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Experimental and finite element simulation of dynamic strain induced phase transformation of low carbon steel

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Document pages: 6 pages

Abstract: The microstructure and mechanical properties of six pass dynamic strain induced transformation (DSIT) hot rolled low carbon steel at different initial rolling temperatures were studied by means of experiment and finite element simulation. For processes 1 and 2, the starting rolling temperature of the last three passes is 10 ℃ higher and 20 ℃ lower than the temperature respectively. The results show that with the rolling process, the rolling force increases and the slab temperature decreases. Before the fourth pass, the slab center temperature is higher than the slab surface temperature. However, during the 4th pass to the 6th pass, the temperature of the slab center and surface are almost the same, but the temperature fluctuation is significant due to the large reduction rate. simulation maximum rolling force and start rolling temperature of each pass agree reasonably with the experimental measurements. It is found that the simulated start temperatures of the slab center in the last three passes are about 5~25°C higher than the temperature for Process 1, and the DSIT condition is better satisfied for Process 2. As a result, Process 2 produces finer grain sizes and higher yield strengths than Process 1.

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