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Hot Deformation Behavior of Fe-2%Si

机译：Fe-2％Si的热变形行为

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摘要

The hot deformation behavior of a high purity binary ferritic Fe-2 mass% Si alloy, undergoing no phase transformation or precipitation reactions, was investigated by hot torsion tests. The parameters for the constitutive equation of Fe-2 mass% Si steel were experimentally determined from the stress-strain curves. The activation energy for hot deformation was close to that for lattice self-diffusion in α-Fe, indicating that hot deformation of Fe-2 mass% Si steel occurs by a thermally-activated, diffusion-controlled dislocation climb mechanism. The electron backscattering diffraction technique and transmission electron microscopy were used to analyze the microstructural changes occurring during hot deformation. It was found that the hot deformed microstructure consisted of equiaxed crystallites surrounded by a high proportion of high angle boundaries. These boundaries were homogeneously distributed in the microstructure. A gradual increase in the fraction of boundaries with a misorientation in the range of 10° to 18° was observed in samples obtained from interrupted torsion tests. The formation of high angle boundaries at temperatures above 0.5T_m is attributed to a gradual increase of the misorientation of low angle boundaries by the absorption of dislocations.
机译：通过热扭转试验研究了没有相变或析出反应的高纯度二元铁素体Fe-2质量％Si合金的热变形行为。根据应力-应变曲线，通过实验确定了Fe-2质量％Si钢的本构方程参数。在α-Fe中，热变形的活化能接近晶格自扩散的活化能，表明Fe-2质量％Si钢的热变形是通过热活化，扩散控制的位错爬升机制发生的。电子背散射衍射技术和透射电子显微镜被用来分析热变形过程中发生的微观结构变化。发现热变形的微观结构由被高比例高角度边界包围的等轴晶组成。这些边界均匀地分布在微观结构中。从中断的扭转试验中获得的样品中观察到边界分数的逐渐增加，且取向错误在10°至18°的范围内。在高于0.5T_m的温度下高角度边界的形成归因于由于位错的吸收而使低角度边界的取向错误逐渐增加。

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  • 来源
    《ISIJ international》 |2013年第2期|294-303|共10页
  • 作者

    Kyu Seok HAN; Tae Jin SONG; Bruno Charles De COOMAN;

  • 作者单位

    Electrical Steel Research Group, POSLAB, POSCO, Pohang, South Korea,Materials Design Laboratory, Graduate Institute of Ferrous Technology, POSTECH, Pohang, South Korea;

    Materials Design Laboratory, Graduate Institute of Ferrous Technology, POSTECH, Pohang, South Korea;

    Materials Design Laboratory, Graduate Institute of Ferrous Technology, POSTECH, Pohang, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hot deformation; constitutive equation; dislocation climb; continuous dynamic recrystallization;

    机译：热变形本构方程脱位爬升连续动态重结晶;

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