The effect of strain rate on the properties and microstructure of the DC 06 steel

Abstract

The effect of strain rate on the process of flat forming at room temperature has not been clearly defined yet. So far, the effect of strain rate has only been assessed for hot forming technology. The current industry specialising in flat forming technology place great emphasis on the reduction of material consumption and the number of rejected pressed parts, on the increase of productivity and quality of work, use of advanced pressing machines (e.g. servo presses), etc. All the aforesaid make us ask how to modify the boundary conditions of the pressing process in order to meet the requirements. It shows that standard conditions influencing the pressing process, e.g. pressure generated by the holder, lubrication, application of draw beat, are not able to influence the process to the full extent and it is necessary to seek potential in other boundary conditions. It becomes more and more obvious that strain rate has a major impact on the pressing process. This article aims to describe the influence of strain rate on the formability in flat forming technology and on the behaviour of microstructure after deformation in various material lots of the DC06 steel.