Effect of Relative Humidity on the Corrosion Kinetics of HSLA and Low Carbon Steels

This study analyzes the recrystallization behaviour of Ti microalloyed low carbon steels processed by near net shape technology. Faster solidification rates associated with this technology allows for a finer precipitation of TiN particles that are very effective in controlling austenite grain growth during hot working. Furthermore, these small precipitates are shown to be able to retard ecrystallization compared to the kinetics of a plain carbon steel.

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Formation of Ultrafine Grained Low Carbon Steels via Martensite Deformation and Annealing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.15-17.750 ◽

2006 ◽

Vol 15-17 ◽

pp. 750-755 ◽

Cited By ~ 1

Author(s):

H. Azizi-Alizamini ◽

Matthias Militzer ◽

Warren J. Poole

Keyword(s):

Uniform Elongation ◽

Carbon Steels ◽

Grain Structure ◽

Initial Structure ◽

Low Carbon ◽

Low Carbon Steels ◽

Fine Grain ◽

Ultrafine Grained ◽

Kinetics Of

Recently, there has been a large interest in the development of low carbon steels with ultra fine grain structure using lean chemistries. Although these steels typically have superior strength, the lack of work hardening capability limits the uniform elongation and thus the formability of these kinds of steels. It has been reported by Tsuji and co-workers (2002) that straining of martensite as an initial structure can yield an ultra fine grain structure with good combination of strength and ductility. However, the detailed mechanism of the grain refinement has not yet been clarified. In the present work, the annealing behavior of a low carbon martensitic structure with and without deformation at room temperature has been systematically studied. It is proposed that the process of concurrent softening due to recovery and recrystallization and precipitation of carbides is different for the deformed and undeformed materials. Further, preliminary results have been found on the role of substitutional alloying elements such as Mo or Cr on the kinetics of the softening processes.

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Determination of the Recovery Kinetics during the Annealing of Cold Rolled Low Carbon Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.467-470.141 ◽

2004 ◽

Vol 467-470 ◽

pp. 141-146 ◽

Cited By ~ 2

Author(s):

Ane Martínez-de-Guereñu ◽

F. Arizti ◽

Isabel Gutiérrez

Keyword(s):

Coercive Field ◽

Low Temperatures ◽

Low Carbon Steel ◽

Carbon Steels ◽

Low Carbon ◽

Low Carbon Steels ◽

Dislocation Hardening ◽

Cold Rolled ◽

Kinetics Of

A cold rolled low carbon steel has been annealed at sufficiently low temperatures (300 to 500 °C) in order to promote recovery without interaction with recrystallization. The recovery kinetics has been followed by using magnetic coercive field (Hc) measurements. The microstructural changes associated with the observed decrease in Hc, produced by the recovery, have been analysed by TEM observations. The experimental data have been adequately modelled using various formulations reported in the literature. The kinetics of the dislocation hardening contribution to the yield stress has been derived from the kinetics of the coercive field, taking into account the existing linear relationship between both variables.

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Cr Influence on Steel Microstructure and Kinetics of Austenite Decomposition at Near-Bay Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.500-501.311 ◽

2005 ◽

Vol 500-501 ◽

pp. 311-320 ◽

Cited By ~ 2

Author(s):

Andrej Samoilov ◽

Yuri Titovets ◽

Nikolay Y. Zolotorevsky ◽

Gottfried Hribernig ◽

Andreas Pichler

Keyword(s):

Isothermal Transformation ◽

Carbon Steels ◽

Austenite Decomposition ◽

Low Carbon ◽

Transformation Kinetics ◽

Low Carbon Steels ◽

Steel Microstructure ◽

Second Stage ◽

Cr Content ◽

Kinetics Of

An experimental study of Fe-C-Mn-Cr low-carbon steels with varying Cr content is presented. Pronounced bay and a near-stasis behavior were shown in the alloy with 1.1% Cr. Isothermal transformation at temperatures roughly between 500 and 600°C reveals two pronounced stages. SEM examination of the microstructures showed that the rapid first stage is controlled by carbide-free bainite formation while the slow second stage is controlled by a eutectoid-type reaction. Some microstructure features of the transformation were noted and discussed. Based on experimental observations, a model of austenite decomposition was developed to account for the main features of transformation kinetics in the alloys with varying Cr content.

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