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Determination and predication of formability on 22MnB5 steel under hot stamping conditions using Gleeble

ABSTRACT Hot stamping process is a thermo-mechanical process in which blank is heated to austenitization temperature and then subsequent forming and quenching are done simultaneously. Due to complex process cycle in hot stamping conditions, like high temperature and cooling etc., determination of formability is difficult. Therefore, in this work a series of experiment was performed on thermomechanical simulator (Gleeble-3800) at different temperatures (750oC, 800 oC, 850 oC) and strain rates (0.01/s, 0.1/s, 1/s) to obtain flow behavior and formability of 22MnB5 Steel. Due to limitation of the uniaxial deformation in Gleeble-3800, modified tensile specimen was used to obtain plain strain conditions. Thickness gradient-based necking criterion was validated for high temperature forming at different strain rates. This criterion was further used to determine the formability of 22MnB5 steel. Thickness distribution and thickness gradient for modified specimen and simple tensile specimen is observed under various conditions. It was found that with increase in temperature and strain rate formability of 22MnB5 steel increased as well as uniform deformation occurs. Thickness gradient necking criteria indicates that at point of necking thickness gradient ratio falls below the critical value of 0.92. .