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Effects of microstructure on the variation of the unloading behavior of DP780 steels

Pavlina, Erik J., Lin, Chengjiang, Mendiguren, Joseba, Rolfe, Bernard F. and Weiss, Matthias 2015, Effects of microstructure on the variation of the unloading behavior of DP780 steels, Journal of materials engineering and performance, vol. 24, no. 10, pp. 3737-3745, doi: 10.1007/s11665-015-1671-2.

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Title Effects of microstructure on the variation of the unloading behavior of DP780 steels
Author(s) Pavlina, Erik J.
Lin, Chengjiang
Mendiguren, Joseba
Rolfe, Bernard F.ORCID iD for Rolfe, Bernard F. orcid.org/0000-0001-8516-6170
Weiss, Matthias
Journal name Journal of materials engineering and performance
Volume number 24
Issue number 10
Start page 3737
End page 3745
Total pages 9
Publisher Springer
Place of publication Berlin, Germany
Publication date 2015-10
ISSN 1059-9495
1544-1024
Keyword(s) dual-phase steel
elastic modulus
microstructure
springback
Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
HIGH-STRENGTH STEELS
DUAL-PHASE STEELS
PLASTIC-DEFORMATION
TRIP STEELS
STRAIN
MODULUS
SHEET
ROBUSTNESS
MARTENSITE
Summary The nonlinear unloading behavior of three different commercial dual-phase steels (DP780 grade equivalent) was examined. These steels exhibited small variations in chemical composition (0.07 to 0.10 mass percent carbon) and martensite volume fraction (0.23 to 0.28), and they demonstrated similar hardening behavior. Uniaxial loading-unloading-loading tests were conducted at room temperature and quasi-static strain rates between engineering strains of 0.5 and 8%. Steel microstructures were examined using electron backscatter diffraction and nanoindentation techniques. The microplastic component of the unloading strain exhibited no dependence on the martensite volume fraction or the ferrite grain size within the small range encountered in this investigations. Instead, the magnitude of the microplastic component of the unloading strain increased as the strength ratio between the martensite and ferrite phases increased. Correspondingly, the apparent unloading modulus, or chord modulus, exhibited a greater reduction for equivalent increments of strain hardening as the strength ratio increased. These results suggest that springback can be reduced in structures containing two ductile phases if the strength ratio between the harder and softer phases is reduced.
Language eng
DOI 10.1007/s11665-015-1671-2
Field of Research 0912 Materials Engineering
091207 Metals and Alloy Materials
091006 Manufacturing Processes and Technologies (excl Textiles)
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2015
Copyright notice ©2015, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078853

Document type: Journal Article
Collections: School of Engineering
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