Precipitation in Microalloyed Steel by Model Alloy Experiments and Thermodynamic Calculations

Frisk, Karin; Borggren, Ulrika

doi:10.1007/s11661-016-3639-8

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…Figure 4 presents some of their calculated values of carbonitride compositions compared to experimental values. These results have afterwards been used in other assessments such as Frisk´s [23,24]. In the work with Borggren [24] Frisk compared model results with calculations with other databases and with previous experimental results, indicating good agreement and some limitations.…”

Section: Equilibrium Of Carbonitrides With Austenitementioning

confidence: 87%

A Brief Thermodynamic Evaluation of Precipitation Models in Microalloyed Steels

Silva¹

2018

ABM Proceedings

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Resumo The knowledge of the amount of microalloying elements in solution and precipitated during processing of steels is very important to properly design steel and thermomechanical processing (TMP). Models have been formulated to describe the precipitation phenomena during TMP in detail. Some of these models use simple solubility products, however, together with complex phenomenological equations to describe the changes in the steel during TMP. In this work two of these simple solubility products frequently used are compared with results calculated with computational thermodynamics. The results suggest that they are not able to predict the same values as those calculated by computational thermodynamics. If the later are correct, the simple solubility products are probably introducing excessive "correcting" factors in the phenomenological equations in order to reproduce experimental results. Furthermore, if this is the case, the ability of the models to extrapolate, a basic condition in alloy design, can be questioned..

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Section: Equilibrium Of Carbonitrides With Austenitementioning

confidence: 87%

A Brief Thermodynamic Evaluation of Precipitation Models in Microalloyed Steels

Silva¹

2018

ABM Proceedings

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“…Frisk and Borggren [109] have recently extended the earlier model to consider the Fe–Cr–Nb–V-Mo–C–N system. Experimental data were obtained to study the phase separation into V-rich and Nb-rich carbides/carbonitrides and allow comparison with the calculated data.…”

Section: Solubility Of Titanium Compounds In Ironmentioning

confidence: 99%

Titanium microalloyed steels

Baker

2018

Ironmaking & Steelmaking

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For many years titanium has been regarded as a relative minor element in microalloyed steels compared with niobium and vanadium. However, over the past decade or so, titanium compounds in microalloyed steels have been recognized as having a wider role than just involved in austenite grain refinement.This is considered in the present review. The background and brief history are followed by sections dealing with the physical state of titanium and compounds of titanium, including borides, carbides, nitrides, oxides and sulphides characterized in MA steels. Many of the investigations on the solubility of these compounds in iron, and the precipitates they form, are considered, which leads to their functions in controlling the mechanical and toughness properties of MA steels.This now often involves the multiple alloying additions of titanium, niobium and vanadium with both carbon and nitrogen, and the morphologies of the various precipitates characterized in MA steels is presented. Titanium has become an important element in the development of line pipe steels, which for the higher grades have moved to bainite/acicular ferrite microstructures. The influence of Ti in the nucleation of acicular ferrite is an active research area, particularly with regard to the use made of titanium compounds in welding of MA steels. Finally, consideration is given to the influence of titanium on hot ductility and how titanium additions behave during continuious casting and thin slab direct charging processes.

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“…These steels are characterized by a large difference in hardness between the ferrite matrix (soft polygonal ferrite) and hard structural components (martensite, bainite, etc.). Therefore, it is not possible to achieve high values for the hole expansion ratio, which is associated with the formation of cavities at the interface between the ferrite matrix and the hard structural components during stamping [14]. As a result, in spite of satisfactory values of the relative elongation, steels are characterized by an extremely low or even complete lack of stamping.…”

Section: Promising Directions Of Using Phase Precipitates For the Primentioning

confidence: 99%

“…As a result, the choice of the composition and parameters of steel treatment, in many ways is done by the method of trial and error using extremely simplified empirical relationships. Only recently, methods of thermodynamic modeling and calculation of steel treatment processes have been intensively developed [4,14,29]. Herewith, assuming the achievement of global or local equilibrium without taking into account deformation, only the total content of the formed phase is calculated.…”

Section: Promising Directions Of Using Phase Precipitates For the Primentioning

confidence: 99%

Promising directions of increasing the properties of steel

Зайцев¹,

Koldaev²,

Arutyunyan³

2018

Nanosystems: Phys. Chem. Math.

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The study of regularities of the formation and evolution of nonmetallic inclusions and phase precipitates in modern structural steels has been carried out. It has been shown that the formation of several types of complex nonmetallic inclusions results in a substantial increase in the complex of steel properties and neutralizing the negative influence of impurities while a reduction in costs. An even more significant improvement in the properties of steel can be achieved by controlling the characteristics of carbide, carbonitride, and other types of phase precipitates. Herewith, ferritic steels are the most promising. The previously unreachable complex of indicators of difficult to combine service properties of these steels has been achieved by the formation of a homogeneous fine-dispersed microstructure and a volumetric system of primarily interphase precipitates. Based on established principles, effective technologies for the production of a wide range of various types of steels have been developed.

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Precipitation in Microalloyed Steel by Model Alloy Experiments and Thermodynamic Calculations

Cited by 11 publications

References 18 publications

A Brief Thermodynamic Evaluation of Precipitation Models in Microalloyed Steels

A Brief Thermodynamic Evaluation of Precipitation Models in Microalloyed Steels

Titanium microalloyed steels

Promising directions of increasing the properties of steel

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