Planar Front Growth of Single Crystal Ni-Based Superalloy René N515

Planar Front Growth of Single Crystal Ni-Based Superalloy René N515
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单晶镍基高温合金 René N515 的平面正面生长

DOI:
10.1007/s11837-020-04091-x
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发表时间:
2020
期刊:
JOM
影响因子:
2.6
通讯作者:
Titus, Michael S.
Titus, Michael S.
中科院分区:
材料科学3区
文献类型:
--
作者:
Matsunaga, Sae;Huang, Duo;Inman, Samuel B.;Mason, Jack C.;Konitzer, Doug;Johnson, David R.;Titus, Michael S.

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采用悬浮区熔法制备了一种镍基高温合金René N515,并进行了单晶生长。研究了区熔和固溶热处理后合金的显微组织、合金成分和显微硬度特性,并与定向凝固状态进行了比较,以研究显微偏析对这些合金特性的影响。在平面前沿区,枝晶组织和显微偏析消失,铸件气孔密度降低。通过数值求解区域熔化质量平衡方程,模拟了区域熔化/平面生长过程,测量和预测的平面前沿的成分分布符合得很好。维氏显微硬度在整个平面前区域没有变化。这些结果表明,第二代单一镍基高温合金可以通过悬浮区熔制备出几乎均匀的平面前缘,并且可以完全消除常见的铸造缺陷。
A Ni-based superalloy, René N515, was fabricated by the levitation zone melting process to produce planar front single crystal growth. Microstructure, alloy composition, and microhardness properties of the as-zone melted and solution heat treated alloy were investigated and compared with the directionally solidified state to study the effect of microsegregation on these alloy characteristics. In the planar front region, the dendritic structure and microsegregation were eliminated, and the density of casting porosity decreased as well. We modeled the zone melting/planar growth process by solving the zone melting mass balance equation numerically, and the measured and predicted composition profile of the planar front were in good agreement. The Vickers microhardness did not vary throughout the planar front region. These results indicate that a nearly homogeneous planar front of a 2nd-generation single Ni-based superalloy can be fabricated via levitation zone melting, and common casting defects can be eliminated entirely.
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