Papers by Keyword: Low Carbon Steel

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Authors: Morteza Toloui, Matthias Militzer
Abstract: Three dimensional (3D) phase field modelling is used to simulate austenite grain growth in X80 linepipe steel for thermal paths that are typical in the heat affected zone (HAZ). In the HAZ austenite grain growth is affected by pinning due to precipitates and their potential dissolution. Effective grain boundary mobilities are introduced that are consistent with strong pinning at lower temperatures and weak pinning at higher temperatures separated by the estimated dissolution temperature range of fine NbC precipitates. These mobility relationships are then used to describe austenite grain growth in bulk samples subjected to rapid heating and cooling conditions to replicate thermal cycles at various positions in the HAZ.
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Authors: Dirk M. Kirch, A. Ziemons, I. Lischewski, Dmitri A. Molodov, Günter Gottstein
Abstract: A novel high temperature heating method in combination with automated EBSD-data acquisition is presented. A commercially available infrared laser is utilized to heat samples up to a temperature of about 1000°C in high vacuum in a SEM while acquiring EBSD-data of the microstructure. First results on the γ-α-γ phase transformation between 840°C and 865°C in a microalloyed ferritic low carbon steel is presented.
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Authors: Hui Guo, Xiao Ran Sun, Shan Wu Yang, Xue Min Wang, Cheng Jia Shang
Abstract: The microstructure evolution and precipitation behavior of two low carbon steels are studied, with 0.05C-0.77%Nb added in one steel and (0.03C-)1.63Cu-0.74%Nb added in the other as a comparison. In the Cu-Nb steel tempered at 600°C for 18 hrs, there are two peaks in the particle size distribution figure, one between 2-3nm formed by NbCN precipitates, and the other, 10-12nm for Cu precipitates. The TEM observation on carbon replica shows that the average particle diameter of NbCN precipitate is 2.81±0.78nm in C-Nb steel, while 4.23±0.95 nm in Cu-Nb steel with lower carbon. The analysis shows that this size increase of NbCN not only decreases the precipitation strengthening, but also weakens significantly the pinning effect on the dislocations, which results in a more serious microstructure softening in Cu-Nb steel.
453
Authors: Wei Li, Shao Fan Wang, Xin Jia
Abstract: This paper applied acoustic emission technology, monitoring low carbon steel uniform corrosion process, obtained low carbon steel corrosion acoustic emission signal in the process of uniform corrosion, And analyzed acoustic emission signal characteristics of the low carbon steel corrosion process applied the method combining characteristic parameters with wavelet packet transform, in the meantime combined the detection data of storage tank, Contrast acoustic emission signal characteristics of low carbon steel corrosion in experiment conditions and acoustic emission signal characteristics of storage tank corrosion in actual conditions, the result provides reference for acoustic emission research of low carbon steel uniform corrosion process and tanks online acoustic emission testing.
246
Authors: Vadim Kovrov, Yuriy Zaikov, Vladimir Tsvetov, Yuriy Shtefanyuk, Vitaliy Pingin, Matvey Golubev
Abstract: Anodic current-supplying pins (ACP) made of low-carbon steel corrode intensively due to the sulfur contamination of the carbon-based Soderberg anode and iron sulfides formation in the present aluminium production technology. The aluminide coatings produced by the liquid-phase method followed by the fluoride flux treatment of the steel samples were applied for the ACP protection. The protective layer based on α-Al2O3 and FeAl2O4 was formed on the steel surface in the course of the test run in the industrial Soderberg anode during the aluminium electrolysis. The aluminized ACP wear rates calculated by the linear extrapolation of data obtained during 150 days workout were 4.0 and 5.4 cm/year for the ACP with the aluminide coating and without it, respectively. The current load on the ACP remained almost the same for the aluminized and original uncoated samples with the exception of the initial “heating” period (400-600°C).
141
Authors: Lena Ryde, Joacim Hagström, W. Bevis Hutchinson
Abstract: Work has been carried out at KIMAB to determine the best, industrially feasible, conditions for producing TRIP steel sheet with the aim of obtaining a tensile strength of 600 MPa and a ductility of 30% through a hot-dip galvanising process schedule. Two of the most promising steels were selected to study the microstructures and to follow the transformation from ferrite to austenite in more detail, as well as to examine the stability of the austenite during deformation. This investigation has been performed mainly with the aid of the EBSD technique.
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Authors: David P. Field, Tracy W. Nelson, David J. Dingley
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Authors: Hai Bo Xie, Zheng Yi Jiang, Yan Bing Du, Dong Bin Wei, A. Kiet Tieu
Abstract: Surface roughness plays an important role in determining the tribological behaviour of mechanical components (e.g. gears and roller bearings etc.) under full-film and mixed (or partial) elastohydrodynamic lubrication conditions. This paper describes a detailed mechanics analysis of the surface roughness transformation of thin strip which has been cold rolled on an experimental mill. Low carbon steel strips were rolled at various speeds and reductions, and the effects of rolling parameters on surface roughness are studied. The results of surface roughness can provide important information to optimise the rolling schedule and to improve the rolled strip quality.
544
Authors: Ane Martínez-de-Guereñu, M. Oyarzabal, F. Arizti, Isabel Gutiérrez
Abstract: The recovery and recrystallization kinetics of a cold rolled interstitial free (IF) steel were studied during isothermal annealing. Magnetic methods based on coercive field measurements, hardness tests and metallography were applied so as to follow the kinetics experimentally. The coercive field measurement technique reveals a higher degree of resolution for monitoring recovery than conventional hardness determination and also allows the recrystallization progress to be monitored. The results obtained are compared to those previously determined for a non-stabilized extra low carbon (ELC) steel. The observed differences are discussed in terms of the presence of microalloying elements, Ti and Nb, which slow down recovery and delay recrystallization.
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