Application of in situ neutron and X-ray measurements at high temperatures in the development of Co-Re-based alloys for gas turbines

Debashis Mukherji, Joachim Rösler, Juri Wehrs, Pavel Strunz, Přemysl Beran, Ralph Gilles, Michael Hofmann, Markus Hoelzel, Helmut Eckerlebe, Laszlo Szentmiklósi, Zsuzsanna MácSik

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Co-Re alloy development is prompted by the search for new materials for future gas turbines which can be used at temperatures considerably higher than the current day single crystal Ni-based superalloys. The Co-Re-based alloys have been designed to have very high melting range, and they are meant for application at +373 K (+100 C) above Ni-superalloys. They are significantly different from the conventional Co-based alloys that are used in static components of today's gas turbines, and the Co-Re alloys have never been used for structural applications before. The Co-Re-Cr system has complex microstructure with many different phases present. Phase transformations and stabilities of fine strengthening precipitates at high temperatures remain mostly unexplored in the Co-Re alloys, and to develop basic understanding, model ternary and quaternary compositions were studied within the alloy development program. In situ neutron and synchrotron measurements at high temperatures were extensively used for this purpose, and some recent results from the in situ measurements are presented. In particular, the effect of boron doping in Co-Re alloys and the stabilities of the fine TaC precipitates at high temperatures were investigated. A fine dispersion of TaC precipitates strengthens some Co-Re alloys, and their stabilities at the application temperatures are critical. In the beginning, the alloy development strategy is very briefly discussed.

Original languageEnglish
Pages (from-to)22-30
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 1 2013

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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