Effect of Ti/V ratio on thermodynamics and kinetics of MC in γ/α matrices of Ti–V microalloyed steels

Zhang, Ke; Sun, Xinjun; Li, Zhaodong; Xu, Kun; Jia, Ting; Zhu, Zhenghai; Ye, Xiao-yu; Kang, Jun-yu; Yong, Qilong

doi:10.1007/s42243-020-00539-1

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…The kinetic model is based on the following assumptions: (1) MC particles nucleate on the dislocation line, and the nucleation rate rapidly decays to zero; (2) the edge dislocation is considered as the nucleation positions of precipitated particles; (3) the shape of precipitation is considered to spheroid. Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 . The nucleation rate and precipitation start time of precipitates in different temperatures can be calculated by Formulas (7) and (8), respectively [ 15 , 24 , 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The supersaturated solute microalloying elements will further precipitate in the ferrite during the coiling process. Compared to austenite, the precipitation precipitated in ferrite is smaller in size, thereby producing stronger precipitation strengthening [ 18 , 19 , 26 ]. It should be noted that the contents of solid solution of microalloying elements and carbon in the austenite at 860 °C are used as the initial content in the ferrite calculation model.…”

Section: Resultsmentioning

confidence: 99%

“…The kinetic model in ferrite needs to introduce shape factors η , whereas d * and Δ G * are transformed into d d * and Δ G d * . Therefore, Equations (7) and (8) have been changed to Equations (12) and (13), respectively [ 24 , 25 , 26 ].

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Han

Yang

et al. 2022

Materials

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In this work, the precipitates in Ti−Mo−V steel were systematically characterized by high-resolution transmission electron microscopy (HRTEM). The thermodynamics and kinetics of precipitates in Ti−Mo and Ti−Mo−V steels were theoretically analyzed, and the effect of vanadium on the precipitation behavior was clarified. The results showed that the precipitation volume fraction of the Ti−Mo−V steel was significantly higher than that of Ti−Mo steel. The randomly dispersed precipitation and interphase precipitation (Ti, Mo, V)C particles coexisted in the Ti−Mo−V steel. When the temperature was higher than 872 °C, the addition of vanadium could increase the driving force for (Ti, Mo, V)C precipitation in austenite, resulting in an increased nucleation rate and shortened incubation period, promoting the (Ti, Mo, V)C precipitation. When the temperature was lower than 872 °C, the driving force for (Ti, Mo, V)C precipitation in austenite was lower than that for (Ti, Mo)C precipitation, and the incubation period of (Ti, Mo, V)C precipitation was increased. Moreover, it was also found that the precipitated-time-temperature curve of (Ti, Mo, V)C precipitated in the ferrite region was “C” shaped, but that of (Ti, Mo)C was “ε” shaped, and the incubation period of (Ti, Mo, V)C was significantly shorter than that of (Ti, Mo)C.

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Section: Resultsmentioning

confidence: 99%

“…Then, the interfacial energy and driving force of (Ti, Mo)C and (Ti, Mo, V) can be expressed as [ 24 , 25 , 26 ]:

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

where the meanings and units of different symbols are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Han

Yang

et al. 2022

Materials

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“…Figure 11a,b provides the NrT curve (nucleation rate-temperature curve) and PTT curve (precipitation-time-temperature curve) of (Nb, V, Ti) C in austenite in the VL and VH steels, respectively, calculated by the method published in references [27][28][29][30][31][32]. Figure 11c provides the percentage of (Nb, V, Ti) C precipitated in austenite calculated by the same method.…”

Section: Effect Of V Content On Hot Ductilitymentioning

confidence: 99%

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

Song

Tian

Xiao³

et al. 2021

Metals

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Hot tensile tests were conducted in this study to investigate the effect of strain rate (10−3 and 10 s−1) and vanadium content (0.029 and 0.047 wt.%) on the hot ductility of low-carbon microalloyed steels. The results indicate that a hot ductility trough appears at a low strain rate (10−3 s−1) because of the sufficient time for ferrite transformation and the growth of second particles, but it disappears at a high strain rate (10 s−1). The hot ductility is improved with the increase in strain rate at 700 °C or higher temperatures. In addition, with the increase in vanadium content, the large amounts of precipitate and increased ferrite transformation result in poor hot ductility of steels fractured at a low temperature range (600~900 °C). However, when the steel is fractured at a high temperature range (1000~1200 °C), more vanadium in the solid solution in the austenite inhibits the growth of parental austenite grains and results in grain refinement strengthening, slightly improving the hot ductility.

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The effect of carbon source and molar ratio in Fe–Ti–C system on the microstructure and mechanical properties of in situ TiC/Fe composites

Xu¹,

Kou²,

Yang³

et al. 2022

Ceramics International

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Effect of Ti/V ratio on thermodynamics and kinetics of MC in γ/α matrices of Ti–V microalloyed steels

Cited by 12 publications

References 33 publications

Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Effect of V on the Precipitation Behavior of Ti−Mo Microalloyed High-Strength Steel

Effect of Vanadium and Strain Rate on Hot Ductility of Low-Carbon Microalloyed Steels

The effect of carbon source and molar ratio in Fe–Ti–C system on the microstructure and mechanical properties of in situ TiC/Fe composites

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