Research on Strengthening and Toughening Mechanism and Production Process of QP Steel
Using the new generation of high-strength and high plasticity steel material M3 microstructure control ideas,QP steel composition design is carried out,and its production process is studied and determined.The results show that based on the C-Si-Mn-Nb composition system,the annealing process of uniformly heating at 640 ℃ for 10 minutes,quenching at 60 ℃,and tempering at 450 ℃ for 3 minutes can obtain QP steel with a strength of over 1 000 MPa.By adding Mn and Nb,it is possible to avoid the formation of internal and surface cracks in QP steel during casting at temperatures ranging from 950 to 1 150 ℃ while ensuring good cross-sectional shrinkage.
QP steelorganizational regulationstrengthening and toughening mechanismcross-sectional shrinkage rate
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