Effect of coarse grain band on the ridging severity of 409L ferritic stainless steel

摘要

A systematic study has been carried out to identify the cause of 'ridging behavior' in 409L grade ferritic stainless steel by studying the sequential changes taking place in the microstructure and crystallographic texture during industrial processing of this steel. Coarse grain sized bands comprised of primarily cube oriented ferritic grains have been found to form inside the cold-rolled and annealed sheets. A direct correlation has been found between the severity of coarse-grain banding and ridging phenomenon. In order to overcome the ridging defect by restricting the formation of coarse grain sized bands, hot-band annealing at sufficiently high temperature (similar to 940 degrees C) has been found to be necessary, prior to the cold-rolling and annealing operation. (C) 2016 Elsevier Ltd. All rights reserved.