Ferrite Phase Transformation Model of DP600 Hot Rolled Dual-Phase Steel Under ESP Process

doi:10.12068/j.issn.1005-3026.2024.04.004

Abstract

Abstract:

In order to establish ferrite phase transformation kinetics mathematical model of DP600 hot rolled dual-phase steel under the ESP process condition， the isothermal phase transformation and continuous cooling phase transformation experiments were conducted on the experimental steel by using the dynamic phase transformation dilatometer. Based on the measured ferrite phase transformation incubation time and ferrite volume fraction， the incubation time of ferrite phase transformation was calculated by combining classical nucleation theory above the deformation temperature， and the incubation time of ferrite phase transformation below the deformation temperature was calculated by fitting $? G V$ according to the experimental data. Considering the influence of cooling rate， the additivity rule was modified and based on this， the starting temperature and volume fraction of ferrite phase transformation under continuous cooling conditions were calculated. The results showed that the calculated starting temperature and volume fraction of ferrite phase transformation using the modified phase transformation model are in good agreement with the measured values， which can be used to predict the ferrite phase transformation behavior of DP600 dual-phase steel under the ESP process.

Key words: incubation time, ferrite phase transformation, phase transformation kinetics, mathematical model, prediction

CLC Number:

TG 142

Xiao-guang ZHOU, Xin MA, Shan JIANG, Zhen-yu LIU. Ferrite Phase Transformation Model of DP600 Hot Rolled Dual-Phase Steel Under ESP Process[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 483-489.

Figures/Tables 12

Table 1 Chemical composition of experimental steel （mass fraction）

C	Si	Mn	P	S	N	Al	Cr
0.06	0.46	1.42	0.004 8	0.002 2	0.003 7	0.035	0.38

Fig.1 Process diagram of isothermal phase transformation

Fig.2 Process diagram of continuous cooling phase transformation

Fig.3 Typical microstructure of isothermal condition in the simulating ESP process

Fig.4 Expansion‐time curves of isothermal phase transformation process

Table 2 Incubation time of ferrite phase transformation

温度/℃	665	700	735	760	790
孕育期/s	1.32	1.56	2.28	3.90	17.94

Fig.5 Continuous cooling transformation curves of experimental steel

Fig.6 Microstructure of continuous cooling transformation in simulating ESP process

Table 3 Calculation results of incubation time model parameters

模型中的参数	温度/℃
模型中的参数	850	825	800	775	750	725
$D C γ$ ×10^-14/（m²·s^-1）	2.285 2	1.547 9	1.028 8	0.669	0.426 6	0.265
$? G V$ ×10⁷/［J·（mol·m³）^-1］	-0.132	-2.406	-5.873	-10.597	-16.708	-24.459
$V α$ /m³	1.223	1.221	1.220	1.218	1.216	1.215
$a$ /mm	0.327	0.337	0.337	0.337	0.337	0.336
$τ d$ /s	220	30.5	10.5	5.5	4.02	3.49

Table 3 Calculation results of incubation time model parameters

模型中的参数	温度/℃
模型中的参数	850	825	800	775	750	725
$D C γ$ ×10^-14/（m²·s^-1）	2.285 2	1.547 9	1.028 8	0.669	0.426 6	0.265
$? G V$ ×10⁷/［J·（mol·m³）^-1］	-0.132	-2.406	-5.873	-10.597	-16.708	-24.459
$V α$ /m³	1.223	1.221	1.220	1.218	1.216	1.215
$a$ /mm	0.327	0.337	0.337	0.337	0.337	0.336
$τ d$ /s	220	30.5	10.5	5.5	4.02	3.49

Fig.7 Relationship between ln（ln（1/（1-?φ））） and lnt

Fig.8 Comparison of ferrite phase transformation starting temperature

Fig.9 Comparison of ferrite phase transformation volume fraction

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