Grain Boundary Serration in Nickel Alloy Inconel 600: Quantification and Mechanisms
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.
Keywords
Cite
@article{arxiv.2003.12609,
title = {Grain Boundary Serration in Nickel Alloy Inconel 600: Quantification and Mechanisms},
author = {Yuanbo T. Tang and Phani Karamched and Junliang Liu and Jack C. Haley and Roger C. Reed and Angus J. Wilkinson},
journal= {arXiv preprint arXiv:2003.12609},
year = {2020}
}