Effects of rolling and coiling temperature on the microstructure and mechanical properties of hot-rolled high strength complex phase steel

Effect of coiling temperature on impact toughness of hot rolled ultra-high-strength multiphase steel strips

“…Regarding thermomechanically processed and controlled cooled high-strength strip steels, the role of processing parameters such as soaking temperature, start-and finish-rolling temperatures, rolling reduction ratio, cooling start-and end temperatures and cooling rate on the microstructure and mechanical properties have been studied extensively [4][5][6]. It is noteworthy that UHSS strips (< 10 mm thickness) are usually coiled after finish rolling, and use accelerated cooling to a lower temperature range (typically, 350 -460 C) to achieve high strength by the formation of bainite-martensite mixed microstructures [7][8][9][10][11][12][13]. An increase in strength, however, is often accompanied by a decrease in ductility and impact toughness [14].…”