The Open UniversitySkip to content
 

Effect of delta phase on the hot deformation behaviour and microstructural evolution of Inconel 718

Lalvani, Himanshu; Rist, Martin and Brooks, Jeffery W. (2010). Effect of delta phase on the hot deformation behaviour and microstructural evolution of Inconel 718. Advanced Materials Research, 89-91 pp. 313–318.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.4028/www.scientific.net/AMR.89-91.313
Google Scholar: Look up in Google Scholar

Abstract

In order to investigate the influence of δ-phase precipitation during high temperature forging of Inconel 718, hot axi-symmetric compression tests have been performed on specimens with two distinct initial microstructures: i) as-received material containing a dense population of δ precipates at grain boundaries and along intragranular slip planes, and ii) material solution-treated to dissolve the δ phase. Results indicate that the presence of δ leads to a slight increase in peak stress and a proportionately greater post-peak reduction in flow stress, as compared to solution-treated material. For both types of microstructure flow softening is associated with grain refinement, but in different ways: in δ-free material conventional dynamic recrystallisation leads to the formation of new grains, whereas the presence of plate-like δ appears to cause the mechanical break-up and segmentation of prior grains.

Item Type: Journal Article
Copyright Holders: 2010 Trans Tech Publications Ltd
ISSN: 1022-6680
Keywords: Inconel 718; delta phase; hot deformation
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 19467
Depositing User: Martin Rist
Date Deposited: 26 Jan 2010 11:49
Last Modified: 13 Mar 2014 12:02
URI: http://oro.open.ac.uk/id/eprint/19467
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk