Research on Rapid-Cooling Press Hardening Process and Its Effect for Formability of Ultra High Strength Steel
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℃ to 800℃.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℃~700℃ can contribute to improve formability of press hardening manufacture.
Press Hardening Steel 22MnB5 Rapid-cooling Process Thermal-mechanical Behavior Formability Numerical Simulation
L.Ying P.Hu X.Zhao D.Y.Shi M.H.Dai H.Y.Yu Y.Chang
School of Automotive Engineering,Faculty of Vehicle Engineering and Mechanics,State Key Laboratory o School of Automotive Engineering,Faculty of Vehicle Engineering and Mechanics,State Key Laboratory o Department of Engineering Mechanics,Faculty of Vehicle Engineering and Mechanics,State Key Laborator
国际会议
沈阳
英文
414-420
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）