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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Grain structure development in directional solidification of nickel-base superalloys
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Grain structure development in directional solidification of nickel-base superalloys

机译：镍基高温合金定向凝固的晶粒结构发展

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摘要

The micro structures of three single crystal superalloys (CMSX4, CM186LC and CMSX10) that exhibit quite different casting properties have been characterised quantitatively following quenched directional solidification to identify variations in the grain selection mechanisms. No significant differences in the dendrite morphologies of the alloys were observed. Detailed observation of dendrites in directionally solidified bicrystals of CMSX4 with well-controlled misorientations showed significant modification of the growth of secondary dendrites at the developing seeded grain boundary. The generally accepted criterion of overgrowth by secondary dendrites cannot account for the present results. It is proposed that the diffuse textures that are frequently produced in second and third generation superalloys are a consequence of the inhibition of secondary dendrite development due to competing solute diffusion fields.
机译：具有三种完全不同的铸造性能的三种单晶高温合金（CMSX4，CM186LC和CMSX10）的微观结构已通过定向凝固淬火后进行了定量表征，以识别晶粒选择机制的变化。没有观察到合金的枝晶形态的显着差异。定向凝固的CMSX4定向凝固双晶中树枝状晶体的详细观察表明，在发育的晶界处，次级树枝状晶体的生长发生了显着变化。次生树突过度生长的普遍接受的标准不能解释目前的结果。有人提出，在第二代和第三代高温合金中经常产生的扩散织构是由于竞争性溶质扩散场而抑制二次枝晶发展的结果。

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