Thermomechanical and Microstructural Analysis of the Influence of B- and Ti-Content on the Hot Ductility Behavior of Microalloyed Steels

Gontijo, Marina Melo; Chakraborty, Arnab; Webster, Richard F.; Ilie, Sergiu; Six, Jakob; Primig, Sophie; Sommitsch, Christof

doi:10.3390/met12111808

Cited by 3 publications

(3 citation statements)

References 54 publications

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“…Moreover, the addition of Ti reduces the amount of AlN and NbN [95,96]. It should be noted that, with an increase in the strain rate from 10 -4 to 10 -2 s -1 , a decrease in the amount of BN and TiN precipitates and an increase in their size was observed, which was accompanied by an improvement in hot ductility [96].…”

Section: Effect Of Boron Nitridementioning

confidence: 90%

“…More recent works have focused on studying the effect of co-microalloying with boron and titanium [91][92][93][94][95][96]. In the experiments, a cooling rate of 3 • C/s was used.…”

Section: Effect Of Boron Nitridementioning

confidence: 99%

“…This was due to the inhibition of the formation of intergranular ferrite by the segregation of dissolved boron at the grain boundary, since titanium prevented the binding of boron to nitride due to the formation of TiN. Moreover, the addition of Ti reduces the amount of AlN and NbN [95,96]. It should be noted that, with an increase in the strain rate from 10 -4 to 10 -2 s -1 , a decrease in the amount of BN and TiN precipitates and an increase in their size was observed, which was accompanied by an improvement in hot ductility [96].…”

Section: Effect Of Boron Nitridementioning

confidence: 99%

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Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

Зайцев

Arutyunyan

Koldaev

2023

Metals

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High-strength micro-alloyed steels are widely used in various branches of technology and industry due to the simultaneous combination of high indicators of strength, ductility, fatigue, corrosion resistance, and other service properties. This is achieved due to the reasonable choice of the optimal chemical composition and parameters of temperature deformation treatment of steel that provide a synergistic effect on the dispersed microstructure and characteristics of excess phase precipitates, which control the achievement of these difficult-to-combine properties of rolled products. Additionally, the improvement of the level and stability of these properties, as well as the prevention of the occurrence of defects, is largely determined by the indicators of the homogeneity of the composition, structure by volume and manufacturability of the metal, and primarily hot ductility, which are controlled by the presence of precipitation of excess phases, including micro-alloying elements. In accordance with the circumstances noted, in the present review, a generalization, systematization, and analysis of the results of the studies are conducted on the effect of phase precipitates on the hot ductility and homogeneity of composition and structure, depending on the chemical composition and parameters of the temperature-deformation treatment of steel.

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Section: Effect Of Boron Nitridementioning

confidence: 90%

“…More recent works have focused on studying the effect of co-microalloying with boron and titanium [91][92][93][94][95][96]. In the experiments, a cooling rate of 3 • C/s was used.…”

Section: Effect Of Boron Nitridementioning

confidence: 99%

Section: Effect Of Boron Nitridementioning

confidence: 99%

See 1 more Smart Citation

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

Зайцев

Arutyunyan

Koldaev

2023

Metals

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Diffusion behavior of bismuth in eco-friendly Bi–S based free cutting steel at high temperature

2023

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Deformation cracks during continuous casting and hot rolling are easy to occur in the Bi–S based free cutting steel, and the cracks are related to the diffusion of bismuth. The diffusion behavior of bismuth in the steel and the effect of the microstructure and alloying elements were studied by the diffusion annealing experiment combined with SEM, EDS and TEM analysis. The results show that the bismuth tends to diffuse along the grain boundaries (GBs) and the interfaces between the MnS phase and steel matrix, and then enrich to form the bismuth phases. The bismuth phases with lower melting point would be in liquid form at high temperature and resulted in the cracks along the GBs and interfaces. The bismuth diffusion is more likely to occur toward the parallel rolling direction than the vertical rolling direction in the steel because of the pearlite and MnS phases with the long strip shape and banded distribution. The addition of boron and titanium has the effect of inhibiting the diffusion of bismuth in the steel, which is mainly attributed to the faster diffusion rate of boron and the priority to occupy the defect sites of the GBs and the interfaces between the MnS phase and steel matrix.

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The Influence of Thermomechanical Conditions on the Hot Ductility of Continuously Cast Microalloyed Steels

Sharifi,

Bakhtiari,

Shahryari

et al. 2024

Materials

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Continuous casting is the most common method for producing steel into semi-finished shapes like billets or slabs. Throughout this process, steel experiences mechanical and thermal stresses, which influence its mechanical properties. During continuous casting, decreased formability in steel components leads to crack formation and failure. One reason for this phenomenon is the appearance of the soft ferrite phase during cooling. However, it is unclear under which conditions this ferrite is detrimental to the formability. In the present research, we investigated what microstructural changes decrease the formability of microalloyed steels during continuous casting. We studied the hot compression behaviour of microalloyed steel over temperatures ranging from 650 °C to 1100 °C and strain rates of 0.1 s−1 to 0.001 s−1 using a Gleeble 3800® (Dynamic Systems Inc, Poestenkill, NY, USA) device. We examined microstructural changes at various deformation conditions using microscopy. Furthermore, we implemented a physically-based model to describe the deformation of austenite and ferrite. The model describes the work hardening and dynamic restoration mechanisms, i.e., discontinuous dynamic recrystallisation in austenite and dynamic recovery in ferrite and austenite. The model considers the stress, strain, and strain rate distribution between phases by describing the dynamic phase transformation during the deformation in iso-work conditions. Increasing the strain rate below the transformation temperature improves hot ductility by reducing dynamic recovery and strain concentration in ferrite. Due to limited grain boundary sliding, the hot ductility improves at lower temperatures (<750 °C). In the single-phase domain, dynamic recrystallisation improves the hot ductility provided that fracture occurs at strains in which dynamic recrystallisation advances. However, at very low strain rates, the ductility decreases due to prolonged time for grain boundary sliding and crack propagation.

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Thermomechanical and Microstructural Analysis of the Influence of B- and Ti-Content on the Hot Ductility Behavior of Microalloyed Steels

Cited by 3 publications

References 54 publications

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

Diffusion behavior of bismuth in eco-friendly Bi–S based free cutting steel at high temperature

The Influence of Thermomechanical Conditions on the Hot Ductility of Continuously Cast Microalloyed Steels

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