In-situ neutron diffraction during stress relaxation of a single crystal nickel-base superalloy

SCRIPTA MATERIALIA

卷:131

Article

Collins, David M.¹  D'Souza, Neil²  Panwisawas, Chinnapat³ 

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Rolls Royce Plc, POB 31, Derby DE24 8BJ, England

[3] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

关键词: Superalloys;    Neutron diffraction;    Single crystal;    Stress relaxation;    Lattice strain;   

DOI  :  10.1016/j.scriptamat.2017.01.002

来源: Elsevier

【 摘 要 】

The stress relaxation behaviour of a single crystal nickel-base superalloy has been quantified using time-of flight neutron diffraction analysis for a range of temperatures relevant to casting. A new iterative analysis methodology is described to isolate the lattice strain behaviour of the gamma matrix and gamma' precipitate phases from data obtained sufficiently rapidly to help elucidate the microscopic effect of macroscopic stress relaxation. The independent response of gamma and gamma' is revealed, showing the temperature sensitivity of lattice strain relaxation. The gamma/gamma' response is discussed in the context of thermo-mechanical conditions that may affect the propensity for recrystallisation. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

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