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On the Origin of Mosaicity in Directionally Solidified Ni-Base Superalloys

34 Pages Posted: 27 May 2021 Publication Status: Accepted

See all articles by Joel Strickland

Joel Strickland

University of Leicester - School of Engineering

Bogdan Nenchev

University of Leicester - School of Engineering

Karl Tassenberg

University of Leicester - School of Engineering

Sam Perry

University of Leicester - School of Engineering

Gareth Sheppard

University of Leicester - School of Engineering

Hongbiao Dong

University of Leicester - School of Engineering

Ruiyao Zhang

Open University

Genoveva Burca

Rutherford Appleton Laboratory - ISIS Pulsed Neutron and Muon Source

Neil D'Souza

Rolls-Royce Plc

Abstract

Understanding the formation of secondary grains within single crystal alloys is of central importance to the aerospace industry, where components are directionally solidified in an axial thermal gradient. Post-mortem advanced microscopy characterisation techniques are employed to deduce the dendrite tip kinetics from transverse sections of a single crystal turbine blade orthogonal to the growth direction. As a result, it has been possible to highlight the role of isotherm curvature in inducing lateral macro-segregation parallel to a growing solidification front. Using crystallographic data from time-of-flight energy-resolved neutron imaging and novel Bragg-dip post processing, it is established that lateral macro-segregation induces mosaicity within single crystals, where fastest growing dendrites demonstrate greater deviation of <001> from the growth axis. Further, dendrites are found to grow in rows defined by the [100] and [010] crystallographic directions. In light of these findings, the origins of mosaicity are discussed.

Keywords: Directional solidification; Dendrite growth; Mosaicity; Time-of-flight energy-resolved neutron imaging; Crystal orientation

Suggested Citation

Strickland, Joel and Nenchev, Bogdan and Tassenberg, Karl and Perry, Sam and Sheppard, Gareth and Dong, Hongbiao and Zhang, Ruiyao and Burca, Genoveva and D'Souza, Neil, On the Origin of Mosaicity in Directionally Solidified Ni-Base Superalloys. Available at SSRN: https://ssrn.com/abstract=3854484 or http://dx.doi.org/10.2139/ssrn.3854484

Joel Strickland (Contact Author)

University of Leicester - School of Engineering

University Road
Leicester LE1 7RH, LE1 7RH
United Kingdom

Bogdan Nenchev

University of Leicester - School of Engineering

University Road
Leicester, LE1 7RH
United Kingdom

Karl Tassenberg

University of Leicester - School of Engineering

University Road
Leicester, LE1 7RH
United Kingdom

Sam Perry

University of Leicester - School of Engineering

University Road
Leicester LE1 7RH, LE1 7RH
United Kingdom

Gareth Sheppard

University of Leicester - School of Engineering

University Road
Leicester, LE1 7RH
United Kingdom

Hongbiao Dong

University of Leicester - School of Engineering

University Road
Leicester, LE1 7RH
United Kingdom

Ruiyao Zhang

Open University

Walton Hall
Milton Keynes, Buckinghamshire MK7 6AA
United Kingdom

Genoveva Burca

Rutherford Appleton Laboratory - ISIS Pulsed Neutron and Muon Source

Chilton, Didcot, Oxfordshire
England, OX11 OQX
United Kingdom

Neil D'Souza

Rolls-Royce Plc ( email )

Derby, DE24 8BJ
United Kingdom

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