Determination of Warm Deep Drawing Behavior of DP590 Steel Using Numerical Modeling and Experimental Process Window

摘要

The present work focuses upon the determination of deep drawing behavior of DP590 steel under different lubricating andwarm forming conditions. The limiting drawing ratio (LDR) was observed to be 1.933 under 673K_Lubricated conditionwhich is 3.53% more than other processing conditions. The modified Johnson–Cook (m-JC) and Johnson–Cook and Zerilli–Armstrong (JC–ZA) constitutive models have been used among which the JC–ZA model along with Hill’48 r-based displayedthe best prediction ability of flow stress and yield locus, respectively. The stretch forming process has been performed to findthe safe forming limits of the material and an effective improvement of 24% has been observed as the temperature increasedfrom 300 to 673 K. Further, the adequate lubrication helped in increasing the strain ratio, thus, helped in increasing the rangeof limiting strains. The strain-based FLD has been converted into stress based and triaxiality and equivalent plastic strainFLD in order to remove excessive dependency over limiting strains. The deep drawing deformation path has been found to belying in the uniaxial stress region of FLD. The best numerically predicted results of thickness distribution and drawn heighthave been obtained using the combination of Hiil’48 r-based yielding function and JC–ZA constitutive model. The coupledeffect of high temperature and lubricating condition helped in increasing the LDR and the uniformity in thickness distributionalong the walls of the deep drawn cup and further helped in reducing the maximum load needed for forming the cup.