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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: A detailed and systematic investigation is urgently needed to look into the various aspects of precipitation in IFHS steels as discussed by the authors, which will help in maximising the strengthening effects of P, without any degradation of the deep drawability of the steels.
Abstract: Precipitation in IFHS steels affects texture formation during annealing, which in turn determines the formability. The single most important type of precipitates in IFHS steels is FeTiP. Precipitation of FeTiP leads to the decrement in the intensity of the favourable {111} texture, which causes a degradation of the formability properties. The batch annealed steels are particularly susceptible to this. Since formation of FeTiP as well as of the other types of precipitates in IFHS steels is dependent on steel composition and processing parameters, a detailed and systematic investigation is urgently needed to look into the various aspects of precipitation in IFHS steels. Proper scientific investigation is expected to provide necessary processing windows that will not allow formation of unwanted precipitates. This will help in maximising the strengthening effects of P, without any degradation of the deep drawability of the steels.

21 citations

Journal ArticleDOI
TL;DR: In this article, the fracture toughness of UFG microalloyed and interstitial free (IF) steels was analyzed using transmission electron microscopy (TEM) and Electron backscatter diffraction (EBSD).

21 citations

Journal ArticleDOI
TL;DR: In this article, a study of solidification phenomena performed under industrial conditions is presented, where the solidification structure of high carbon, medium carbon and micro-alloyed steel grades was observed and correlated to casting parameters such as superheat and secondary cooling.
Abstract: A study of solidification phenomena performed under industrial conditions is presented. The solidification structure of high carbon, medium carbon and microalloyed steel grades was observed and correlated to casting parameters such as superheat and secondary cooling. Experimental data of dendrite morphology are related to calculated solidification variables. The calculation is based on the solution of the enthalpy balance equation. An expression for the dependence of secondary dendrite arm spacing on solidification variables is proposed for columnar growth. The results are compared to the findings of other authors. The effect of chemical composition on secondary dendrite arm spacing was observed. Therefore the developed relationships are extended to carbon content on the basis of the presented experimental data.

21 citations

Journal ArticleDOI
TL;DR: In this article, the deformation state of austenite was examined metallographically in detail and it was found that annealing twins were formed abundantly in the austenites during heating before rolling, or during recrystallization in a high temperature.
Abstract: A 0.1%C-1.35%Mn-0.03%Nb steel was hot rolled in a single pass up to 83% reduction in thickness at a temperature between 790°C and 1 050°C and the deformation state of austenite was examined metallographically in detail. It was found that annealing twins were formed abundantly in the austenite during heating before rolling, or during recrystallization in a high temperature. Rolling at a temperature below the recrystallization temperature of austenite resulted in a severe deformation of these annealing twins. At the same time, a heavy local deformation was introduced into the regions near boundaries of these annealing twins, and also near austenite grain boundaries. Such a local concentration of deformation was found to enhance the formation of ferrite nuclei in these regions during the subsequent ferrite-pearlite transformation. It was suggested that this effect was most essential in the grain refinement of control-rolled steel.

21 citations

Journal ArticleDOI
TL;DR: In this paper, multipass torsion tests were performed on an Nb-microalloyed steel at decreasing temperatures so as to analyze the effect of strain reversal in the strain accumulation region on the γ-→-α transformation kinetics.
Abstract: Multipass torsion tests were performed on an Nb-microalloyed steel at decreasing temperatures so as to analyze the effect of strain reversal – in the strain accumulation region – on the γ → α transformation kinetics. Strain reversal involved a significant delay in the start of the transformation as well as a microstructural transient compared to monotonic strain conditions. However, after several passes with no reversal performed within the inter-critical temperature region, both types of tests led to similar microstructures.

21 citations


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