Indexed by:会议论文

Date of Publication:2013-01-01

Included Journals:CPCI-S、Scopus

Volume:1532

Page Number:414-420

Key Words:Press Hardening Steel; 22MnB5; Rapid-cooling Process; Thermal-mechanical Behavior; Formability; Numerical Simulation

Abstract:In this study, a new rapid-cooling process in press hardening based on theoretical analysis, experimental test and optimal formability simulation were investigated for improving formability and obdurability of 22MnB5 boron steel. A series of non-isothermal flow behaviors in different plastic strain rates from 0.001s-1 to 0.1s-1 was investigated by thermal-mechanical uniaxial tensile tests. Furthermore, martensite transformation measurement was also involved in the temperature range from 600 degrees C to 800 degrees C. According to an interrelated Norton- Hoff constitutive model was developed to describe the complicated thermal-mechanical-phase transformation couple model, a typical deep drawing box used to simulate formability so as to compare with actual press hardening experiments used by the self-developed multi-field coupled static-explicit FE software KMAS and dynamic-explicit commercial software LS-DYNA respectively. The results showed the rapid-cooling process indicate the validity and efficiency of meeting the forming performance characteristics and the optimal process which temperature range from 650 degrees C similar to 700 degrees C can contribute to improve formability of press hardening manufacture.