A comparable study on stray grain susceptibilities on different crystallographic planes in single crystal superalloys
A comparable study on stray grain susceptibilities on different crystallographic planes in single crystal superalloys
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单晶高温合金不同晶面杂散晶粒敏感性的比较研究
DOI：
10.1016/j.actamat.2020.116558
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发表时间：
2021-02-15
期刊：
影响因子：
9.4
通讯作者：
Wang, N.
中科院分区：
文献类型：
--
作者：
Guo, J. C.;Rong, P.;Wang, N.
激光重熔单晶高温合金时，基体取向会影响杂散晶粒的形成。通过改变激光在三个最常见的晶面（001）、（011）和（111）上的扫描方向，系统地研究了衬底取向对杂散晶粒磁化率的影响。我们发现，扫描方向对（011）和（111）面的杂散晶粒形成有显著影响，但对（001）面的影响较小。不同晶面的比较表明，（011）晶面的杂散增益敏感度最小，而（111）晶面的杂散增益敏感度最大。这可能是由于（011）面上的局部杂散晶粒的体积分数较低。研究结果表明，在（011）面沿着[100]方向进行激光修复可以最有效地抑制杂散晶粒的形成，为今后单晶器件激光修复中如何避免杂散晶粒的形成提供了深入的理论依据。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The substrate orientation can affect the stray grain formation in laser remelted single crystal superalloys. A systematic investigation on the effect of substrate orientation on stray grain susceptibility was performed by varying laser scanning directions on three most conventional crystallographic planes (001), (011), and (111). We found that the scanning direction has a drastic effect on stray grain formation in (011) and (111) planes but shows less impact in (001) plane. The comparison of different planes reveals that the stray gain susceptibility in (011) plane is the weakest whereas that in (111) plane is the strongest. This can be attributed to the lower volume fraction of the local stray grains on the (011) plane. Our results show that stray grain can be depressed most effectively if a laser repair is performed in (011) plane along [100] direction, which can provide an in-depth insight into the mechanism of how to avoid stray grain formation in the future laser repair of single crystal components. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.