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Grain refinement effect of pulsed magnetic field on solidified microstructure of superalloy IN718

机译：脉冲磁场的晶粒细化对高温合金IN718凝固组织的影响

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摘要

The refinement mechanism of pulsed magnetic field (PMF) was discussed by experimental investigation, and the effects of exciting frequency, exciting voltage, and delay time of PMF on grains refinement of superalloy were studied. The experimental results show that, as exciting frequency or exciting voltage is increased, the grains are refined. However, the grains become coarse when frequency increases further. As delay time of PMF increases, the grain size increases. The refinement effect of PMF is attributed to the detachment of heterogeneous nuclei on the mold wall and subsequently separation of nuclei in the melt. The Joule heat can prolong the continuous nucleation process. However, the refinement effect will be impaired if the Joule heat is strong enough to remelt the detached nuclei.
机译：通过实验研究，探讨了脉冲磁场（PMF）的细化机理，并研究了励磁频率，励磁电压和延迟时间对高温合金晶粒细化的影响。实验结果表明，随着激发频率或激发电压的增加，晶粒细化。然而，当频率进一步增加时，晶粒变得粗糙。随着PMF延迟时间的增加，晶粒尺寸也会增加。 PMF的细化效果归因于模具壁上异质核的分离以及熔体中核的分离。焦耳热可延长连续成核过程。但是，如果焦耳热足够强到可以使分离出的原子核再熔化，则细化效果将受到损害。

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  • 来源
    《Journal of Materials Research》 |2009年第10期|3174-3181|共8页
  • 作者

    Xiaoping Ma; Yingju Li; Yuansheng Yang;

  • 作者单位

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

  • 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
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