Abstract
The tensile tests of hot formed steels with strength grades of 1500, 1800 and 2000 MPa at strain rates of 0.001~500 S−1 were carried out by using electronic universal testing machine and Zwick high speed tensile testing machine respectively. The strength indexes of three experimental steels, the plastic elongation strength Rp0.2 and the tensile strength Rm are quantitatively analyzed in combination with dynamic factors. The results show that the strain rate sensitivity of the three experimental steels decreases with the increase of material strength grade. The strain rate sensitivity of RP0.2 of the three experimental steels is higher than that of Rm. Both RP0.2 and Rm of the 1500 MPa test steel show obvious strain rate sensitivity, and the strain rate sensitivity is the highest in the strain rate range from 100 to 500 s−1. Rm of the 1800 MPa test steel and RP0.2 and Rm of the 2000 MPa test steel have no obvious strain rate sensitivity, indicating that with the increase of material strength grade, the softening effect caused by the adiabatic temperature rise gradually counteracts the strain rate strengthening effect. The plasticity index of the test steel after fracture shows obvious strain rate sensitivity at strain rates from 1 to 500 s−1, mainly due to the obvious effect of adiabatic temperature rise. The phenomenon of adiabatic temperature rise cannot be ignored at high strain rates.
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Cao, G., Li, J., Song, Q., Dong, X., Song, J. (2023). Analysis of Dynamic Mechanical Behavior of Hot Formed Steel. In: Proceedings of China SAE Congress 2021: Selected Papers. Lecture Notes in Electrical Engineering, vol 818. Springer, Singapore. https://doi.org/10.1007/978-981-19-3842-9_67
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DOI: https://doi.org/10.1007/978-981-19-3842-9_67
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