Abstract
Dynamic deformation behavior of a cold-rolled Fe-1.47Mn-1.40Si-0.21C-0.025Nb transformation-induced plasticity (TRIP)-aided steel was studied at strain rates in the range of 0.01-200 s−1. An understanding of dynamic deformation behavior is important from the perspective of automotive applications and there exists a gap in the knowledge. A novel approach of using a tensile specimen with variable cross section is proposed to realize the controllable strain experiment and study the dynamic deformation process. The study indicated that the increase of adiabatic temperature during dynamic tensile deformation increased the additional mechanical driving force, leading to increase in the stability of retained austenite (RA). The degree of transformation and the rate of transformation of RA during dynamic tensile straining was less than the quasi-static tensile deformation. The microstructure of experimental steel was mainly composed of polygonal ferrite, bainite and RA, and majority of large blocky RA at the ferrite grain boundaries transformed to martensite during the initial stage of dynamic deformation. With the increase of strain, RA with smaller average grain size transformed to martensite. At the end of deformation, only a few small granular RA that was too stable did not transform. With the increase of strain rate from 0.01 to 200 s−1, both yield strength and ultimate tensile strength (UTS) of the experimental steel increased monotonously. However, the total elongation (TEL) initially decreased and then increased. The experimental steel exhibited remarkable mechanical properties with the product of UTS and TEL (PSE) of 25.6 GPa% at strain rate of 200 s−1. The study underscores the significance of strain rate in designing TRIP steel.
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Acknowledgments
The research was supported by the National Natural Science Foundation of China (Grant No. 51874088), Fundamental Research Funds for the Central Universities (Grant No. N2002015), Natural Science Foundation of Fujian Province [No. 2021J05224] and Scientific Research Foundation of Fujian University of Technology (GY-Z21009). The authors are grateful to Dr. R.D.K. Misra for helpful discussion and continued collaboration.
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Tang, Z.Y., Huang, J.N., Ding, H. et al. Dynamic Deformation of Low-Alloyed Transformation-Induced Plasticity-Aided Steel from Low to High Strain Rates. J. of Materi Eng and Perform 31, 10035–10043 (2022). https://doi.org/10.1007/s11665-022-06967-2
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DOI: https://doi.org/10.1007/s11665-022-06967-2