Thermodynamic modeling of carbonitride formation in steels with V and Ti

Горбачев, И. И.; Попов, В. В.; Pasynkov, A. Yu.

doi:10.1134/s0031918x12100031

Cited by 19 publications

(6 citation statements)

References 18 publications

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“…e chemical compositional characteristic is the result of subsequent mutual diffusion of element Ti, V, C, and N. Large (Ti, V) carbonitride will transform to the equilibrium state (Ti 0.92 V 0.08 ) (C 0.05 N 0.95 ) when being kept under 1200 °C for a long time. (6) Simply reducing the content of Ti even 13 ppm cannot eliminate the large (Ti, V) carbonitride totally for the nitrogen-containing nonquenched and tempered steel, but the quantity and size of large carbonitride is significantly reduced. However, it is not an economical method and further optimizing the content of V and N without affecting the product performance is the next work.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…e precipitate in Ti-microalloying steel is usually nanosized Ti(Cx,Ny), and the chemical composition of precipitate will be more complex when another microalloying element such as V is also added. I. I. Gorbachev et al made a detailed analysis of the laws of carbonitrides formation for the Fe-V-Ti-C-N system [6]. However, carbonitrides of larger size are often seen in microalloyed steel products [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Large (Ti, V) Carbonitride in Nonquenched and Tempered Steel 38MnVS6

Xie¹,

Meng²,

Deng³

et al. 2022

Advances in Materials Science and Engineering

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Large (Ti, V) carbonitrides with size even up to tens of microns in autoparts steel 38MnVS6 are studied in this work. A great number of micron-sized (Ti, V) carbonitrides are found in continuous casting billet, and the atomic ratios of V/Ti are mainly distributed in range 0.130–0.200 with an average value of 0.171. The large (Ti, V) carbonitrides have irregular morphologies, and some even have an obviously extending shape along the dendrite boundary. 3D morphologies of the large (Ti, V) carbonitride after being etched by AA solution present obvious long and flake shapes. The large (Ti, V) carbonitride has high thermal stability even at 1200°C, even though the atomic ratio of V/Ti has a decreasing tendency. There are still many large (Ti, V) carbonitrides in the rolled bar and partially broken in some which are clearly visible. According to the Thermo-Calc calculation result, the large (Ti, V) carbonitride precipitates in liquid steel during solidification. The chemical compositional characteristic is the result of subsequent mutual diffusion of elements Ti, V, C, and N. Simply reducing the content of Ti, even 13 ppm cannot eliminate the large (Ti, V) carbonitride for the nitrogen-containing, nonquenched, and tempered steel, but the quantity and size of large carbonitride are significantly reduced.

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Section: Conflicts Of Interestmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large (Ti, V) Carbonitride in Nonquenched and Tempered Steel 38MnVS6

Xie¹,

Meng²,

Deng³

et al. 2022

Advances in Materials Science and Engineering

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“…Thermodynamic calculations of phase equilibrium in the Cr 20 Nb 20 Ti 20 V 20 Zr 20 alloy at 800, 1000, 1300, and 1600 °C have been performed based on the CALPHAD-method using the algorithm determined in [ 11 ]. This algorithm was tested previously in thermodynamic calculations for a number of multicomponent systems (see for example [ 12 , 13 , 14 , 15 , 16 ]), and appropriate results were obtained. In this method, the calculation is performed by finding an alloy phase composition corresponding to the global minimum of its Gibbs free energy.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

Microstructural Evolution and Phase Formation in 2nd-Generation Refractory-Based High Entropy Alloys

Эшед¹,

Larianovsky²,

Kovalevsky³

et al. 2018

Materials

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Refractory-based high entropy alloys (HEAs) of the 2nd-generation type are new intensively-studied materials with a high potential for structural high-temperature applications. This paper presents investigation results on microstructural evolution and phase formation in as-cast and subsequently heat-treated HEAs at various temperature-time regimes. Microstructural examination was performed by means of scanning electron microscopy (SEM) combined with the energy dispersive spectroscopy (EDS) mode of electron probe microanalysis (EPMA) and qualitative X-ray diffraction (XRD). The primary evolutionary trend observed was the tendency of Zr to gradually segregate as the temperature rises, while all the other elements eventually dissolve in the BCC solid solution phase once the onset of Laves phase complex decomposition is reached. The performed thermodynamic modelling was based on the Calculation of Phase Diagrams method (CALPHAD). The BCC A2 solid solution phase is predicted by the model to contain increasing amounts of Cr as the temperature rises, which is in perfect agreement with the actual results obtained by SEM. However, the model was not able to predict the existence of the Zr-rich phase or the tendency of Zr to segregate and form its own solid solution—most likely as a result of the Zr segregation trend not being an equilibrium phenomenon.

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“…This increases the driving force in vanadium steels compared to plain carbon steels at the same isothermal transformation temperature below T 0 for a plain carbon steel. Thus, the rate of ferrite separation is greater [22].…”

Section: Introductionmentioning

confidence: 97%