Characterisation of secondary phases in Ni-base superalloy Rene 65. Issue 13 (2nd September 2018)

• Record Type: Journal Article
• Authors: Wojcik, Tomasz; Rath, Markus; Kozeschnik, Ernst
• Is Part Of: Materials science and technology. Volume 34:Issue 13(2018)
• Page Start: 1558
• Page End: 1564
• Publication Date: 2018-09-02
• Subjects: Rene 65 -- superalloys -- cast and wrought -- turbine discs -- gamma prime -- TEM; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2018.1505227
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: The Ni-base superalloy Rene 65 is a newly introduced cast and wrought alloy, used for turbine disc applications in aero-engines. The fine-grained and γ ′-strengthened alloy was developed to increase service temperatures up to over 700°C and therefore, enhance the efficiency of aerospace turbines. In this work, the phases occurring in the as-received material as well as after continuous cooling experiments are characterised by transmission electron microscopy (TEM). In the as-received material, a tri-modal γ ′ size distribution is found, ranging from a few nanometres up to approx. 5 µm. In addition, borides are found preferentially at grain boundaries with a size of approx. 1 µm. For different cooling rates, a change in morphology and size distribution of γ ′ precipitates is found. This is part of a thematic issue on Nanoscale Materials Characterisation and Modeling by Advances Microscopy Methods - EUROMAT.