Microstructural features and precipitation behavior of Ti, Nb and V microalloyed steel during isothermal processing

Zhou, Qi; Li, Zhuang; Wei, Zhanshan; Wu, Di; Li, Jinyu; Shao, Zhenyao

doi:10.1007/s42243-018-0215-z

Cited by 15 publications

(9 citation statements)

References 27 publications

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“…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%

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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Section: Introductionmentioning

confidence: 99%

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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“…Based on Zhang's model, Lin and colleagues [24] predicted the activity of SiO 2 at 1600 • C. The model's predicted SiO 2 activity values align closely with data reported in the literature, highlighting the significance of accurately predicting the activity of each component in slag for refining process improvement. Subsequently, metallurgists developed models such as KTH and optical basicity based on the activity of slag to predict the relationship between sulfide capacity and slag composition [25][26][27][28][29][30][31]. While there are discrepancies in their forecasts, Li [32] utilized the two referenced models to conduct a statistical validation of the sulfide capacity predictions for the CaO-SiO 2 -MgO-Al 2 O 3 -Fe x O slag system at 1500 • C. Concurrently, Wang and colleagues provided experimental corroboration for these predictions [33].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Investigation of the Deep Desulfurization of 5 wt% Si High-Silicon Austenitic Stainless Steel

Dou,

Guo,

Guo

et al. 2024

Processes

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Given the demand for extremely low sulfur content in 5 wt% Si high-silicon austenitic stainless steel (SS-5Si), smelting utilizes a slag composition of CaF2-CaO-Al2O3-MgO-SiO2 with a basicity of 1 to 3, Al2O3 content ranging from 2.04 to 9.61%, and CaF2 content between 20.8 and 31.62%. Experiments designed to investigate the sulfur content in molten steel at temperatures of 1773 K, 1823 K, and 1873 K over durations of 1, 5, 10, 15, and 30 min, under varying slag compositions, corroborated with a theoretically derived model hypothesizing a “rate-controlling” step in mass transfer, revealed that the mass transfer of sulfur within the molten steel was determined to be the rate-controlling step (RCS) in the (CaO) + [S] = (CaS) + [O] reaction kinetics, and the variability of the mass transfer coefficient of sulfur, kS,m, in the molten steel ranged from 1.04 × 10−5 m∙s−1 to 2.24 × 10−5 m∙s−1. Based on the temperature dependency of kS,m, the apparent activation energy for the desulfurization reaction was estimated to be 96.03 kJ/mol. Considering the slag components, the binary basicity, denoted as R, exerted an overriding influence on the process of desulfurization. At a basicity of 1, the sulfur content within the liquid steel was reduced, from 22 ppm to 11 ppm within a time span of 30 min. In contrast, an increase in the basicity to a value of 3 showed a significant consequence: over an identical temporal duration of 30 min, the sulfur content was drastically reduced to 2.2 ppm. By contrast, an initial surge in desulfurization rates is observed within the first five minutes, attributable to relatively lower concentrations of Al2O3 and higher levels of CaF2. Subsequently, these parameters exert no significant influence on the kinetics of the desulfurization process.

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“…Titanium carbonitride precipitates in Tibearing microalloyed steels always were used to pin grain boundary migration during heat treatment process and refined the grain size of the microalloyed steels, enhancing mechanical properties of the steels, however, they also had negative effects on the hot ductility of Ti-bearing microalloyed steels. [11][12][13] Spradbery and Mintz [14] and Beal et al [15] found that fine precipitates of titanium nitride (TiN), titanium carbide (TiC) particles with sharp edges and corners in Ti-bearing steels induced original cracks and deteriorated the hot ductility of the steels. Liu et al [16] and Qian et al [17] reported that Ti (C,N) particles precipitated on the grain boundaries in Ti-bearing steel with Ti of 0.02-0.10 wt% pined the grain boundaries migration and prevented the occurrence of dynamic recrystallization, [18] accelerating the crack expansion and leading to brittle fracture of the casting billet.…”

Section: Introductionmentioning

confidence: 99%

Hot Ductility Evolution Mechanism of Titanium‐Bearing Microalloyed Steels

Liu

Zheng

et al. 2023

steel research int.

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Titanium‐bearing (Ti‐bearing) microalloyed steels have high strength and toughness by grain refinement effect of carbonitride precipitates. However, they can induce surface cracks of continuous casting slab when the Ti alloyed content is high. A microalloyed steel with Ti content (0.10–0.15 wt%) is carried out by thermalmechanical simulator over 600–1350 °C to analyze hot ductility evolution mechanism. Fracture surface morphology, phase transition, and behavior of precipitates of the tensile samples are investigated by experimental detection and thermodynamic calculation. The ductility–temperature curves show that the third brittle temperature range is 600–890 °C, which is mainly attributed to the thin proeutectoid ferrite film and precipitated titanium carbonitride particles, widening the embrittlement temperature ranges through of steel. In addition, the tensile samples at 890–1350 °C have good hot ductility, indicating the dynamic recrystallization of deformed austenite can trigger grain boundaries migration away from cracks and avoid the side effect of the Ti (C,N) particles on hot ductility. The first brittle temperature range of 1350 °C‐melting point is mainly ascribed to the partial melting of the grain boundaries with element segregation of sulfur and phosphorus, and microporosity loose among dendrites.

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Microstructural features and precipitation behavior of Ti, Nb and V microalloyed steel during isothermal processing

Cited by 15 publications

References 27 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

Kinetic Investigation of the Deep Desulfurization of 5 wt% Si High-Silicon Austenitic Stainless Steel

Hot Ductility Evolution Mechanism of Titanium‐Bearing Microalloyed Steels

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