| A new type of microstructural banding, which consists of conventional bainite (CB) and acicular ferrite (AF), was found while investigating the processing and properties of a new type of high strength microalloyed low carbon bainitic plate steels. Both the rolling schedule and chemical composition can contribute to microstructural banding.;The main objective of this study was to find the cause of microstructural banding in hot rolled low carbon microalloyed steels, and to develop new rolling schedules to produce a uniform acicular ferrite structure.;A group of 4 experimental steels were used for this study. Two investigations were carried out: plate quenching experiments and single deformation laboratory experiments. In the plate quenching experiments, the sequence of microstructure evolution that leads to microstructural banding during hot rolling was determined and new processing schedules were designed to prevent banding. (Abstract shortened by UMI.)... |
