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高Nb-TiAl合金在等温过程中相变动力学研究

李莹 田淑侠 樊江磊 王艳 刘建秀

李莹, 田淑侠, 樊江磊, 王艳, 刘建秀. 高Nb-TiAl合金在等温过程中相变动力学研究[J]. 钢铁钒钛, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009
引用本文: 李莹, 田淑侠, 樊江磊, 王艳, 刘建秀. 高Nb-TiAl合金在等温过程中相变动力学研究[J]. 钢铁钒钛, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009
Li Ying, Tian Shuxia, Fan Jianglei, Wang Yan, Liu Jianxiu. Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009
Citation: Li Ying, Tian Shuxia, Fan Jianglei, Wang Yan, Liu Jianxiu. Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009

高Nb-TiAl合金在等温过程中相变动力学研究

doi: 10.7513/j.issn.1004-7638.2022.05.009
基金项目: 河南省科技攻关项目(202102210451,202102210446)
详细信息
    作者简介:

    李莹,1985年出生,女,河南新乡人,博士,讲师,主要研究方向:金属材料,E-mail:youxinjiaodan@126.com

  • 中图分类号: TF823,TG146.2

Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments

  • 摘要: 采用原位热膨胀法较为系统地研究了高Nb-TiAl合金的等温相变动力学。结果表明:高Nb-TiAl合金α2→α等温相变过程中,其“鼻尖”温度为1170 ℃,此温度下α相的转变速度最快,且该相的形成呈“S”曲线。基于热膨胀曲线,获取了等温过程中相应的JMA等温相变动力学方程,基于JMA方程,通过对数拟合相转变分数-时间曲线,获取高Nb-TiAl合金等温相变动力学Avrami指数n和温度常数K,建立了高Nb-TiAl合金温度-时间-相转变的定量关系TTT曲线(Time-Temprature-Transformation);并揭示了合金扩散控制的相变动力学机制。
  • 图  1  DIL曲线在等温过程中随时间的变化曲线

    Figure  1.  Viriation of DIL curves with time during aging at different temperature

    图  2  高Nb-TiAl合金不同温度的等温过程中相变动力学曲线

    Figure  2.  Phase transformation kinetics cuvers of high Nb-TiAl alloys at different aging temperature

    图  3  高Nb-TiAl合金在不同温度下的$\ln(\ln({1 / {(1 - f)}})){{ - }}\ln{{t}}$关系

    Figure  3.  Plots of $ \ln(\ln(1/(1-f))) $ against $\ln t$ for the aging treatment at temperature for high Nb-TiAl alloy

    图  4  高Nb-TiAl合金计算等温相变动力学曲线

    Figure  4.  Calculated phase transformation kinetics of high Nb-TiAl alloy during aging treatment

    图  5  高Nb-TiAl合金的TTT曲线

    Figure  5.  The time-temperature-transformation (TTT) curves of high Nb-TiAl alloy

    表  1  高Nb-TiAl合金等温相变JMA方程中的Avrami方程中指数n值与k值

    Table  1.   The Avrami exponen n and k value of JMA parameters for high Nb-TiAl alloys during aging treatment

    T/℃nk
    11401.525.53×10−8
    11602.709.94×10−14
    11702.452.08×10−12
    11802.516.45×10−13
    12002.823.05×10−14
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-03-31
  • 刊出日期:  2022-11-01

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