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Microalloyed steel

About: Microalloyed steel is a research topic. Over the lifetime, 2183 publications have been published within this topic receiving 33586 citations.


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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

344 citations

Journal ArticleDOI
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.

317 citations

Journal ArticleDOI
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).

316 citations

Journal ArticleDOI
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.

281 citations

Journal ArticleDOI
TL;DR: A review of the literature has been made, concentrating on the influence of N, V, Ti and the residuals, Cu, Sn, S and P, on the hot ductility of steels.
Abstract: A review of the literature has been made, concentrating on the influence of N, V, Ti and the residuals, Cu, Sn, S and P, on the hot ductility of steels Nitrogen is generally detrimental to ductility in Al containing and microalloyed steels; to avoid transverse cracking the N levels should be kept as low as possible When Ti additions are made to low N, C-Mn-Al steels, (0005 % N) the best ductility is likely to be given by a high Ti : N ratio of 4-5 : 1 For high N steels (001 % N), a low Ti level (001 %) is recommended to reduce the volume fraction of Ti containing particles, but allow precipitation to occur at high temperatures In addition a low soluble Al level is needed to prevent the excess N from combining to form AlN For C-Mn-Nb-Al steels, similar recommendations can be made with regard to adding Ti However, the presence of Nb and Al appears to have little influence on the ductility, since these elements coarsen the Ti containing precipitates Furthermore, once the Ti has combined with the N any remaining N now seems beneficial, possibly because high N contents encourage precipitation at higher temperatures V as a microalloying addition gives better hot ductility than Nb and the product of the V and N has to approach 12×10-3, eg 01 % V and 0012 % N before ductility deteriorates to that normally shown with a 003 % Nb addition S levels should be kept low to reduce the detrimental precipitation of fine sulphides at the γ boundaries Care must be taken with Ca treatment as if the steel is too "clean", none of the Nb may be able to precipitate out prior to straightening Residual levels of Cu> 015% and Sn are detrimental to surface quality and encourage transverse cracking It is found that Cu is deleterious to ductility, but Ni can be added to compensate for this loss It is recommended that the amount of Ni added should be greater than the residual Cu level to be sure of avoiding problems, (Ni : Cu ratio nearer to 15 to 2) Phosphorus although potentially beneficial to ductility can not be recommended unless its segregation during solidification can be reduced

270 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202328
202288
202164
202090
201986
201888