Investigation of grain competitive growth during directional solidification of single-crystal nickel-based superalloys

Xinbao Zhao, Lin Liu, Jun Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Grain competitive growth of nickel-based single-crystal superalloys during directional solidification was investigated. A detailed characterization of bi-crystals’ competitive growth was performed to explore the competitive grain evolution. It was found that high withdrawal rate improved the efficiency of grain competitive growth. The overgrowth rate was increased when the misorientation increased. Four patterns of grain competitive growth with differently oriented dispositions were characterized. The results indicated that the positive branching of the dendrites played a significant role in the competitive growth process. The effect of crystal orientation and heat flow on the competitive growth can be attributed to the blocking mechanism between the adjacent grains.

Original languageEnglish
Pages (from-to)793-800
Number of pages8
JournalApplied Physics A: Materials Science and Processing
Volume120
Issue number2
DOIs
StatePublished - 25 Aug 2015

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