Abstract
This paper introduces a new generation of industrially available cold rolled TWIP steel. The TWIP900 is a high manganese steel with approx. 19% manganese and shows a stable austenitic structure at room temperature. The focus of the paper is on the forming behavior, which is remarkable compared to other industrially available sheet metal materials. The key figures of this cold rolled narrow strip are a tensile strength of 900 MPa in combination with an elongation at fracture of 40%. The forming behavior of the material is characterized in tensile tests, bulge tests, and Nakazima tests. A material model for forming simulations is set up and a comparison between different material models is done. Then deep drawing experiments are carried out and numerically simulated. Finally, a flanging and springback study is carried out. A comparison between simulation and experiment demonstrates the good quality of currently industrially applied simulation techniques for TWIP steels.
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