Recrystallization law of micro-carbon low alloy deep drawing dual phase steel

doi:10.13251/j.issn.0254-6051.2020.04.009

Abstract

Abstract: Recrystallization microstructure evolution and recrystallization kinetics of a micro-carbon low alloy steel during batch annealing were studied. According to the calculation of the Johnson-Mell theory and the Arrhenius recrystallization activation energy, the thermodynamic model of the relationship between recrystallization volume fraction and annealing temperature and isothermal time was established, and so was the dynamic model of the relationship between the annealing temperature and the time required for complete recrystallization. The results show that the two models verify each other and the recrystallization incubation period and completion time are shortened with the increase of annealing temperature. At the same temperature, the volume fraction of recrystallization increases until complete recrystallization with the increase of holding time. In addition, it is found that there is a competition phenomenon between recrystallization and phase transformation when annealing temperature is near Ac₁. The recrystallization process is the main phenomenon as the holding time is short while phase transformation process has a perfectly advantage as the holding time is long.

Key words: recrystallization, activation energy, annealing temperature, holding time

CLC Number:

TG142.2

Zhou Liutao, Pan Hongbo, Pan Shuo, Wu Jiewen. Recrystallization law of micro-carbon low alloy deep drawing dual phase steel[J]. Heat Treatment of Metals, 2020, 45(4): 45-50.

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