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Matrix switch related to microstructural connectivity and its effect on strength in metals with duplex microstructure

机译：与微结构连通性有关的矩阵开关及其对具有双相微结构的金属的强度的影响

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摘要

To understand the microstructural factors dominantly affecting the mechanical properties of metals with duplex microstructures on a mesoscale, the change in the 0.2% proof stress as a function of the hard austenite fraction of an Fe-Ni austenitic alloy having a duplex microstructure composed of soft and hard austenite was investigated in terms of the microstructural connectivity. The 0.2% proof stress continuously increased with increasing fraction of the hard austenite. However, the strengthening behavior changed when the hard austenite fraction exceeded a critical value; the 0.2% proof stress shifted from the lower limit stress to the upper limit one calculated by secant method at the critical fraction. This demonstrates that the matrix of duplex microstructure was switched from soft austenite to hard austenite at the critical fraction. On the other hand, it was also confirmed that the non-monotonic strengthening behavior has a good correlation with the microstructural connectivity of the hard austenite, that is, the percolation phenomenon. From these result, it was concluded that the strength of metals with duplex microstructure can be wholly predicted based on secant method while taking into account the matrix switching between soft and hard phases, and the percolation index has a possibility to be a useful parameter to distinguish between soft and hard phases which is the matrix of the duplex microstructure, although further investigation is needed on a degree of the hard phase connection.
机译：为了了解在中尺度上主要影响具有双相微观结构的金属的机械性能的微观结构因素，0.2％屈服强度的变化是具有双相微观结构的Fe-Ni奥氏体合金的硬奥氏体分数的函数，该合金具有由软质合金和根据显微组织的连通性研究了硬奥氏体。 0.2％屈服强度随硬奥氏体含量的增加而连续增加。但是，当奥氏体硬质分数超过临界值时，强化行为发生变化。 0.2％屈服极限应力从下限应力向上限方向移动，正割应力通过割线法计算得出。这表明，双相组织的基体在关键部位从软奥氏体转变为硬奥氏体。另一方面，还证实了非单调强化行为与硬奥氏体的微观结构连通性即渗滤现象具有良好的相关性。从这些结果可以得出结论，考虑到软相和硬相之间的矩阵切换，可以基于割线法完全预测具有双相组织的金属的强度，并且渗滤指数有可能成为有用的参数来区分在软相和硬相之间是双相微结构的基质，尽管还需要进一步研究硬相连接的程度。

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  • 来源
    《Materials Science and Engineering》 |2017年第6期|270-276|共7页
  • 作者

    Nobuo Nakada; Shouhei Kawasaki; Yuuki Kogakura; Toshihiro Tsuchiyama; Setsuo Takaki;

  • 作者单位

    Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;

    Formerly Graduate Student of Engineering, Kyushu University, Japan;

    Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;

    Department of Materials Science and Engineering, Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan,International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;

    Department of Materials Science and Engineering, Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan,International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;

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  • 正文语种 eng
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  • 关键词

    Matrix switch; Connectivity; Percolation; Duplex microstructure; Yield strength; Strain partitioning; Secant method;

    机译：矩阵开关;连接性;渗滤;双相组织;屈服强度;应变分区正割法;

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