Interface characteristics and precipitation during the austenite-to-ferrite transformation of a Ti-Mo microalloyed steel

Bikmukhametov, Ilias; Beladi, Hossein; Wang, Jiangting; Tari, Vahid; Rollett, Anthony D.; Hodgson, Peter; Timokhina, Ilana

doi:10.1016/j.jallcom.2021.162224

Cited by 5 publications

(5 citation statements)

References 43 publications

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“…Equation (3)–(6) show equilibrium solubility products of VC in austenite and ferrite. [ 21 ]

$$\text{log} \left(\left{\right. \left[\right.

…”

Section: Resultsmentioning

confidence: 99%

“…Equation ( 3)-( 6) show equilibrium solubility products of VC in austenite and ferrite. [21] logf½V ⋅ ½Cg γ ¼ 6.72 À 9500…”

Section: Precipitation Behavior Of Particles In the Steel Matrixmentioning

confidence: 99%

“…In other words, the addition of vanadium, as a substitute to Nb, to HSLA steels can further reduce the cost of production. Although there are studies on the process parameters of TMCP on V-Nb, V-Ti, Nb-Ti, and V-Nb-Ti microalloyed steels and the effect of vanadium addition on microstructure and mechanical properties of the same, [2,7,14,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] there are still a lack of the effects of the FRT and coiling temperature (CT) on the evolution of the microstructures and precipitation behavior of especially V (C, N) in only V microalloyed steel during TMCP. The aim is to understand the relationship between TMCP process, microstructure, and V (C, N) precipitates in V-microalloyed steel and to illustrate the influence of TMCP parameters on nucleation sites of precipitated phase in V-microalloyed steel.…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Wu,

Yang,

Tang

et al. 2024

steel research int.

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Six hot compression tests are conducted using the Gleeble3500 thermomechanical simulator to investigate the microstructural evolution and precipitation behavior in low‐C–Mn V‐microalloyed steel. The specimens are subjected to hot isothermal compression deformation of 87%. The optical microscopy and transmission electron microscopy using carbon extraction replica method are used to characterize the microstructures and precipitation after the simulated thermomechanical controlled process and coiling. The results indicate that increasing the finish rolling temperature benefits the refinement of ferrite grains but has little influence on the refinement of the precipitates. It is also observed that lower coiling temperatures (CTs) promote the formation of fine precipitates. When the CT is 500 °C, the average precipitate size is found to be 86 nm. Furthermore, it is found that the CT significantly influences the nucleation sites of the precipitates inter alia, the matrix, interphase, grain boundaries, and dislocations. As expected, at higher CTs, nucleation is predominantly on the defects rather than the matrix.

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“…Equation (3)–(6) show equilibrium solubility products of VC in austenite and ferrite. [ 21 ]

$$\text{log} \left(\left{\right. \left[\right.

…”

Section: Resultsmentioning

confidence: 99%

“…Equation ( 3)-( 6) show equilibrium solubility products of VC in austenite and ferrite. [21] logf½V ⋅ ½Cg γ ¼ 6.72 À 9500…”

Section: Precipitation Behavior Of Particles In the Steel Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Wu,

Yang,

Tang

et al. 2024

steel research int.

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“…The precipitated phase exhibits a B–N orientation relationship with the ferritic matrix, and the precipitated phase adopts a plate-like morphology. Studies by Bikmukhametov et al [ 17 ] have shown that interphase precipitates form preferentially at K–S interfaces with a close-packed habit plane of (110) α/ /(111) γ and low mobility. The chemical composition of the precipitates is related to their size; smaller V carbides are rich in Fe, while larger precipitates contain Fe only near the matrix/precipitate interface [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of V on the Microstructure and Precipitation Behavior of High-Carbon Hardline Steel during Continuous Cooling

Zhang,

Gu,

Wang

et al. 2024

Materials

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High-carbon hardline steels are primarily used for the manufacture of tire beads for both automobiles and aircraft, and vanadium (V) microalloying is an important means of adjusting the microstructure of high-carbon hardline steels. Using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM), the microstructure and precipitation phases of continuous cooled high-carbon steels were characterized, and the vanadium content, carbon diffusion coefficient, and critical precipitation temperature were calculated. The results showed that as the V content increased to 0.06 wt.%, the interlamellar spacing (ILS) of the pearlite in the experimental steel decreased to 0.110 μm, and the carbon diffusion coefficient in the experimental steel decreased to 0.98 × 10−3 cm2·s−1. The pearlite content in the experimental steel with 0.02 wt.% V reached its maximum at a cooling rate of 5 °C·s−1, and a small amount of bainite was observed in the experimental steel at a cooling rate of 10 °C·s−1. The precipitated phase was VC with a diameter of ~24.73 nm, and the misfit between ferrite and VC was 5.02%, forming a semi-coherent interface between the two. Atoms gradually adjust their positions to allow the growth of VC along the ferrite direction. As the V content increased to 0.06 wt.%, the precipitation-temperature-time curve (PTT) shifted to the left, and the critical nucleation temperature for homogeneous nucleation, grain boundary nucleation, and dislocation line nucleation increased from 570.6, 676.9, and 692.4 °C to 634.6, 748.5, and 755.5 °C, respectively.

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“…The nucleation of ferrite in Fe-X-Y systems (X represents substitutional elements such as Mn, Si, Ni, Cr, Mo, Co, V, Ti, and Nb, and Y represents interstitial elements, such as C and N) has been studied extensively [5], and the investigations have demonstrated that interface character [6,7], carbides [8], austenite grain size [9,10], and compressive stress [11,12] influence ferrite formation.…”

Section: Introductionmentioning

confidence: 99%

The Kinetics of Phase Transition of Austenite to Ferrite in Medium-Carbon Microalloy Steel

Liu

Zhou

2021

Metals

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To reduce energy and resource consumption, high-strength hot-rolled rebars with yield strengths of ≥400 MPa (HRB500) and ≥500 MPa (HRB600) have been designed and produced in recent years. Optimizing the microstructure in the steel to improve strength necessitates determining the kinetics of the phase transition of austenite to polygonal ferrite. Therefore, in the study, the effect of temperature and holding time on the volume fraction of ferrite is investigated in HRB500 and HRB600 steels. Experimental results show that the ferrite percentage initially increases with an increase in temperature and then decreases as the temperature increases from 600 to 730 °C. The optimum temperature range is 680–700 °C for HRB500 steel and 650–680 °C for HRB600 steel. Based on the Johnson–Mehl–Avrami equation, phase transition kinetic models are established. Model predictions are consistent with the validation data. Thus, this study establishes a reference for studying ferrite formation during cooling.

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Interface characteristics and precipitation during the austenite-to-ferrite transformation of a Ti-Mo microalloyed steel

Cited by 5 publications

References 43 publications

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Influence of V on the Microstructure and Precipitation Behavior of High-Carbon Hardline Steel during Continuous Cooling

The Kinetics of Phase Transition of Austenite to Ferrite in Medium-Carbon Microalloy Steel

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