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首页> 外文期刊>Revue de Metallurgie >Developpement de la texture de recristallisation par maclage multiple dans l'INVAR (Fe-36%Ni)
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Developpement de la texture de recristallisation par maclage multiple dans l'INVAR (Fe-36%Ni)

机译：在INVAR（Fe-36％Ni）中形成多孪晶重结晶织构

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摘要

The Fe-36%Ni austenitic alloy, so-called INVAR, is used to make shadow-masks in colour TV and computer monitor screens or in electronic devices because of its low thermal expansion coefficient and its magnetic properties. This alloy develops during cold rolling a copper-type texture and after subsequent annealing, a cube texture which is favourable to a regular piercing of apertures by chemical etching in Invar sheets for shadow-masks. The sharpness of the recrystallization texture depends on different parameters such as the deformation amount or the initial grain size. For intermediate deformations (reduction amounts less than about 70%), the recrystallization texture is very weak and it corresponds to the retained rolling texture associated to a weak cube component. In contrast, for higher deformations the cube texture is sharp. Several recrystallization mechanisms have been proposed in the literature to explain the cube texture formation. From the different proposed hypotheses, one can schematically describe the mechanisms as a function of the cell critical size which exists inside cube bands. If the critical size is not attained, the cube cells coalesce or grow in the orientation gradient observed in the cube bands. On the other hand, if the critical size is attained, the cube cells can grow inside the cube bands but also directly in the matrix; the deformation stored energy difference supplying the necessary driving pressure for the sub-boundary migration. This mechanism is experimentally illustrated by the boundary bulging into the matrix and is reported in the literature as strain induced boundary migration. At low deformation amounts for which the cube recrystallization texture is very smooth, the cube bands are thicker than previously and the orientation gradient weaker (smaller than 15°). A potential cube nucleus located at the center of a cube band can grow inside the band. However its growth rate remains slow because of the low orientation gradient and the small difference of stored energy between this nucleus and the matrix when the successful cube nucleus reaches a prior angle grain boundary or is at a prior grain boundary. Consequently, other orientations have time to develop and can increase the isotropic part of the recrystallization texture. Moreover, as it was experimentally observed, the twinning seems to play an important role. Indeed, for the 95% reduction, because of the quick development of the cube component, only the cube twin is observed after complete recrystallization. But, for the 70% reduction, since all the components can develop, they can also twin. Then, the texture can become isotropic from the twinning mechanism. The main objective of this paper consists to verify the experimental observations, so the development of the texture isotropic part by twinning. For that a simple twinning simulation procedure is used and the obtained results are compared to the experimental results obtained by neutron diffraction and EBSD. The results allow verifying that the texture isotropic part is obviously increased by multiple twinning. Then, the simulation permits to verify the twin generation number. So, it shows that three twin generations develop after complete recrystallization as experimentally observed.
机译：Fe-36％Ni奥氏体合金，称为INVAR，由于其低的热膨胀系数和磁性而被用于制造彩色电视机和计算机显示器屏幕或电子设备中的荫罩。这种合金在冷轧过程中会形成铜质织构，并在随后的退火过程中形成立方织构，这有利于通过荫罩的殷钢片中的化学刻蚀规则地打孔。再结晶织构的清晰度取决于不同的参数，例如变形量或初始晶粒尺寸。对于中间变形（减少量小于约70％），重结晶织构非常弱，并且它对应于与弱立方体成分关联的保留的滚动织构。相反，对于较大的变形，立方体纹理很锐利。文献中已经提出了几种重结晶机制来解释立方织构的形成。从提出的不同假设中，可以根据存在于立方带中的细胞临界大小来示意性地描述这种机制。如果未达到临界尺寸，则立方体单元会在立方体带中观察到的方向梯度中聚结或生长。另一方面，如果达到临界大小，则立方体单元可以在立方体带内生长，但也可以直接在基质中生长。变形存储的能量差为次边界迁移提供了必要的驱动压力。通过边界向基体中隆起进行实验说明了这种机理，并在文献中将其报告为应变诱导的边界迁移。在较低的变形量下，立方体的再结晶织构非常平滑，立方体带比以前厚，取向梯度更弱（小于15°）。位于立方体带中心的潜在立方体核可以在带内生长。但是，当成功的立方核到达先前的角晶界或位于先前的晶界时，由于取向梯度低且该核与基体之间的存储能量差异较小，其生长速度仍然很慢。因此，其他取向还有时间发展，并且可以增加再结晶织构的各向同性部分。而且，如通过实验观察到的，孪晶似乎起重要作用。确实，对于95％的还原，由于立方晶组分的快速发展，在完全重结晶后仅观察到立方晶孪晶。但是，由于减少了70％，因为所有组件都可以开发，所以它们也可以孪生。然后，纹理可以从孪生机制变为各向同性。本文的主要目的是验证实验观察结果，从而通过孪生发展各向同性的织构零件。为此，使用了简单的孪生模拟程序，并将获得的结果与通过中子衍射和EBSD获得的实验结果进行了比较。结果允许验证通过多次孪生明显增加了织构各向同性部分。然后，该模拟允许验证双胞胎代数。因此，它表明，如实验观察到的，在完全重结晶后会形成三个孪生代。

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  • 来源
    《Revue de Metallurgie》 |2003年第2期|p.193-202|共10页
  • 作者

    T. Baudin; F. Julliard; R. Penelle;

  • 作者单位

    Laboratoire de Physico-chimie de l'Etat Solide -UMR CNRS 8648, Universite de Paris-Sud, Orsay;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 fre
  • 中图分类 冶金工业;
  • 关键词

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