Abstract
Experimental investigations of the plastic instability phenomenon in a hot-rolled medium manganese steel were performed. The effects of tensile deformation in a temperature range of 20–140°C on the microstructure, mechanical properties, and flow stress serrations were analyzed. The Portevin–Le Chatelier (PLC) phenomenon was observed for the specimens deformed at 60 °C, 100 °C, and 140 °C. It was found that the deformation temperature substantially affects the type and intensity of serrations. The type of serration was changed at different deformation temperatures. The phenomenon was not observed at room temperature. The plastic instability occurring for the steel deformed at 60 °C was detected for lower strain levels than for the specimens deformed at 100 °C and 140 °C. The increase of the deformation temperature to 100 °C and 140 °C results in shifting the PLC effect to a post uniform deformation range. The complex issues related to the interaction of work hardening, the transformation induced plasticity (TRIP) effect, and the PLC effect stimulated by the deformation temperature were addressed.
Highlights
IntroductionA growing interest in medium manganese steels related to their advantageous strength-ductility balance has prompted a better understanding of their behavior during plastic deformation [1,2,3,4]
A growing interest in medium manganese steels related to their advantageous strength-ductility balance has prompted a better understanding of their behavior during plastic deformation [1,2,3,4].Medium manganese steels contain 3–12% Mn and other alloying additions, such as Al and Si
The complex issues related to the interaction of work hardening, the transformation induced plasticity (TRIP) effect, and the Portevin–Le Chatelier (PLC) effect stimulated by the deformation temperature were addressed
Summary
A growing interest in medium manganese steels related to their advantageous strength-ductility balance has prompted a better understanding of their behavior during plastic deformation [1,2,3,4]. Medium manganese steels contain 3–12% Mn and other alloying additions, such as Al and Si. In the present work, Mo addition is added due to its strong solid solution strengthening potential [3]. Low-C (i.e., ~0.1%) steels containing ~3% Mn show ferritic-martensitic microstructures in the initial state [1]. When the manganese content rises, the initial microstructure (after cold rolling) changes to low-C martensite [2]. Medium-Mn steels can be obtained as cold-rolled [5] or hot-rolled [6] sheets
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