Influence of Microstructure on Springback of Cold-Rolled TRIP Steel Sheet

초록

The springback of cold-rolled transformation-induced plasticity (TRIP) steel was examined through V-bending forming tests. Prior to the testing, the steel specimens were subject to different austempering temperatures (300, 350, and 400 degrees C), so as to induce variations in the microstructure. The microstructure at different points of interest was analyzed via EBSD and XRD. It was revealed that the amount of springback decreased as the austempering temperature increased. The amount of springback in the TRIP steel was dependent on the fraction of retained austenite; the springback decreased as the fraction of retained austenite increased. As the retained austenite volume and area fraction was increased 2X or more, the amount of springback was reduced by 29.3% as the austempering temperature was raised from 350 to 400 degrees C. The springback was, for the most part, not dependent on the specimen orientation about the rolling direction.

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