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Grain refinement effect of a pulsed magnetic field on as-cast superalloy K417

机译：脉冲磁场对铸态高温合金K417的晶粒细化效果

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摘要

The grain refinement effect of a pulsed magnetic field on superalloy K417 was studied. The experimental results show that fine equiaxed grains are acquired with proper thermal control under the pulsed magnetic field. The refinement effect of the pulsed magnetic field is affected by the melt cooling rate and the melt superheating. The refinement effect of the pulsed magnetic field is attributed to the dissociation of nuclei from the mold wall by melt vibration and the subsequent dispersion of nuclei by melt convection. The Joule heat and the melt convection caused by the pulsed magnetic field may defer the formation of solidified shell, which prolongs the continuous refinement process. The decrease of melt cooling rate reduces the number of nuclei produced on the mold wall but prolongs the duration for the nuclei to depart from the mold wall and disperse in the melt, which enhances the refinement effect of the pulsed magnetic field. The increase of melt superheating lessens the survival probability of the nuclei in the melt, which weakens the refinement effect of the pulsed magnetic field.
机译：研究了脉冲磁场对高温合金K417的晶粒细化作用。实验结果表明，在适当的温度控制下，在脉冲磁场下可以获得细等轴晶。脉冲磁场的细化效果受熔体冷却速率和熔体过热影响。脉冲磁场的细化效果归因于通过熔体振动使核从模具壁上解离，以及随后通过熔体对流使核分散。脉冲磁场引起的焦耳热和熔体对流可能会延迟凝固壳的形成，从而延长了连续精炼过程。熔体冷却速率的降低减少了在模具壁上产生的核的数量，但延长了核离开模具壁并分散在熔体中的持续时间，从而增强了脉冲磁场的细化效果。熔体过热的增加减小了熔体中原子核的存活概率，这削弱了脉冲磁场的细化效果。

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  • 来源
    《Journal of Materials Research》 |2009年第8期|2670-2676|共7页
  • 作者

    Xiaoping Ma; Yingju Li; Yuansheng Yang;

  • 作者单位

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People's Republic of 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);
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  • 正文语种 eng
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