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

Miao Huo, Lin Liu, Wenchao Yang, Yafeng Li, Songsong Hu, Haijun Su, Jun Zhang, Hengzhi Fu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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.

Original languageEnglish
Pages (from-to)251-260
Number of pages10
JournalJournal of Materials Research
Volume34
Issue number2
DOIs
StatePublished - 28 Jan 2019

Keywords

  • Low angle grain boundaries (LABs)
  • Ni-based superalloys
  • Sliver
  • Solidification conditions

Fingerprint

Dive into the research topics of 'Formation of low-angle grain boundaries under different solidification conditions in the rejoined platforms of Ni-based single crystal superalloys'. Together they form a unique fingerprint.

Cite this