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首页> 外文学位 >Evolution of microstructure of Haynes 230 and Inconel 617 under mechanical testing at high temperatures.
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Evolution of microstructure of Haynes 230 and Inconel 617 under mechanical testing at high temperatures.

机译：在高温下进行机械测试时，Haynes 230和Inconel 617的微观结构演变。

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摘要

Haynes 230 and Inconel 617 are austenitic nickel based superalloys, which are candidate structural materials for next generation high temperature nuclear reactors. High temperature deformation behavior of Haynes 230 and Inconel 617 have been investigated at the microstructural level in order to gain a better understanding of mechanical properties. Tensile tests were performed at strain rates ranging from 10-3-10-5 s -1 at room temperature, 600 °C, 800 °C and 950 °C. Subsequent microstructural analysis, including Scanning Electron Microscopy, Transmission Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and X-Ray Diffraction were used to relate the microstructural evolution at high temperatures to that of room temperature samples. Grain sizes and precipitate morphologies were used to determine high temperature behavior and fracture mechanics.;Serrated flow was observed at intermediate and high temperatures as a result of discontinuous slip and dynamic recrystallization. The amplitude of serration increased with a decrease in the strain rate and increase in the temperature. Dynamic strain ageing was responsible for serrations at intermediate temperatures by means of a locking and unlocking phenomenon between dislocations and solute atoms. Dynamic recrystallization nucleated by grain and twin bulging resulting in a refinement of grain size. Existing models found in the literature were discussed to explain both of these phenomena.
机译：Haynes 230和Inconel 617是奥氏体镍基高温合金，是下一代高温核反应堆的候选结构材料。为了更好地了解机械性能，已经在微观结构水平上研究了Haynes 230和Inconel 617的高温变形行为。在室温，600°C，800°C和950°C下以10-3-10-5 s -1的应变速率进行拉伸测试。随后的微观结构分析，包括扫描电子显微镜，透射电子显微镜，能量色散X射线光谱学和X射线衍射，被用于将高温下的微观结构演变与室温样品的演变联系起来。晶粒大小和析出物形貌被用来确定高温行为和断裂力学。由于不连续的滑动和动态再结晶，在中等和高温下观察到了锯齿状的流动。锯齿状的振幅随着应变率的降低和温度的升高而增加。动态应变时效是由于位错与溶质原子之间的锁定和解锁现象，导致了中间温度下的锯齿。动态再结晶被晶粒核化和双凸出导致晶粒尺寸的细化。讨论了文献中发现的现有模型以解释这两种现象。

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  • 作者

    Hrutkay, Kyle.;

  • 作者单位

    University of South Carolina.;

  • 授予单位 University of South Carolina.;
  • 学科 Engineering Nuclear.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2013
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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