of nanotwinned composite is developed to characterize the constitutive relation of the material with nanograins embedded in nanotwinned matrix in depth. For the constitutive relations of each phase in nanotwinned composite structure, the athermal behaviors of dislocations are only considered in describing the flow stress under the static loadings. The size dependent athermal flow stress and rate-dependent thermal flow stress are both involved under the dynamic loadings. The theoretical simulations demonstrated that the mechanical response of gradient-nanotwinned 304 stainless steels under different loadings can be successfully characterized by the presented model. A good agreement is obtained between the numerical results and experimental measurements. Furthermore, the mechanical properties of gradient-nanotwinned 304 stainless steels are forecasted for the various distribution of twin spacing along the depth. The results in this work are helpful for optimizing the static and dynamic mechanical performance of the gradient-nanostructured metallic materials through controlling micro structural size and distribution.
机译：具有梯度纳米结构的金属具有异常优异的机械性能。这里，梯度 - 纳米型304不锈钢线通过表面机械磨损处理（SMAT）制造，具有一系列处理时间。进行准静态拉伸试验和动态压缩试验，以检查不同载荷下梯度 - 纳米型304不锈钢的组成响应。实验测量表明，在静态和动态载荷下，它们的机械性能与SMAT处理时间密切相关。随着过程时间的增加，它们的屈服强度得到改善，而它们的延展性被削弱。此外，提出了理论模型来描述梯度纳米型304不锈钢的静态和动态本构关系。开发了纳米丝的微型机械模型，以表征纳米疱疹嵌入纳米型基质中的材料的本构体关系。对于纳米型复合结构中的每个相的组成型关系，仅考虑脱位的动脉行为在描述静载荷下的流量应力。在动态载荷下，尺寸依赖的动脉流应力和速率相关的热流应力都涉及。理论模拟表明，通过所提出的模型可以成功地表征梯度 - 纳米型304不锈钢的机械响应。在数值结果和实验测量之间获得了良好的一致性。此外，预测沿深度的双间距的各种分布的梯度 - 纳米型304不锈钢的机械性能。该工作的结果有助于通过控制微结构尺寸和分布，优化梯度纳米结构金属材料的静态和动态力学性能。

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