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Dynamic strain aging in DP steels at forming relevant strain rates and temperatures
Date
2017-09-17
Author
BAYRAMIN, Berkay
Simsir, Caner
Efe, Mert
Metadata
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Mechanical testing of dual phase (DP) steels at low strain rates (10(-3) s(-1)) have shown that they are susceptible to dynamic strain aging (DSA) between 100 degrees C-400 degrees C. During industrial forming processes at intermediate strain rates (1-10(2) s(-1)), the local temperatures may rise to the DSA range due to deformation heating which may disturb the exceptional formability of these steels. In this study, two grades of DP steel (DP590 and DP800) are tested at thermomechanical conditions relevant to forming and the effects of DSA on the formability are established. Test results show that the DSA controls the deformation between 200 degrees C-300 degrees C through serrations in the stress-strain curves of both grades. With increasing strain rates (up to 1 s(-1)) and temperatures, DSA intensifies and results in severe drops in uniform and total ductility with negative strain rate sensitivity, indicating poor formability at these conditions. A detailed analysis of the serrations coupled with dislocation density measurements by x-ray analysis suggests that the serrations can be linked to a periodic microstructural feature.
Subject Keywords
Dual-phase steels
,
DSA
,
Formability
,
Warm forming
,
Dislocation cells
URI
https://hdl.handle.net/11511/56761
Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
DOI
https://doi.org/10.1016/j.msea.2017.08.006
Collections
Department of Metallurgical and Materials Engineering, Article
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B. BAYRAMIN, C. Simsir, and M. Efe, “Dynamic strain aging in DP steels at forming relevant strain rates and temperatures,”
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
, pp. 164–172, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56761.