An Analytical Model for the Kinetics of Strain-induced Precipitation in Titanium Micro-alloyed Steels

Wang, Zhenqiang; Yong, Qilong; Sun, Xinjun; Yang, Zhigang; Li, Zhaodong; Zhang, Chi; Weng, Yuqing

doi:10.2355/isijinternational.52.1661

Cited by 26 publications

(10 citation statements)

References 20 publications

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“…The activation energy of atomic diffusion along the dislocation pipe has not been precisely determined, and it is always assumed to be two‐thirds or 0.7–0.8 times of bulk diffusion activation energy. In the present model it is assumed that the nucleation is controlled by bulk diffusion and coarsening is controlled by the effective diffusion coefficient including dislocation diffusion effect .…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

Modeling of Precipitation Behavior of Complex Precipitates in Ferrite and Validation with Experiment

Yang

Jia

et al. 2018

steel research int.

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Based on solid solution theory, mass conservation law and classical nucleation, growth and coarsening theory, a thermo/kinetic model is developed to predict the precipitation behavior of complex precipitates in Nb‐V bearing steel. The equilibrium composition of matrix and precipitates is calculated by the thermodynamic model and is input in the kinetic model to calculate the driving force for precipitation at a given temperature. The diffusivity and concentration of alloying elements is considered in the entire precipitation process. The effect of interfacial energy of precipitates and activation energy on precipitation behavior are studied. Simulation results indicate that the interfacial energy plays a significant role in the entire process of precipitation and there is no overlap between nucleation and coarsening when the interfacial energy is in the range of 0.5–0.55 Jm−2. The mean particle diameter predicted by the proposed model is compared with the experimental results and a good agreement was obtained.

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Section: Calculation Results and Discussionmentioning

confidence: 99%

Modeling of Precipitation Behavior of Complex Precipitates in Ferrite and Validation with Experiment

Yang

Jia

et al. 2018

steel research int.

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“…Similar to recrystallization, the strain induced precipitation occurring mostly during the time interval of the plateau can be supposed to obey Avrami's law, and the precipitated fraction ( X p ) can be expressed as:

X_{normalp} = 1 - exp [ln 0.95 {(\frac{t}{t_{0.05}})}^{n}]

…”

Section: Resultsmentioning

confidence: 99%

Influence of the Microalloying Elements on the Temporary Inhibition of Static Recrystallization by Strain-Induced Precipitates

Gómez¹,

Quispe

Medina³

2014

steel research int.

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The kinetics of static recrystallization of austenite and its transitory inhibition by straininduced precipitates have been characterized in several microalloyed steels with different compositions. This inhibition can be seen by the formation of "plateaus" in the curves of static recrystallization obtained from isothermal double-deformation tests. The influence of the type of microalloying element (Nb, V, Al) and the mean size of the precipitates on the duration time of the plateau of recrystallization inhibition has been studied and empirical relationships between these variables have been obtained. Al-steels present a much coarser particle size and a considerably shorter plateau compared to Nb and V-microalloyed steels.

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“…22) A larger solubility product of VC in high Mn steel can result in a lower supersaturation degree of VC precipitation, which further leads to a smaller thermodynamic driving force for VC precipitation and a slower precipitation rate in comparison to low Mn steel. According to Yong's theory, 38,39) the relative precipitation-temperature-time (PTT) diagram for VC precipitation can be calculated by the following equation: where t 0.05da that corresponds to the fraction precipitated 5% is defined as the start time of precipitation, t 0da is an almost temperature independent parameter, d d * is the critical diameter of nucleus, ΔG * is the critical nucleation energy, Q is the activation energy for V atom in bulk, β is a parameter introduced in the model, k is the Boltzmann constant and T is the absolute temperature. The detailed description for this model and the parameters used for calculation can be referred to the literature.…”

Section: Vc Precipitation During Aging Treatment After Hot Rollingmentioning

confidence: 99%

Microstructure and Mechanical Properties of a Hot-rolled High Manganese TWIP Steel Containing 0.3%V

Sun

Wang

2020

ISIJ Int.

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In this paper, the microstructure, precipitates and mechanical properties of a 0.3%V-alloying high Mn austenitic TWIP steel after hot rolling and aging treatment were investigated, aimed to improve the yield strength of high Mn austenitic steel. Experimental results showed that an elongated and unrecrystallized grain structure could be obtained at a finish rolling temperature of 850°C or below in 0.3V steel. The amount of VC precipitates was very small and most vanadium remained in solution after hot rolling. Therefore, the solute drag effect of dissolved vanadium rather than the Zener pinning effect of VC precipitates was mainly responsible for the inhibition of recrystallization. The yield strength increase of 0.3V steel with deceasing finish rolling temperature was much more remarkable than that of V-free steel. Quantifying possible strengthening mechanisms revealed that most of the YS increase was due to the dislocation strengthening in 0.3V steel. The aging treatment for 30 min promoted the precipitation of VC, but the precipitation amount was still much less than the equilibrium precipitation amount. The comparative analysis on precipitation kinetics of VC in high Mn and low Mn steels indicated that the former had a more sluggish precipitation rate than the latter. This result was further analyzed in terms of the effect of Mn on the solubility product of VC in austenite.

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An Analytical Model for the Kinetics of Strain-induced Precipitation in Titanium Micro-alloyed Steels

Cited by 26 publications

References 20 publications

Modeling of Precipitation Behavior of Complex Precipitates in Ferrite and Validation with Experiment

Modeling of Precipitation Behavior of Complex Precipitates in Ferrite and Validation with Experiment

Influence of the Microalloying Elements on the Temporary Inhibition of Static Recrystallization by Strain-Induced Precipitates

Microstructure and Mechanical Properties of a Hot-rolled High Manganese TWIP Steel Containing 0.3%V

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