Prediction of Forming Limit Diagrams for 22MnB5 in Hot Stamping Process
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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.
KeywordsBBC2005 yield function forming limit diagrams hot stamping process mechanical characterization non-isothermal deformation
The support from the National 973 Project of China (2010CB328005), Key Project of NSFC of China (61232014), the National Natural Science Foundation of China (11202072) and the Doctoral Fund of Ministry of Education of China (20120161120005) is acknowledged. The first author is also grateful for the supports from China Scholarship Council (2011613057).
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