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首页> 外文期刊>Materials Science and Engineering >Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718
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Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718

机译：Inconel 718热变形过程中的动态再结晶机理和孪晶演化

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摘要

The hot deformation behavior of an IN718 superalloy was studied by isothermal compression tests under the deformation temperature range of 950-1100 ℃ and strain rate range of 0.001-1 s~(-1) up to true strains of 0.05, 0.2, 0.4 and 0.7. Electron backscattered diffraction (EBSD) technique was employed to investigate systematically the effects of strain, strain rate and deformation temperature on the subgrain structures, local and cumulative misorientations and twinning phenomena. The results showed that the occurrence of dynamic recrystallization (DRX) is promoted by increasing strain and deformation temperature and decreasing strain rate. The microstructural changes showed that discontinuous dynamic recrystallization (DDRX), characterized by grain boundary bulging, is the dominant nucleation mechanism in the early stages of deformation in which DRX nucleation occurs by twining behind the bulged areas. Twin boundaries of nuclei lost their £3 character with further deformation. However, many simple and multiple twins can be also regenerated during the growth of grains. The results showed that continuous dynamic recrystallization (CDRX) is promoted at higher strains and large strain rates, and lower temperatures, indicating that under certain conditions both DDRX and CDRX can occur simultaneously during the hot deformation of IN718.
机译：通过等温压缩试验研究了变形温度范围为950-1100℃，应变速率范围为0.001-1 s〜（-1）直至真实应变为0.05、0.2、0.4和0.7的IN718高温合金的热变形行为。 。电子背散射衍射（EBSD）技术被用来系统地研究应变，应变速率和变形温度对亚晶粒结构，局部和累积取向错误以及孪晶现象的影响。结果表明，通过增加应变和变形温度以及降低应变速率来促进动态再结晶（DRX）的发生。显微组织变化表明，以晶界隆起为特征的不连续动态再结晶（DDRX）是变形早期的主要成核机制，在变形初期，DRX成核是通过在隆起区域的后面缠绕而发生的。原子核的双边界因进一步变形而失去了£3的特性。但是，许多简单和多生双胞胎也可以在谷物生长过程中再生。结果表明，在较高的应变和较大的应变速率以及较低的温度下，可促进连续动态重结晶（CDRX），这表明在某些条件下DDRX和CDRX可以在IN718热变形期间同时发生。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|137-152|共16页
  • 作者

    M. Azarbarmas; M. Aghaie-Khafri; J.M. Cabrera; J. Calvo;

  • 作者单位

    Faculty of Materials Science and Engineering, KM. Toosi University of Technology, 1999143344 Tehran, Iran;

    Faculty of Materials Science and Engineering, KM. Toosi University of Technology, 1999143344 Tehran, Iran;

    Departament de Ctencia dels Materials i Enginyeria Metallurgica, ETSEIB - Universitat Politkcnica de Catalunya, Av. Diagonal 647, 08028 Barcelona,Spain;

    Departament de Ctencia dels Materials i Enginyeria Metallurgica, ETSEIB - Universitat Politkcnica de Catalunya, Av. Diagonal 647, 08028 Barcelona,Spain;

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  • 正文语种 eng
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  • 关键词

    Inconel 718; Hot compression test; EBSD; Misorientation; Twinning;

    机译：因科镍合金718;热压测试;EBSD;方向错误;结对;

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