Statistics on the Primary Dendrite Spacing of Ni-based Single Crystal Super Alloys

Liu Guiqun; Feng Li; Wang Heming; Ma Feiya; Zhang Xiaoli; Yang Yanhong

doi:10.15980/j.tzzz.2021.02.005

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Statistics on the Primary Dendrite Spacing of Ni-based Single Crystal Super Alloys
Vol. 41, Issue 2, Pages: 153-157(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.02.005

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[1]刘贵群,冯丽,王贺明,马飞亚,张小丽,杨彦红.镍基单晶高温合金一次枝晶间距的统计研究[J].特种铸造及有色合金,2021,41(02):153-157.

Liu Guiqun, Feng Li, Wang Heming, et al. Statistics on the Primary Dendrite Spacing of Ni-based Single Crystal Super Alloys. [J]. Special Casting & Nonferrous Alloys 41(2):153-157(2021)
[1]刘贵群,冯丽,王贺明,马飞亚,张小丽,杨彦红.镍基单晶高温合金一次枝晶间距的统计研究[J].特种铸造及有色合金,2021,41(02):153-157. DOI： 10.15980/j.tzzz.2021.02.005.

Liu Guiqun, Feng Li, Wang Heming, et al. Statistics on the Primary Dendrite Spacing of Ni-based Single Crystal Super Alloys. [J]. Special Casting & Nonferrous Alloys 41(2):153-157(2021) DOI： 10.15980/j.tzzz.2021.02.005.

摘要

采用籽晶法制备了3种[001]取向的镍基单晶高温合金。通过正方形估算法和直接测量法统计了合金不同凝固高度的一次枝晶间距。该方案消除了晶界和晶体学取向对一次枝晶间距的影响。随着凝固高度升高

3种合金的一次枝晶平均间距逐渐增大。两种统计方法的一次枝晶平均间距相近

说明两种方法的精度均较高。此外

3种合金的一次枝晶间距在较大的范围内变化

且呈正态分布。3种合金的一次枝晶间距上限是下限的5.4～8.5倍。

Abstract

Three generation single crystal superalloys（SRR99

DD32 and DD90）were designed by the combination of directional solidification technology and seeding method.The primary dendrite spacings were calculated by the direct measurement method and the square calculation method.The effects of grain boundary and crystallographic orientation on the primary dendrite spacing were eliminated.The average primary dendrite spacings of three superalloys are increased gradually with the increase of solidification heights

and the ones counted by two methods are similar

confirming the accuracy of the two methods.Moreover

the primary dendrite spacings of the superalloys is varied in a large range and present a normal distribution.The upper limit of the primary dendrite spacing is 5.4～8.5 times higher than the lower limit.