Punch Stretch Test for TRIP690 and DP780 Steel at Elevated Temperatures

Robert Krupa

doi:10.4028/www.scientific.net/MSF.854.118

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HomeMaterials Science ForumMaterials Science Forum Vol. 854Punch Stretch Test for TRIP690 and DP780 Steel at...

Punch Stretch Test for TRIP690 and DP780 Steel at Elevated Temperatures

Abstract:

The forming at elevated temperatures for Advanced High Strength Steels (AHSS) opens up a new technology. The phase changes during warm deformation are the key to understanding the warm forming process. The desired microstructure and mechanical properties before and after warm forming have to be known in order to find optimal conditions for achieving good sheet formability and preferred material properties in service. In this work, the TRIP690 and DP780 steels are investigated under punch stretch test conditions in order to evaluate the temperature influence on neck formation and fracture occurrence at ambient and elevated temperatures 200oC, 400oC. Contact heat treatment was used for heating up the circular specimens. It was found that formability of the investigated steels was drastically reduced at a temperature of 400oC and brittle fracture occurred because of temper embrittlement. It is recommended to avoid steel tempering at this critical temperature.

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Periodical:

Materials Science Forum (Volume 854)

Pages:

118-123

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.854.118

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Online since:

May 2016

Authors:

Robert Krupa*

Keywords:

Retained Austenite Stability, Temper Embrittlement, TRIP Effect, Warm Sheet Metal Forming

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Creative Commons CC BY 4.0

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* - Corresponding Author

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