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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Dynamic Strain Aging on Tensile Deformation of 20MnMoNi55 Alloy
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Effect of Dynamic Strain Aging on Tensile Deformation of 20MnMoNi55 Alloy

机译：动态应变老化对20mNmoni55合金拉伸变形的影响

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摘要

Results obtained from the uniaxial tensile tests of 20MnMoNi55 low-alloy RPV steel at different temperatures (varying from 27 to 450 degrees C) and straining rates (varying from 10(-5) to 10(-1)s(-1)) reveal that the material response is sensitive to both temperature and strain rate. For the range of temperature varying from 200 to 400 degrees C, in combination with different strain rates, the material shows negative strain rate sensitivity along with different kinds of serrated flow (between 200 and 310 degrees C), commonly termed as Portevin-Le Chatelier effect (types A, B and C). The material behavior, in that temperature-strain rate window, is described by dynamic strain aging (DSA) effect, and the changes in the mechanical properties of the material are studied. The DSA attribute of 20MnMoNi55 steel is characterized by calculating the activation energy. The x-ray diffraction technique and atomic percentage analysis using energy-dispersive x-ray suggest that the manganese influences the interstitial (carbon and/or nitrogen) diffusion by forming Mn-C and/or Mn-N pair, which can be a plausible cause of DSA in the material.
机译：从不同温度（从27-450℃的不同温度（改变）的单轴拉伸试验获得的结果（改变27-450℃）和拉力速率（从10（-5）至10（-1））（-1））显示材料响应对温度和应变率敏感。对于从200至400摄氏度的温度范围不同，与不同的应变速率相结合，该材料显示出负应变速率灵敏度以及不同种类的锯齿状流（200至310℃），通常称为Portevin-Le Chatelier效果（类型A，B和C）。在该温度 - 应变速率窗口中，通过动态应变老化（DSA）效应来描述材料行为，研究了材料的机械性能的变化。通过计算激活能量，表征了20mnmoni55钢的DSA属性。使用能量分散X射线的X射线衍射技术和原子百分比分析表明，锰通过形成Mn-C和/或Mn-N对来影响间质（碳和/或氮）扩散，这可能是合理的物料中DSA的原因。

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