Abstract
The TRIP-effect and the deformation behavior of a metastable austenitic steel under tension at a temperature from -120 to +200°C are studied. The original microstructure of the steel consists of austenite and martensite (50 : 50). An optimum combination of the ultimate strength (~2395 MPa) and elongation (28%) is observed at -100°C due to the TRIP effect, which is absent in the steel above 100°C and below -120°C. The methods of DSC and DMA are used to study the transformation temperatures. Analysis of the stress-strain curves, of the temperatures of the phase transformations, and of the fracture surfaces gives grounds to expect changes in the deformation mechanisms at different temperatures.
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