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Effects of strain rates and twins evolution on dynamic recrystallization mechanisms of austenite stainless steel

机译：应变率和双胞胎演化对奥氏体不锈钢动态再结晶机制的影响

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摘要

The isothermal compression (1050 degrees C) of a 304-type austenite stainless has been employed to understand the roles of strain rates (0.001, 0.01, 0.1, 1, and 10 s(-1)) and twinning in flow behaviors and microstructure evolution. Using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis, it was determined that the alloy underwent discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) in low and high strain rate regimes, respectively. In the low strain rate regime, twinning contributed to the separation of the bulged region for dynamic recrystallization (DRX) nucleation, and Sigma 3 twin boundaries mainly formed by 'growth accident' during the subsequent growth of nuclei. In the high strain rate regime, twinning did not require boundaries migration, and altered the orientation of boundary fronts, thus promoting the extension of the DRX area. Grain size exponents in low and high strain rate regimes were calculated to be -0.68 and -2.9, respectively. It was also confirmed that different DRX mechanisms result in distinct evolution of grain size, and the dividing point was determined to be the strain rate of 0.1 s(-1).
机译：已经采用304型奥氏体不锈钢的等温压缩（1050℃），以了解应变率（0.001,0.01,0.1,1和10 s（-1））和流动行为和微观结构演进的孪生作用。使用电子反向散射衍射（EBSD）和透射电子显微镜（TEM）分析，确定合金在低和高应变率制度中接受不连续的动态再结晶（DDRX）和连续的动态再结晶（CDRX）。在低应变率制度中，孪生有助于分离凸出区域进行动态再结晶（DRX）成核，并且在核随后的核生长期间主要由“生长事故”形成的Sigma 3对齐的双界限。在高应变率制度中，Twinning不需要边界迁移，并改变了边界前沿的方向，从而促进DRX区域的延伸。低应变率制度的晶粒大小指数分别计算为-0.68和-2.9。还证实了不同的DRX机制导致晶粒尺寸的不同发展，并且将分界点确定为0.1s（-1）的应变率。

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  • 来源
    《Materials Science and Engineering》 |2019年第jul22期|138044.1-138044.13|共13页
  • 作者

    Wang Xinyun; Wang Daokuan; Jin Junsong; Li Jianjun;

  • 作者单位

    Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Strain rate; Twin evolution; DRX mechanism; Grain refinement;

    机译：应变率;双胞胎进化;DRX机制;晶粒细化;

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