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重熔溫度對Inconel 718定向凝固過程中糊狀區(qū)偏析和Rayleigh數(shù)的影響
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南京信息工程大學物理與光電工程學院,南京信息工程大學物理與光電工程學院,西北工業(yè)大學凝固國家重點實驗室,北京科技大學材料學院

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TG132.3 2

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Effects of Remelting Temperature on the Segregation and Rayleigh Numberin the Mushy Zone of Directionally Solidified Superalloy Inconel718
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School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,,School of Materials Science and Engineering,University of Science and Technology Beijing

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    摘要:

    用掃描電鏡（SEM）以及能譜分析方法（EDAX）研究了經(jīng)不同重熔溫度加熱并以一定速率定向凝固的高溫合金Inconel718糊狀區(qū)液相的顯微組織和成分。給出了液相中Nb、Mo沿著糊狀區(qū)的分布。同時計算了糊狀區(qū)液相密度差和相對Rayleigh數(shù)（Rar）。當重熔溫度從1600℃升高到1700℃，Mo偏析加重，糊狀區(qū)變長，液相密度差在凝固初期變大，糊狀區(qū)Rar的極大值顯著升高，這說明重熔溫度提高后熱溶質(zhì)對流趨勢增大，糊狀區(qū)變得不穩(wěn)定。

    Abstract:

    The microstructure and composition of the liquid along the mushy zone of superalloy Inconel 718 that was directionally solidified at various solidification rates after heated under different remelting temperature have been investigated by scanning electron microscope (SEM) and energy dispersion analysis spectrometry (EDAX) techniques.The content of Nb and Mo in the interdendritic liquid along the mushy zone was presented. The liquid-density difference and relative Rayleigh number in the interdendritic liquid were calculated. It was found that when the remelting temperature increased from 1600℃ to1700℃, the segregation of Mo became more serious, the liquid-density difference became higher at the beginning solidification and the maximum relative Rayleigh number (Rar) increased greatly which indicated the tendency of thermal solutal fluid flow became larger and mushy zoen was more unstable.

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王玲,許斌斌,劉林,董建新.重熔溫度對Inconel 718定向凝固過程中糊狀區(qū)偏析和Rayleigh數(shù)的影響[J].稀有金屬材料與工程,2017,46(2):565~570.[Wang Ling, Xu Binbin, Liu Lin, Dong Jianxin. Effects of Remelting Temperature on the Segregation and Rayleigh Numberin the Mushy Zone of Directionally Solidified Superalloy Inconel718[J]. Rare Metal Materials and Engineering,2017,46(2):565~570.]
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  • 收稿日期:2015-01-04
  • 最后修改日期:2016-01-27
  • 錄用日期:2016-02-24
  • 在線發(fā)布日期: 2017-04-10
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