Kurzfassung
Das Fließspannungsverhalten einer hochlegierten metastabilen Stahlgusslegierung wurde in einem weiten Bereich der Dehnrate (4·10−4 s−1 bis 2200 s−1) unter Zug- und Druckbeanspruchung untersucht. Dabei wurde ein ausgeprägter TRIP(TRansformation Induced Plasticity)-Effekt der austenitischen Legierung auf CrMnNi-Basis beobachtet, welcher zu hohen Festigkeiten und exzellenter Verformbarkeit führt. Bei Temperaturen oberhalb von 60°C bis 100°C zeigte sich zusätzlich eine mechanische Zwillingsbildung (TWIP- Effekt). Ein besonderes Augenmerk lag auf der Untersuchung der durch die mechanische Beanspruchung hervorgerufenen Mikrostrukturentwicklung. Es wurde festgestellt, dass erhöhte Beanspruchungsgeschwindigkeiten wesentlich das Werkstoffverhalten der untersuchten Legierungen beeinflussen. Mit steigender Dehnrate erfolgt eine Erwärmung der Probe, welche der Entstehung von α'-Martensit entgegenwirkt und so maßgeblich das Verfestigungsverhalten des Werkstoffes beeinflusst.
Abstract
The mechanical behaviour of a high alloyed and meta-stable cast steel alloy was examined under tensile and compressive loading in a wide range of strain rate (4·10−4 s−1 up to 2200 s−1). The CrMnNi-based alloy showed a distinctive TRIP-effect, resulting in high strength and also excellent ductility. Additionally, mechanical twinning (TWIP-effect) was observed at temperatures above 60 °C up to 100 °C. A special focus was given to reveal the change in microstructure through mechanical loading. It was found, that there is a significant influence of higher strain rates on mechanical behaviour of the investigated alloy. Heating of the specimen is the consequence of rising strain rates, hindering the formation of α'-martensite and affecting the work hardening of this material strongly.
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