TWIP steel
TWIP steel ( English Twinning Induced Plasticity to German induced by twinning plasticity ) is an austenite - steel grade , wherein at plastic deformation because of a relatively low stacking fault energy intensive 18-45 mJ / m² twinning occurs. This process takes place even at low loads (~ 300 MPa) and strengthens the steel, whereby the elongation at break is over 60%. Because of these properties, it is intended for the manufacture of body parts in the automotive industry, especially in the crumple zone . The greatest hurdle for use in automotive engineering is its tendency to delay cracking due to hydrogen embrittlement .
Chemical properties
TWIP steel has a carbon content of around 0.6%. As alloying elements come manganese (25-30%), aluminum and silicon (up to 2%) for use. According to its main alloying element, TWIP steel is also called high manganese steel.
Mechanical properties
- Young's modulus : 170 GPa
- Breaking strength : 1000 MPa
- Elongation at break > 50%
Web links
- Tim Schröder: Well-cooked steel for the car of tomorrow. In: MaxPlanckResearch 3/2004, pp. 36–42. ( Memento of January 2, 2007 in the Internet Archive ) Retrieved November 6, 2009. (PDF file; 673 kB)
- White, A; Gutte, H .; Scheller, PR: Austenitic TRIP / (TWIP) lightweight steels with high cold formability. Institute for Iron and Steel Technology of the Technical University Bergakademie Freiberg, 2006 , accessed on November 14, 2009 (PDF file; 100 kB)
See also
swell
- ↑ Patent DE102008020757 : Process for forming sheet metal workpieces made of iron-manganese steel. Registered on April 18, 2008 , published on November 6, 2008 , applicant: Volkswagen AG, inventor: Martin Glatzer, Jürgen Kiese, Uwe Paar.