Excessive damage increase in dual phase steels under high strain rates and temperatures

Date

2020-09-01

Author

Cobanoglu, Merve
Ertan, Rasim K.
Şimşir, Caner
Efe, Mert

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Damage formation in dual phase steels is a complex process and it may be sensitive to the deformation conditions and mechanisms. In this study, the damage parameter is measured and compared under quasi-static and industrial forming conditions (temperatures: 25 vs 200, 300 degrees C and strain rates: 10(-3)vs 10 s(-1)) for DP590 and DP800 steels. Resonance frequency and ultrasonic sound velocity techniques are utilized for the measurements to test the effectiveness and validity of each technique. At a given strain, the damage values can be up to 700% higher at industrial forming conditions, under which dynamic strain aging (DSA) controls the deformation behavior. DSA results in lower formability and is the likely mechanism responsible from the abnormal damage evolution. Measured damage parameters are also confirmed with the void fraction characterization by microscopy, which also provided details on the void shape and distribution with respect to the deformation conditions.

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials, Computational Mechanics

URI

https://hdl.handle.net/11511/51544

Journal

INTERNATIONAL JOURNAL OF DAMAGE MECHANICS

DOI

https://doi.org/10.1177/1056789520958053

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

M. Cobanoglu, R. K. Ertan, C. Şimşir, and M. Efe, “Excessive damage increase in dual phase steels under high strain rates and temperatures,” INTERNATIONAL JOURNAL OF DAMAGE MECHANICS, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51544.