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材料研究学报  2010, Vol. 24 Issue (2): 118-122    
  研究论文 本期目录 | 过刊浏览 |
凝固速率对IN718合金定向凝固组织和偏析行为的影响
李嘉; 于连旭; 孙文儒; 张伟红; 刘芳; 祈峰; 郭守仁; 胡壮麒
中国科学院金属研究所
Effect of Solidification Rates on Microstructures and Segregation of IN718 Alloy
LI Jia; YU Lianxu; SUN Wenru;  ZHANG Weihong; LIU Fang; QI Feng; GUO Shouren; HU Zhuang
Institute of Metal Research; Chinese Academy of sciences; Shenyang 110016
引用本文:

李嘉 于连旭 孙文儒 张伟红 刘芳 祈峰 郭守仁 胡壮麒. 凝固速率对IN718合金定向凝固组织和偏析行为的影响[J]. 材料研究学报, 2010, 24(2): 118-122.
, , , , , , , . Effect of Solidification Rates on Microstructures and Segregation of IN718 Alloy[J]. Chin J Mater Res, 2010, 24(2): 118-122.

全文: PDF(717 KB)  
摘要: 

采用LMC高梯度定向凝固和微观分析方法, 研究了不同凝固速率下IN718合金的凝固组织和偏析行为。结果表明, 随着凝固速率的提高, 凝固界面由胞晶转为枝晶; 一次胞/枝晶间距在凝固速率为20 μm/s 时提高到最大值257 μm, 随后逐渐降低, 二次枝晶间距明显细化, 溶质分配比也随凝固速率的增加而减小。同时, 凝固速率增加使糊状区枝晶骨架的渗透性减小, 增大了对液体流动的阻碍作用。

关键词 金属材料  IN718 凝固速率   枝晶间距 微观偏析 渗透性    
Abstract

In this paper, the dendritic arm spacings and microsegregation of directionally solidified IN718 alloy at various solidification rates have been studied with a LMC directional solidification equipment. The results show that increasing the solidification rate, the primary dendrite arm spacings rise up to the maximum of 257 μm at 20 μm/s, then decrease, while the second dendritic arm spacings are refined continuously. Additionally, the microsegregation is suppressed and the permeability of mush zone decreases with solidification rate increasing.

Key wordsmetal materials    IN718    solidification rate    dendrite arm spacing    microsegregation    permeability
收稿日期: 2009-12-15     

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