Abstract
In order to investigate the roll bonding of high-alloy transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) steel, roll-bonded sheets of the TRIP and TWIP steel were manufactured starting from hot rolling, followed by brushing and cold rolling. Both, the microstructure and mechanical properties of the roll-bonded sheets were characterized by metallographic investigations, and tensile and T-peel tests. Preliminary results, such as an occurrence of an adhesive bonding between two TWIP steel sheets and between TRIP and TWIP steel sheet after a thickness reduction of approximately 50% were obtained. Moreover, the formation of deformation-induced martensite leads to outstanding mechanical properties of the roll-bonded composite sheet. An ultra-fine grained microstructure was observed in the bonding zone after only one roll-bonding process. The obtained promising results demonstrate the possibility of the development of an accumulative roll-bonding process for TRIP/TWIP steel composites.
Highlights
IntroductionTransformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) steels own high strength, formability, and energy absorption capacity because of their high work hardening capacity [1]
Transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) steels own high strength, formability, and energy absorption capacity because of their high work hardening capacity [1].These outstanding properties are related to either the transformation induced plasticity (TRIP) or TWIP effect, which are based on special deformation mechanisms resulting in higher ductility and strength compared to conventional deformation with a regular dislocation glide
Sheets of high alloy TRIP and TWIP steels have been produced from cast plates through hot rolling
Summary
Transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) steels own high strength, formability, and energy absorption capacity because of their high work hardening capacity [1] These outstanding properties are related to either the TRIP or TWIP effect, which are based on special deformation mechanisms resulting in higher ductility and strength compared to conventional deformation with a regular dislocation glide. In the case of TRIP steels, the improvement is attributed to the formation of α0 - and/or ε-martensite [2], while in the case of TWIP steels, the improvement is due to the higher amount of shear resulting from the formation of twins during plastic deformation [3] Both mechanisms result in a reduction of the mean free path for dislocation glide known as “dynamic Hall-Petch effect”. The austenite stability and stacking fault energy mostly depends on the chemical composition and temperature, which determine the difference of the Gibbs free energies of fcc austenite and bcc martensite themselves [2,5,6]
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