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Microalloyed steel

About: Microalloyed steel is a(n) research topic. Over the lifetime, 2183 publication(s) have been published within this topic receiving 33586 citation(s).


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TL;DR: In this paper, a series of dual-phase (DP) steels containing finely dispersed martensite with different volume fractions of martensites (Vm) were produced by intermediate quenching of a boron- and vanadium-containing microalloyed steel.
Abstract: A series of dual-phase (DP) steels containing finely dispersed martensite with different volume fractions of martensite (Vm) were produced by intermediate quenching of a boron- and vanadium-containing microalloyed steel The volume fraction of martensite was varied from 03 to 08 by changing the intercritical annealing temperature The tensile and impact properties of these steels were studied and compared to those of step-quenched steels, which showed banded microstructures The experimental results show that DP steels with finely dispersed microstructures have excellent mechanical properties, including high impact toughness values, with an optimum in properties obtained at ∼055 Vm A further increase in Vm was found to decrease the yield and tensile strengths as well as the impact properties It was shown that models developed on the basis of a rule of mixtures are inadequate in capturing the tensile properties of DP steels with Vm>055 Jaoul-Crussard analyses of the work-hardening behavior of the high-martensite volume fraction DP steels show three distinct stages of plastic deformation

318 citations

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TL;DR: In this article, the authors used torsion tests to determine the Zener-Hollomon parameter in a selection of 18 steels with compositions appropriate for the study of the influence of each alloying element (C, Mn, Si, Mo, Ti, V, Nb).
Abstract: Using torsion tests the Zener-Hollomon parameter has been determined in a selection of 18 steels with compositions appropriate for the study of the influence of each alloying element (C, Mn, Si, Mo, Ti, V, Nb) on the Zener-Hollomon parameter ( ϵ exp ( Q RT ) = A( sinh ασ p ) n ). It is demonstrated that all the alloying elements influence, to a greater or lesser extent, the activation energy (Q). A rise in the content of any alloy was found to increase the activation energy, except in the case of carbon which has the opposite effect. An expression is given for Q as a function of the content of each alloying element and the second side of the equation is completed by determining the optimum values of α and n for all the steels, giving 0.01187 MPa−1 and 4.458, respectively. It is demonstrated that A is not a constant but is a function of the activation energy. In this way it is possible to calculate the peak stress (σp) at any temperature and strain rate for any low alloy or microalloyed steel in the austenite phase. This study brings a new dimension to the Zener-Hollomon parameter and potentially improves its applications, for example in the calculation of stress-strain curves.

285 citations

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TL;DR: In this paper, a model to describe the precipitation kinetics during isothermal holding following high temperature deformation in Nb-containing steels is presented. But the model is based on the assumption that heterogeneous nucleation of precipitates on dislocations and enhanced coarsening due to pipe diffusion are responsible behind the accelerated kinetics observed in strain induced precipitation.
Abstract: Strain induced precipitation is a key phenomenon that controls the microstructure evolution during the finish rolling stages of microalloyed steels. Extensive research has shown that the precipitation of Nb(CN) delays the onset of recrystallisation. This paper presents a model to describe the precipitation kinetics during isothermal holding following high temperature deformation in Nb-containing steels. The model is based on the assumption that heterogeneous nucleation of precipitates on dislocations and enhanced coarsening due to pipe diffusion are responsible behind the accelerated kinetics observed in strain induced precipitation. Results show a very good agreement between reported experimental observations and predictions of the present model for precipitate size and volume fraction evolution.

280 citations

Journal ArticleDOI

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TL;DR: The Sheffield Leicester Integrated Model for Microstructural Evolution in Rolling (SLIMMER) as discussed by the authors was developed for hot rolling of flat products and used to calculate rolling loads and torques with an accurate prediction of mean flow stress.
Abstract: By collaborative work the Sheffield Leicester Integrated Model for Microstructural Evolution in Rolling (SLIMMER) has been developed for hot rolling of flat products. The background physical metallurgy is presented together with the expressions used to describe microstructure evolution for a range of ferrous and non-ferrous metals. The finite difference thermal model at the heart of SLIMMER computes heat loss to air, descalers, rolls and water cooling while allowing for oxidation and deformation heating. The use of temperature compensated time enables isothermally determined equations for microstructure evolution to be applied to practical non-isothermal conditions. Rolling loads and torques are calculated using Sims theory with an accurate prediction of mean flow stress. Examples of rolling niobium microalloyed steel plate and the effect of initial grain size illustrate the capabilities of SLIMMER and show some of the validation of the predictions.

266 citations

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TL;DR: In this article, a theory of anisotropic ductile fracture is outlined and applied to predict failure in a low alloy steel, and a rate-dependent version of the theory is employed to solve boundary value problems.
Abstract: A theory of anisotropic ductile fracture is outlined and applied to predict failure in a low alloy steel. The theory accounts for initial anisotropy and microstructure evolution (plastic anisotropy, porosity, void shape, orientation and spacing) and is supplemented by a recent micromechanical model of void-coalescence. A rate-dependent version of the theory is employed to solve boundary value problems. The application to the studied steel relies on material parameters inferred from quantitative metallography measurements. The quantitative prediction of damage accumulation and crack initiation in notched bars is achieved without any adjustable factor and is discussed under various stress states and loading orientations.

245 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20222
202163
202090
201986
201888
2017116