Abstract
Due to their enormous potential for energy absorption, high-alloy TRIP/TWIP steels are designed to fulfill contrary requirements of crash-relevant structures such as strength, toughness, and ductility and even excellent weldability. To further optimize these mechanical properties and reduce the production costs at the same time, high-alloy TRIP/TWIP steels with an increased content of carbon and nitrogen and decreased amount of nickel are produced. The mechanical properties of the base materials and the capability for the phase transformation are determined for different temperatures (−40 to +60 °C) in quasistatic tensile tests. In comparison, welding experiments with an electron beam are performed and the microstructure is examined via light optical microscopy. The welded sheets are also tested and the mechanical properties determined via micro-hardness measurements and quasistatic tensile tests. While a TRIP effect is noticeable during loading at room temperature, optimal properties of the base material can be achieved at temperatures below 0 °C. The welded samples show a ferritic–austenitic microstructure and solidified as primary ferritic with joint austenite and ferrite formation in the solidification interval.
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