In-situ SANS study on influence of boron addition on TaC precipitate stability in Co-Re alloys at high temperatures
Co-Re alloys are being developed to supplement Ni-base superalloys in future gas turbines for ultra-high temperature applications. Previous small-angle neutron scattering experiments at FRM II confirmed stability of fine (3-100 nm) Tantalum Carbides (TaC) up to 1200 °C. These precipitates are promising for strengthening the alloy at high temperatures. Addition of Boron increases strength and ductility in the alloy by making the grain boundaries more cohesive. However, it is known that B interacts with carbides in steels and Ni-alloys and hence might have an influence on stability of fine TaC. Neutron diffraction found an allotropic phase transformation in the Co-solid solution matrix in Co-Re alloys with varying C/Ta ratio at 1000 – 1300 °C, affecting stability of fine TaC. In a German Science Foundation (DFG) funded project jointly between TU Muenchen and TU-Braunschweig the main aim is to optimize the alloy composition with respect to the C/Ta ratio and boron content. In-situ SANS experiment at high temperatures is the method of choice to investigate the formation, evolution and stability of the fine TaC precipitates in alloys containing 0.1 to 0.4 at. % B.
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KARGE Lukas; GILLES Ralph; HONECKER Dirk; MUKHERJI Debashis and STRUNZ Pavel. (2016). In-situ SANS study on influence of boron addition on TaC precipitate stability in Co-Re alloys at high temperatures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-150
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