High thermal gradient directional solidification and its application in the processing of nickel-based superalloys

Lin Liu, Taiwen Huang, Min Qu, Gang Liu, Jun Zhang, Hengzhi Fu

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

The heat transfer during directional solidification by Bridgman-type directional solidification has been analyzed and a relationship has been established that reflects the effect of alloy properties, process parameters and equipment characteristics on thermal gradients. Based on this relationship, some methods for obtaining high thermal gradients have been developed. By using zone-intensified overheating and liquid-metal cooling, high thermal gradients of up to 800 K/cm were achieved. Application of these methods in the processing of single crystal superalloys indicated that high thermal gradient directional solidification produced more uniform microstructures and optimized mechanical properties.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Materials Processing Technology
Volume210
Issue number1
DOIs
StatePublished - 1 Jan 2010

Keywords

  • Directional solidification
  • Superalloys
  • Thermal gradient

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