Investigation and Modeling of Austenite Grain Evolution for a Typical High-strength Low-alloy Steel during Soaking and Deformation Process

doi:10.1007/s40195-021-01330-1

Abstract

Abstract:

The final mechanical properties of components greatly depend on their grain size. It is necessary to study the grain evolution during different thermomechanical processes. In the study, the real-time austenite grain evolution of a high-strength low-alloy (HSLA) steel during the soaking process is investigated by in situ experiments. The effects of different deformation parameters on the dynamic recrystallization (DRX) kinetic behaviors are investigated by hot compression experiments. Based on the observations and statistics of the microstructures at different thermomechanical processes, a unified grain size model is established to evaluate the effects of soaking parameters and deformation parameters on the austenite grain evolution. Also, the DRX kinetic model and critical strain model are established, which can describe the effects of the soaking process on the DRX kinetics process well. The established grain size model and DRX kinetic model are compiled into the numerical simulation software using Fortran language. The austenite grain evolution of the material under different deformation conditions is simulated, which is consistent with the experimental results. It indicates that the established model is reliable, and can be used to simulate and predict the grain size during different thermomechanical processes accurately.

Key words: High-strength steel, Grain growth, Dynamic recrystallization, Grain size model, Numerical simulation

Ming-Jie Zhao, Liang Huang, Chang-Min Li, Jia-Hui Xu, Xu-Yang Li, Jian-Jun Li, Peng-Chuan Li, Chao-Yuan Sun. Investigation and Modeling of Austenite Grain Evolution for a Typical High-strength Low-alloy Steel during Soaking and Deformation Process[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 996-1010.

Figures/Tables 20

Fig. 1 Initial microstructure of the experimental material

Fig. 2 Experimental procedure for in situ observations

Fig. 3 Experimental procedure for hot compression experiments

Fig. 4 Microstructures at soaking temperature of a 1173 K, b 1273 K, c 1373 K, and d 1473 K and soaking time of 600 s

Fig. 5 Microstructures at the soaking time of a 0 s, b 180 s, c 300 s, d 480 s and the soaking temperature of 1473 K

Fig. 6 Average austenite grain size at different soaking processes

Fig. 7 Microstructures at the deformation temperature of 1273 K, strain rate of 0.01 s-1, austenitizing temperature and strain of a 1173 K and 1.2, b 1473 K and 1.2, c 1473 K and 0.1, d 1473 K and 0.35

Fig. 8 Average grain size at a different austenitizing temperatures; b different strains

Fig. 9 Microstructures at the austenitizing temperature of 1473 K, strain of 1.2 and deformation temperature and strain rate of a 1273 K and 0.1 s-1, b 1273 K and 10 s-1, c 1173 K and 0.01 s-1, d 1473 K and 0.01 s-1

Fig. 10 Average grain size at a different strain rates and b different deformation temperatures

Fig. 11 Comparison between the experimental and calculated values of average austenite grain size

Fig. 12 Comparison between the experimental and calculated values of average DRX grain size

Fig. 13 Relationship between the hardening rate and flow stress

Fig. 14 Typical stress-strain curves obtained by hot compression experiments

Fig. 15 Variation of critical strain and peak strain at different deformation conditions

Fig. 16 Comparison between the experimental and calculated strain: a $\mathrm{ln}{\varepsilon }_{\mathrm{c}}$, b $\mathrm{ln}{\varepsilon }_{\mathrm{p}}$

Fig. 17 DRX kinetic curves at a strain rate of 0.01 s-1, and b deformation temperature of 1273 K

Fig. 18 Comparison between the experimental and predicted average DRX grain size at the austenitizing temperature of 1473 K, strain rate of 0.01 s-1, deformation temperature of 1273 K, and strain of 0.1-1.2

Fig. 19 DRX map at the strain of 1.2

Fig. 20 Average DRX grain size at a strain of 1.2

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