Advanced high-strength steels (AHSS) despite excellent properties with low weight and high strength have the concern of high springback occurrence. The amount of springback can be reduced by hot forming process. In this paper, the influence of temperature rises on the springback quantities generated potentially during a hot stamping process of the DP780 steel is investigated. To obtain a proper description for hardening behavior, a type of the Chaboche thermomechanically constitutive model has been used in conjunction with an anisotropic Yld2000-2D yield criterion. Since the elastic modulus of the AHSS during loading and unloading stages can make considerable influences on the springback, consideration of Young’s modulus as a function of equivalent plastic strain is necessary. Moreover, the process is simulated via ABAQUS software implementing UMAT and VUMAT user-defined subroutines as well as the forward Euler explicit integration scheme is applied to calculate the stress and strain at the end of time increments. The results demonstrate the efficiency of the novel temperature-dependent Chaboche model to predict the level of stresses and temperature during and after hot stamping process.

先进的高强度钢（AHSS）尽管具有重量轻，强度高的优异性能，但回弹率却很高。可以通过热成型工艺减少回弹量。在本文中，研究了温度升高对DP780钢热冲压过程中可能产生的回弹量的影响。为了获得对硬化行为的正确描述，已将一种Chaboche热力学本构模型与各向异性的Yld2000-2D屈服准则一起使用。由于在加载和卸载阶段AHSS的弹性模量会对回弹产生很大影响，因此有必要考虑将杨氏模量作为等效塑性应变的函数。此外，通过使用UMAT和VUMAT用户定义的子例程的ABAQUS软件模拟该过程，并应用前向Euler显式积分方案来计算时间增量结束时的应力和应变。结果证明了新颖的依赖温度的Chaboche模型能有效预测热冲压过程中和之后的应力和温度水平。