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Age Hardenable Nickel-Based Alloy Developments and Research for New High Temperature Power Cycles Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Constrained Lattice Misfit Measurement in Bulk Inconel 718 Using High Resolution Neutron Diffraction

Authors : R. Y. Zhang, Z. N. Bi, H. L. Qin, J. Zhang, A. D. Fortes, H. B. Dong

Published in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Publisher: Springer International Publishing

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Abstract

Lattice misfit is important in Inconel 718 (IN718) as coherency strain strengthening from γ″ precipitates is the principal source of strengthening in this alloy. The value of lattice misfit is defined by the difference in lattice parameter between each phase. In this study, high resolution time-of-flight (TOF) neutron diffraction has been used to measure the constrained lattice parameters and lattice misfits of a bulk IN718 sample. Thanks to the high resolution of the diffractometer, overlapped diffraction peaks are successfully deconvoluted, and the lattice parameters of different phases and lattice misfits are determined. The measured constrained lattice parameters of γ″ phase are much less than the reported unconstrained lattice parameters measured from extracted γ″ precipitates. The lattice misfit between γ″/γ phases along c-axis of γ″ phase is −0.015% indicating the γ″ precipitates are largely constrained and highly coherent with γ matrix in bulk IN718.

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previous chapter Compositional Design and Mechanical Properties of INCONEL® Alloy 725 Variants
next chapter Dependence of Creep Strength on Cooling Rate After Subsolvus Solution Treatment in Wrought Alloy 718
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Metadata
Title
Constrained Lattice Misfit Measurement in Bulk Inconel 718 Using High Resolution Neutron Diffraction
Authors
R. Y. Zhang
Z. N. Bi
H. L. Qin
J. Zhang
A. D. Fortes
H. B. Dong
Copyright Year
2018
Book
Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Print ISBN: 978-3-319-89479-9

Electronic ISBN: 978-3-319-89480-5

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-89480-5_27

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