Influence of withdrawal rate on the microstructure of Ni-base single-crystal superalloys containing Re and Ru

Gang Liu, Lin Liu, Cheng Ai, Bingming Ge, Jun Zhang, Hengzhi Fu

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

The influence of elevated withdrawal rate on the microstructure and segregation behavior of Ni-base single-crystal superalloys containing Re and Ru is investigated. The experimental superalloys are processed under a high thermal gradient of approximately 250 K/cm and withdrawal rates between 10 and 500 μm/s. With increasing withdrawal rate, the dendritic structures and γ′ precipitates in as-cast microstructures are apparently refined. Electron-probe microanalyzer (EPMA) results indicate that the degree of segregation for the constituent elements (e.g. Al, Ta, W, Re etc.) increases initially and then decreases with increasing withdrawal rate. In addition, the Re and Ru additions obviously increase the amounts of γ-γ′ eutectic and the tendency of segregation for Al and Ta.

Original languageEnglish
Pages (from-to)5866-5872
Number of pages7
JournalJournal of Alloys and Compounds
Volume509
Issue number19
DOIs
StatePublished - 12 May 2011

Keywords

  • Crystal growth
  • High-temperature alloys
  • Microstructure
  • Scanning electron microscopy

Fingerprint

Dive into the research topics of 'Influence of withdrawal rate on the microstructure of Ni-base single-crystal superalloys containing Re and Ru'. Together they form a unique fingerprint.

Cite this