冷速對IN718凝固過程中偏析和Rayleigh數的影響

王玲; 董建新; 李傳起

doi:10.13374/j.issn1001-053x.2007.12.024

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冷速對IN718凝固過程中偏析和Rayleigh數的影響

doi: 10.13374/j.issn1001-053x.2007.12.024

1. 北京科技大學材料科學與工程學院, 北京 100083;
2. 南京信息工程大學數理學院, 南京 210044

基金項目:

國家自然科學基金資助項目(No.50371006)

詳細信息

作者簡介:
王玲(1970-),女,講師,博士研究生;董建新(1965-),男,教授,博士生導師

中圖分類號: TG146.1⁺5
計量
- 文章訪問數: 142
- HTML全文瀏覽量: 19
- PDF下載量: 7
- 被引次數: 0
出版歷程
- 收稿日期: 2006-10-30
- 修回日期: 2006-12-25
- 網絡出版日期: 2021-08-16

Effect of cooling rate on the segregation and Rayleigh number of IN718 during solidification

1. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. College of Math and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China

摘要

摘要: 利用SEM和EDS研究了在冷速分別為1,3和6K·min^-1時高溫合金IN718的凝固組織、液體中Nb和Mo含量變化,并計算了液體密度差和相對Rayleigh數與溫度的關系.結果表明:由于偏析,液體中Nb、Mo含量和液體密度差隨著溫度的降低而增加;冷速越低,Nb、Mo偏析越嚴重,同溫度下液體密度差越大.相對Rayleigh數的計算表明,不同冷速下相對Rayleigh數都在1330℃存在最大值,隨著冷速降低,其值急劇增加,黑斑形成趨勢增大,大鑄錠中冷速低于1K·min^-1時會形成黑斑.
- IN 718 /
- 冷速 /
- 顯微偏析 /
- 密度差 /
- 相對Rayleigh數
Abstract: The solidification microstructure of superalloy IN718 and the contents of Nb and Mo in liquid during solidification were investigated at cooling rates of 1, 3 and 6 K·min^-1 by SEM and EDS. The liquid density difference and relative Rayleigh number at different temperatures and different cooling rates were calculated. The results show that the contents of Nb and Mo in liquid and the liquid density difference increase with decreasing temperature due to segregation. The slower the cooling is, the heavier the segregation of Nb and Mo is, and the more liquid density difference at the same temperature. The maximum values of relative Rayleigh number exist at 1 330℃ at all the three cooling rates, with the decrease in cooling rate the maximum values of relative Rayleigh number raise dramatically, and freckle tendency increases. Freckles could form in large industrial ingots at a cooling rate less than 1 K·min^-1
- Inconel 718 /
- cooling rate /
- microsegregation /
- density difference /
- relative Rayleigh number