Dimensional Changes and Microstructural Evolution in a B-bearing Steel in the Simulated Forming and Quenching Process

摘要

To improve the modelling of the behaivour of steel profiles in the forming and quenching process, the in- fluences of high-temperature plastic deformation and applied stress on the martensitic transformation were investigated in a B-bearing steel by dilatometric measurements and compression tests. The plastic defor- mation of austenite was found to enhance ferrite formation so significantly that the dilation due to the low-temperature transformation decreases even at a cooling rte of 280deg C/s.