Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27626
Title: Competition between work-hardening effect and dynamic-softening behavior for processing as-cast GH4720Li superalloys with original dendrite microstructure during moderate-speed hot compression
Authors: Ning, YQ
Wang, T
Fu, MW 
Li, MZ
Wang, L
Zhao, CD
Keywords: Dislocation
Dynamic-softening (DS)
GH4720Li superalloys
Hot deformation
Microstructural mechanism
Work-hardening (WH)
Issue Date: 2015
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2015, v. 642, p. 187-193 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: Competition between work-hardening effect and dynamic-softening behavior of as-cast GH4720Li superalloys with original dendrite microstructure during moderate-speed deformation was quantitatively investigated in this present paper. Flow behavior for processing the studied alloys with dendrite microstructure behaves typical three stages, caused by the competition effect between work-hardening and dynamic-softening. The relationships between work-hardening rate and true strain and true stress were derived from Kocks-Mecking dislocation relation. The work-hardening effect shows two obvious stages with strain, viz. steady fluctuations and linear decreasing. An obvious work-hardening effect was demonstrated under lower temperature and higher strain rate. The linear relationship of work-hardening rate θ on true stress ε was constructed with the slope only related to annihilation coefficient Ω. The microstructural mechanism of as-cast GH4720Li superalloys during moderate-speed deformation was referred to dislocation multiplication and dendrite fragmentation, and the latter was beneficial to dynamic recrystallization during moderate-speed deformation.
URI: http://hdl.handle.net/10397/27626
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2015.07.007
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

9
Last Week
0
Last month
0
Citations as of Sep 9, 2017

WEB OF SCIENCETM
Citations

10
Last Week
0
Last month
0
Citations as of Sep 23, 2017

Page view(s)

39
Last Week
0
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.