A Material Perspective on Consequence of Deformation Heating During Stamping of DP Steels

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Şimşir_2017_J._Phys.__Conf._Ser._896_012059.pdf

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2017-07-06

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ŞİMŞİR, CANER
Cetin, B.
Efe, Mert
Davut, K.
Bayramin, B.

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Recent studies showed that, during stamping of high strength steels at industrially relevant production rates, local temperature in the blank may rise up to 200°C – 300°C due to deformation heating. Moreover, die temperature may also rise up to 100°C – 150°C for progressive stamping dies. Based on the common assumption that the blank softens as the temperature increases, thermal softening creates a margin in Forming Limit Diagram (FLD) and therefore the FLD determined at room temperature can safely be used for those cases. In this article, the validity of this assumption on DP590 steel is questioned by high temperature tensile tests (RT - 300°C) at various strain rates (10-3 s-1 – 1 s-1). The results indicated a decrease both in uniform and total elongation in 200°C – 300°C range together with several other symptoms of Dynamic Strain Aging (DSA) at all strain rates. Concurrent with the DSA, the simulated FLD confirms the lower formability at high temperature and strain rates. Thus, it is concluded FLD determined at RT may not be valid for the investigated steels.

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/51656

DOI

https://doi.org/10.1088/1742-6596/896/1/012059

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Department of Metallurgical and Materials Engineering, Conference / Seminar

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Citation Formats

C. ŞİMŞİR, B. Cetin, M. Efe, K. Davut, and B. Bayramin, “A Material Perspective on Consequence of Deformation Heating During Stamping of DP Steels,” 2017, vol. 896, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51656.