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Microstructure and property evolution of Fe-N ferrite undergoing early- stages of precipitation

机译：Fe-N铁氧体析出初期的组织和性能演变

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摘要

The precipitation-hardening phenomenon is well-known in nitrogen-supersaturated ferrite and its precipitation sequence has received extensive attention. Thus far the α"-Fe_(16)N_2 phase has been known as the main hardening precipitates in the alloy upon ageing at low temperatures. Here we report that distinct precursors (pre-a*) of the α"-phase exist and they also play a crucial role in the precipitation-hardened alloy. Using (in-situ) high-resolution transmission electron microscopy, property characterization and first-principle energy calculations in association with varying thermal processes, it is shown that lying on the {001 }a planes, the pre-a" precipitates have a plate-like morphology and are the major hardening precipitates in natural aged Fe-N ferrite. They are stable without much change even after tempering at 60 ℃ for 2 h. Furthermore, the plate-like pre-a" precipitates typically consist of needle-like domains, due to energy minimization. The in-situ observations demonstrate that the precipitation sequence upon ageing is as follows: N-supersaturated α-Fe→N-rich clusters→pre-α" (GP zones) →α", where GP zones stands for Guinier-Prestone zones. The pre-a" precipitates can have even more significant effects on properties of the alloy, as compared with the well-known a" precipitates.
机译：沉淀硬化现象在氮过饱和铁氧体中是众所周知的，其沉淀顺序已引起广泛关注。迄今为止，人们已经知道，α“ -Fe_（16）N_2相是低温时效时合金中的主要硬化沉淀。在这里，我们报道存在不同的α”-相前驱体（pre-a *）。在沉淀硬化合金中也起着至关重要的作用。使用（原位）高分辨率透射电子显微镜，特性表征和与变化的热过程相关的第一原理能量计算，结果表明，位于{001} a平面上的pre-a“沉淀物具有板状状形态，是天然时效Fe-N铁素体中的主要硬化沉淀。即使在60℃回火2 h后，它们也保持稳定，没有太大变化。此外，板状pre-a“沉淀通常由针状组成域，由于能量最小化。原位观察表明，时效过程中的沉淀顺序如下：N-过饱和α-Fe→N富集簇→pre-α”（GP区域）→α”，其中GP区域代表Guinier-Prestone区域。与众所周知的“ a”沉淀物相比，“ a”前沉淀物对合金性能的影响甚至更大。

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  • 来源
    《Materials Science and Engineering》 |2017年第1期|198-207|共10页
  • 作者

    Y. Hong; C.L. Wu; L. Tian; N. Li; Q. Xu; J.H. Chen;

  • 作者单位

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

    Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan Uniyersity, Changsha, Hunan 410082, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fe-N alloys; GP zone; α" phase; Precipitation; Transmission electron microscopy; Property;

    机译：Fe-N合金;GP区;α“相;沉淀;透射电镜;性能;

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