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Department of Mechanical Engineering

Formability of High Temperature Stainless Steel Grades

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in
  • Sonderverfahren
  • RECIMP
  • Materialcharakterisierung
  • Industrienahe Forschung
Experimentally determined forming limit curves and geometry of utilized specimen © IUL
Experimentally determined forming limit curves and geometry of utilized specimen
Funding ReCIMP
Contact

Florian Weber M. Sc.

The investigation on the formability of austenitic and ferritic high temperature stainless steels focuses on the substitution of austenitic steel grades. These steel grades are applied due to their better formability, but implicate a significantly worse CO2 footprint compared to ferritic grades. Knowledge about the formability enables a targeted substitution suitable for the complexity of the product. The formability of the different materials is evaluated by forming limit curves determined by Nakajima tests and notched tensile tests. The materials with high formability show a limited applicability in Nakajima tests. In case of notched specimens, the material flows from unnotched areas of the Nakajima specimens, resulting in cracks outside the range of validity. Therefore, upcoming investigations focus on the optimization of the specimen geometry. Furthermore, the manufacturing process of the specimen and its influence on the crack initiation are under investigation.