Prediction of Forming Limit Diagrams for 22MnB5 in Hot Stamping Process
Prediction of Forming Limit Diagrams for 22MnB5 in Hot Stamping Process
复制标题
DOI：
10.1007/s11665-013-0491-5
复制
发表时间：
2013-08-01
影响因子：
2.3
通讯作者：
Li, Guangyao
中科院分区：
文献类型：
--
作者：
Li, Hongzhou;Wu, Xin;Li, Guangyao
超高强度钢的热冲压工艺具有许多优于常规常温成形工艺的特点，在提高车身产品强度和轻量化方面具有较大的吸引力。然而，22MnB5热冲压钢的力学行为和失效行为都受到应变硬化、温度、应变速率和显微组织的强烈影响。本文采用改进的各向异性屈服准则，结合两种不同的强化规律，描述了22MnB5材料在热冲压温度和应变速率范围内的材料屈服和流动行为。利用M-K理论建立了高温成形极限图(ET-FLD)。通过将我们的预测结果与文献中在等温条件下的实验数据进行比较，验证了所建立的模型。在此基础上，讨论了平衡等温条件下温度和应变速率对22MnB5钢成形极限曲线的影响。在此基础上，进行了非等温瞬变条件下的瞬变成形过程模拟，得到了瞬变成形极限图。
Hot stamping of ultra-high strength steels possesses many superior characteristics over conventional room temperature forming process and is fairly attractive in improving strength and reducing weight of vehicle body product. However, the mechanical and failure behavior of hot stamping boron steel 22MnB5 are both strongly affected by strain hardening, temperature, strain rate, and microstructure. In this paper, the material yield and flow behavior of 22MnB5 within the temperature and strain rate range of hot stamping are described by an advanced anisotropic yield criterion combined with two different hardening laws. The elevated temperature forming limit diagram (ET-FLD) is constructed using the M-K theoretical analysis. The developed model was validated by comparing our predicted result with experimental data in the literature under isothermal conditions. Based on the verified model, the influence of temperature and strain rate on the forming limit curve for 22MnB5 steel under equilibrium isothermal condition are discussed. Furthermore, the transient forming limit diagram is developed by performing a transient forming process simulation under non-isothermal transient condition.