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首页> 外文期刊>International Journal of Plasticity >Tensile prestrain memory effect on subsequent cyclic behavior of FCC metallic materials presenting different dislocations slip modes
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Tensile prestrain memory effect on subsequent cyclic behavior of FCC metallic materials presenting different dislocations slip modes

机译：拉伸预应变记忆对FCC金属材料随后循环行为的不同错位滑动模式

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摘要

The forming process of metallic products generally implies steps of large plastic deformation. Understanding the "memory" of this prestrain history on subsequent fatigue properties is therefore an important industrial requirement as well as a challenging objective. Following this purpose, the cyclic behavior of Face Centered Cubic (FCC) metals was investigated after different tensile prestrains and compared with the cyclic stress strain responses of the virgin samples. In the past, dislocations slip character was clearly highlighted as a significant factor influencing prestrain memory and the different materials sensibilities to this phenomenon were discussed on the basis of their stacking fault energies. Nonetheless, the domain of memory occurrence and its evolution as a function of cross slip ease remain unclearly defined. This paper will provide some clues in this matter by drawing cartographies of memory effect in the case of pure copper (easy cross slip), nickel-chromium alloy (planar slip) and 316L stainless steel (mixed behavior) subjected to axial loading at room temperature. From these cartographies, the existence of threshold of prestrain necessary to induce memory and threshold of plastic strain amplitude capable to erase memory will be discussed. (C) 2015 Elsevier Ltd. All rights reserved.
机译：金属产品的成型过程通常意味着较大的塑性变形步骤。因此，了解此预应变历史对后续疲劳特性的“记忆”是一项重要的工业要求，同时也是一个具有挑战性的目标。遵循此目的，研究了面心立方（FCC）金属在不同拉伸预应变后的循环行为，并将其与原始样品的循环应力应变响应进行了比较。过去，位错滑移特征被清楚地强调为影响预应变记忆的重要因素，并根据它们的堆垛层错能量讨论了不同材料对该现象的敏感性。尽管如此，记忆发生的域及其作为交叉滑动缓解的函数的演变仍不清楚。本文将通过绘制制图的图表来提供有关此问题的一些线索，这些图表在室温下承受纯轴向载荷的纯铜（易交叉滑动），镍铬合金（平面滑动）和316L不锈钢（混合性能）的情况下。从这些制图中，将讨论诱发记忆所需的预应变阈值和能够消除记忆的塑性应变幅度阈值的存在。 （C）2015 Elsevier Ltd.保留所有权利。

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