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An EBSD study of the deformation of service-aged 316 austenitic steel

Githinji, David N.; Northover, Shirley; Bouchard, P. John and Rist, Martin A. (2013). An EBSD study of the deformation of service-aged 316 austenitic steel. Metallurgical and Materials Transactions A, 44(9) pp. 4150–4167.

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URL: http://link.springer.com/article/10.1007%2Fs11661-...
DOI (Digital Object Identifier) Link: https://doi.org/10.1007/s11661-013-1787-7
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Abstract

Electron backscatter diffraction (EBSD) has been used to examine the plastic deformation of an ex-service 316 austenitic stainless steel at 297K and 823K (24 °C and 550 °C)at strain rates 3.5x10-3 to 4 x 10-7 s-1. The distribution of local misorientations was found to depend on the imposed plastic strain following a lognormal distribution at true strains < 0.1 and a gamma distribution at strains > 0.1. At 823 K (550 °C), the distribution of misorientations depended on the applied strain rate. The evolution of lattice misorientations with increasing plastic strain up to 0.23 was quantified using the metrics kernel average misorientation, average intragrain misorientation, and low angle misorientation fraction. For strain rate down to 10-5 s-1 all metrics were insensitive to deformation temperature, mode (tension vs. compression) and orientation of the measurement plane. The strain sensitivity of the different metrics was found to depend on the misorientation ranges considered in their calculation. A simple new metric, proportion of undeformed grains, is proposed for assessing strain in both aged and unaged material. Lattice misorientations build up with strain faster in aged steel than in un-aged material and most of the metrics were sensitive to the effects of thermal aging. Ignoring aging effects leads to significant overestimation of the strains around welds. The EBSD results were compared with nanohardness measurements and good agreement established between the two techniques of assessing plastic strain in aged 316 steel.

Item Type: Journal Item
Copyright Holders: 2013 The Minerals, Metals & Materials Society and ASM International
ISSN: 1543-1940
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetEDF Energy (partial funding)
Keywords: austenitic stainless steel; plastic deformation; electron backscatter diffraction; strain rate; misorientation distribution; hardness
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Item ID: 37565
Depositing User: Shirley Northover
Date Deposited: 30 May 2013 11:39
Last Modified: 30 Nov 2016 06:25
URI: http://oro.open.ac.uk/id/eprint/37565
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