On the lower limit of misorientation of grain boundaries in hot forging of AA7050
File(s)
OA Location
Author(s)
Gu, Bin
Jiang, Shuai
Shi, Zhusheng
Lin, Jianguo
Type
Conference Paper
Abstract
The goal of this work is to find a reasonable norm to measure the area of low angle grain boundaries (LABs) using EBSD data, which is useful for the metal forming community involved in developing appropriate constitutive models for dynamic recovery. Typically, LABs are defined as the grain boundaries with misorientation between 2° and 10°. However, it is found in this study that reasonable variations of area per volume of LABs (Slab) with strain level (ε), strain rate (έ) and temperature is not be observed for AA7050 with this definition. There is a competition among different processes, including sub-grain formation and coarsening, rotation of sub-grain/cell boundary and migration of LABs and high angle grain boundaries (HABs) during recovery and continuous dynamic recrystallisation. By analysing the evolution of Kernal Angle Misorientation (KAM), it is shown that recovery has more effect on the lower angle part (< 1°) of local misorientation. If the lower limit of LABs is shift to 0.5°, the evolution of Slab with ε and έ shows clear pattern and increasing trend of Slab with temperature is consistent with temperature effect on sub-grain formation process. With such definition, we can have a better understanding of the microstructure evolution in the dynamic restoration of AA7050.
Date Issued
2020-09-04
Date Acceptance
2020-07-06
Citation
Procedia Manufacturing, 2020, 50, pp.744-748
ISSN
2351-9789
Publisher
Elsevier
Start Page
744
End Page
748
Journal / Book Title
Procedia Manufacturing
Volume
50
Copyright Statement
© 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Sponsor
AVIC Manufacturing Technology Institute
Grant Number
N/A
Source
18th International Conference on Metal Forming 2020 (Virtual)
Subjects
0910 Manufacturing Engineering
1007 Nanotechnology
Publication Status
Published
Start Date
2020-09-13
Finish Date
2020-09-16
Coverage Spatial
Kraków, Poland
Date Publish Online
2020-09-04