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arXiv · 2003.12609

Grain Boundary Serration in Nickel Alloy Inconel 600: Quantification and Mechanisms

Yuanbo T. Tang·Phani Karamched·Junliang Liu·Jack C. Haley·Roger C. Reed·Angus J. Wilkinson
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Abstract

The serration of grain boundaries in Inconel 600 caused by heat treatment is studied systematically. A new method based on Fourier transforms is used to analyse the multiple wave-like character of the serrated grain boundaries. A new metric -- the serration index -- is devised and utilised to quantify the degree of serration and more generally to distinguish objectively between serrated and non-serrated boundaries. By considering the variation of the serration index with processing parameters, a causal relationship between degree of serration and solution treatment/cooling rate is elucidated. Processing maps for the degree of serration are presented. Two distinct formation mechanisms arise which rely upon grain boundary interaction with carbides: (i) Zener-type dragging which hinders grain boundary migration and (ii) a faceted carbide growth-induced serration.

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Yuanbo T. Tang, Phani Karamched, Junliang Liu, Jack C. Haley, Roger C. Reed, Angus J. Wilkinson. 2020-03-27. Grain Boundary Serration in Nickel Alloy Inconel 600: Quantification and Mechanisms. https://doi.org/10.1016/j.actamat.2019.09.037

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