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首页> 外文期刊>Materials Science and Engineering >The effect of isothermal aging on microstructure and mechanical behavior of modified 2.5Al alumina-forming austenitic steel
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The effect of isothermal aging on microstructure and mechanical behavior of modified 2.5Al alumina-forming austenitic steel

机译：等温时效对改性2.5Al氧化铝形成奥氏体钢组织和力学性能的影响

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摘要

Microstructural evolution of modified 2.5Al alumina-forming austenitic steel after isothermal aging at 973 K was investigated by scanning electron microscope (SEM), and X-ray diffraction (XRD). Tensile and vicker's hardness tests were also carried out to study mechanical properties during isothermal aging. The average particle diameter of precipitates was statistically measured and the kinetic model was employed to describe the coarsening of precipitates. The results show that the precipitation sequence of Laves and NiAl phases was related to aging time, and precipitated after 20 h and 100 h in this work, respectively. The average particle diameter of precipitates continuously increased with aging time. And the coarsening rate of the precipitates decreased at 1000 h due to the exhaustion of Nb atoms in matrix. The precipitation of NiAl and Laves phases plays an important role in mechanical properties. The hardness and the work hardening rate continuously increased. In contrast, the elongation gradually decreased. The above results indicated that the effect of aging strengthening. The room temperature yield strength firstly sluggish increased and then gradually decreased, finally increased significantly due to the increase in sigma(gb), the decrease in sigma(dis) and sigma(ss), and the change in sigma(ppt).
机译：通过扫描电子显微镜（SEM）和X射线衍射（XRD）研究了改性的2.5Al形成氧化铝的奥氏体钢在973 K等温时效后的组织演变。还进行了拉伸和维氏硬度测试，以研究等温老化过程中的机械性能。统计测量沉淀物的平均粒径，并使用动力学模型描述沉淀物的粗化。结果表明，Laves相和NiAl相的析出顺序与时效时间有关，分别在20 h和100 h后析出。沉淀物的平均粒径随老化时间而连续增加。并且由于基体中Nb原子的耗尽，在1000h时析出物的粗化速率降低。 NiAl和Laves相的沉淀在机械性能中起重要作用。硬度和加工硬化率不断提高。相反，伸长率逐渐降低。以上结果表明了时效强化的作用。室温屈服强度先缓慢上升，然后逐渐下降，最后由于σ（gb）的增加，σ（dis）和σ（ss）的减小以及σ（ppt）的变化而显着增加。

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  • 来源
    《Materials Science and Engineering》 |2019年第4期|161-172|共12页
  • 作者

    Jiang Yujiao; Gao Qiuzhi; Zhang Hailian; Zhang Xin; Li Huijun; Liu Ziyun; Liu Chenxi;

  • 作者单位

    Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China|Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China;

    Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China|Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China;

    Daotian High Technol Co Ltd, Qinhuangdao 066004, Peoples R China;

    Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China|Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China;

    Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300354, Peoples R China;

    Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China|Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China;

    Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300354, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    AFA steel; Isothermal aging; Microstructure; Mechanical properties;

    机译：AFA钢;等温时效;显微组织;力学性能;

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