Abstract
A tailored tempering process, whereby the cooling rate for the sheet is controlled to form regions with very high strength and regions of reduced strength but increased ductility. In order to obtain the optimal mechanical properties for CSC-15B22 steel sheets that undergo tailored tempering, experimental and simulation method are used to examine the tempering process. The heated die section is heated from 150℃ to 500℃ to determine the effect of tooling temperature on the properties of the sheets. Results show that the section that is heated to a temperature of 150℃ is too strong to absorb energy due to an impact. The section that is heated to 500℃ shows a significant difference between the strength of the sheet for the heated and cooled sections of the tooling. The strength at the heated section is insufficient for vehicle B-pillars. For sheets that are heated to 350℃, a slight hot stamping effect is seen in the heated section of tooling. The strength of the steel sheet is increased and elongation is sufficient. An impact test result shows that if the tooling is heated to a temperature of 350℃, the formed steel sheet absorbs the greatest amount of impact energy.
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