MICROSTRUCTURE AND TEXTURE DEVELOPMENT IN WARM ROLLED HIGH STRENGTH IF STEELS CONTAINING Cu, P AND B

摘要

Warm rolling or ferritic rolling of low carbon steels and interstitial free steels is gaining importance due to its potential to broaden the product range and reduce the production cost. The present paper discusses the evolution of microstructures and textures in Cu, B and P containing IF steels after multipass warm rolling with one finish rolling temperature (FRT) and fixed amount of deformation in ferritic region. The effect of warm rolling on Cu precipitation during ageing was also studied. It has been found that like cold rolling, warm rolling does not affect the kinetics of the Cu precipitation to that extent because of the occurrence of Cu precipitation during rolling and cooling. Very strong y and a textures were developed after warm rolling in both the steels. In order to further strengthen the y texture and also to extract the maximum benefit of precipitation, both the steels were given special heat treatment. TEM study was carried out in order to characterize the microstructures and Cu precipitation.