定向凝固过程中镍基高温合金双晶竞争生长分析  

Analysis on Macle Competitive Growth of Ni-base Super Alloy in Directional Solidification Process

作　　者：谢娜[1,2] 

机构地区：[1]陕西科技大学,陕西西安710021 [2]陕西能源职业技术学院,陕西咸阳712000

出　　处：《铸造技术》2014年第6期1267-1269,共3页Foundry Technology

摘　　要：通过调整双籽晶<001>的取向进而控制晶体取向,使之处于不同的平面位置,并让晶粒在低速抽拉下生长,研究了双晶镍基高温合金AM3胞状枝晶界面在定向凝固过程中双晶粒的相对位置及其影响,并进行定向凝固过程中镍基高温合金双晶竞争生长分析。结果表明:当两籽晶<001>取向的偏差角度几乎一样时,两晶粒竞争生长主要是通过胞状枝晶干的物理阻挡;当两籽晶<001>取向处于同一平面内时,伴随着凝固过程,在晶界处非常容易形成与原双籽晶<001>取向都不相同的晶粒。The orientation of the double seed crystal 〈001〉 orientation was adjusted to control the crystal orientation and make it in different surface position, at the same time make the grain growth in the low withdrawal rate. The position of the dendrite interface of double crystal Ni-base super alloy AM3 Cellular and its effects in the process of directional solidification were studied, and the double crystal competitive growth of Ni-base super alloy was analyzed. The results show that, when the deviation angle of the double seed 〈001〉 orientation is same, double grain competitive growth is mainly through the physical barrier of cellular dendrite. When the double seed 〈001〉 orientation is in the same plane, along with the solidification process, the grain which orientation is not same with the original double seed 〈001〉 orientation is easy formed.

关 键 词：定向凝固 镍基高温合金 竞争生长 

分 类 号：TG132.3[一般工业技术—材料科学与工程]