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Formation of low-angle grain boundaries under different solidification conditions in the rejoined platforms of Ni-based single crystal superalloys

Published online by Cambridge University Press:  09 November 2018

Miao Huo Open the ORCID record for Miao Huo [Opens in a new window] ,
Lin Liu ,
Wenchao Yang Open the ORCID record for Wenchao Yang [Opens in a new window] ,
Yafeng Li ,
Songsong Hu ,
Haijun Su ,
Jun Zhang  and
Hengzhi Fu
Miao Huo
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Lin Liu*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Wenchao Yang*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Yafeng Li*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Songsong Hu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Haijun Su
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Jun Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Hengzhi Fu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
*
a)Address all correspondence to these authors. e-mail: linliu@nwpu.edu.cn
b)e-mail: wenchaoyang@nwpu.edu.cn
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Abstract

The formation of low-angle grain boundaries (LABs) in the rejoined platforms of a Ni-based single crystal superalloy under different directional solidification rates was investigated by the experimental investigation and the ProCAST simulation. The results showed that the growth morphology and orientation evolution of dendrites in the platforms were different under the withdrawal rates in the range of 60–100 μm/s and then resulted in different types of LABs. At lower withdrawal rates, the longitudinal LABs were common in the rejoined platforms. Both the sliver defects and the orientation deviation of original primary dendrites from two independent growth paths could cause the longitudinal LABs in the platforms. At higher withdrawal rates, the dendrite growth patterns were more complex and the secondary branches with lateral growth tended to deviate from their original orientation, eventually leading to the formation of some transverse LABs. Finally, some suggestions to prevent the formation of different LABs are provided.

Keywords

Ni-based superalloyslow angle grain boundaries (LABs)sliversolidification conditions
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 2 , 28 January 2019 , pp. 251 - 260
Copyright
Copyright © Materials Research Society 2018 

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