Dendrite arm spacings and microsegregations in <001> and <011> orientated single crystal superalloys DD407

Chubin Yang, Lin Liu, Xinbao Zhao, Gang Liu, Jun Zhang, Hengzhi Fu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Single crystal superalloys DD407 with <001> and <011> orientations were produced with seeding technique by using the liquid metal cooling Bridgman furnace. The dendrite arm spacings (DAS) and microsegregations in the single crystal superalloys with <001> and <011> orientations were investigated. The results indicated that increasing the deviation angle from <001> orientation or decreasing the deviation angle from <011> would increase the dendrite arm spacing. In addition, DAS of single crystal grown along <011> orientation is obviously greater than that of <001> orientation for side-branching. EMPA results showed that the positive segregation elements Al, Ti and Ta enriched in the interdendritic region, and the negative segregation element W enriched in the dendrite core. The microsegregation in the single crystal with <011> orientation paralleled to the sample axis is the lightest. It is found that not only the DAS but the mechanism of dendrite evolution and arrayed pattern of dendrite affect the degree of microsegregation.

Original languageEnglish
Pages (from-to)1246-1250
Number of pages5
JournalJinshu Xuebao/Acta Metallurgica Sinica
Volume47
Issue number10
DOIs
StatePublished - Oct 2011

Keywords

  • Crystallographic orientation
  • Dendrite arm spacing
  • Directional solidification
  • Microsegregation
  • Ni-based single crystal superalloy

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