Influence of Precipitates on Behavior of Recrystallization and Grain Growth in Extra Low Carbon Ti-Bearing Cold-Rolled Steel Sheets

Suzuki, Takaya; Ishii, Yuki; Itami, Atsushi; Ushioda, Kohsaku; Yoshinaga, Naoki; Tezuka, Hiroyasu

doi:10.4028/www.scientific.net/msf.204-206.673

Cited by 10 publications

(6 citation statements)

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“…It has been widely accepted that TiS is predominantly formed at temperatures higher than Ti 4 C 2 S 2 . [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][68][69][70][71][72][73][74] In addition, (d) solubility products of TiS and Ti 4 C 2 S 2 in austenite region have been proposed by many groups. 31,35,37,44,52,53,62,68) It has often been stated that sulfide precipitation in austenite phase can be fully described through thermodynamical calculation, but all the calculations are not always consistent with each other.…”

Section: Purpose Of Our Studies and Reviews Of Past Reportsmentioning

confidence: 99%

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

Ishiguro¹,

Murayama²,

Fujita³

et al. 2009

Mater. Trans.

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The authors previously reported that even a trace level of copper (0.01% Cu) acts as a sulfide-former to form copper sulfide (Cu-S) in nonTi-added steel in which Mn has been thought to be the only sulfide-former so far. A new concept of copper-related sulfide precipitation is now extended to Ti-added steel. In addition, the total sulfide precipitation in Ti-added steel is reconfigured with the new knowledge of Cu-S. The new concept is shown in three consecutive papers. This first paper focuses on the sulfide precipitation in austenite-heat-treated Ti-added steel.Through TEM observation and quantitative chemical analysis, it is reported that the sulfide precipitation in austenite-heat-treated Ti-added steel reflects not only the precipitation in the austenite region but also the inevitable precipitation behavior during the cooling process from austenite to ferrite region, especially trace-level-Cu-induced Cu-S precipitation in ferrite region during rapid cooling. The mechanism of the inevitable sulfide precipitation during the cooling process is mainly based upon TiS-decomposition-induced morphological change and the reprecipitation of sulfur which remains solute over precipitatable limit during the heat-treatment in austenite region, and is precisely discussed in relation with Cu-S precipitation. Purpose of Our Studies and Reviews of Past ReportsThrough three consecutive papers, 1,2) the authors demonstrate the comprehensive concepts of sulfide precipitation in Ti-added steel in austenite and ferrite regions with the addition of a new concept of copper sulfide (Cu-S) precipitation induced by a small amount of 0.01%Cu, as well as the rarely-mentioned concept that Ti 4 C 2 S 2 and MnS are formed in ferrite region. The first paper focuses on sulfide precipitation in austenite region, including the phenomena in austenite-heat-treated Ti-added steel with the subsequent various cooling pattern.The following review provides explanations and comments on past studies of Cu-related precipitation, together with our purposes. These items are mentioned only in this paper, the first part of three consecutive papers. Therefore, the following description includes phenomena in both austenite and ferrite regions, because these phenomena are related to each other and cannot be completely separated. Table 1 shows the overviews of past studies on both Curelated precipitation in steel and sulfide precipitation in steel, together with the purpose of the three consecutive studies. Each item below is referred to as a ''parenthetic No.'' in Table 1. First of all, it has been believed as an established theory that (1) a small amount of Cu in non-Ti-added steel exists as solid solution, and many people have not paid any attentions to it. However, as our group has already pointed out, (2) such a trace level of Cu acts as a sulfide-former to form copper sulfide (Cu-S) in non-Ti-added steel whose sulfide-former is only Mn (more precisely, 0.01%Cu). [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The first purpose is (#1) to...

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Section: Purpose Of Our Studies and Reviews Of Past Reportsmentioning

confidence: 99%

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

Ishiguro¹,

Murayama²,

Fujita³

et al. 2009

Mater. Trans.

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“…For Ti-stabilised IF steels there is reason to believe that second phase particles have little influence at this stage. 29) • Nitrogen and sulphur in the steel are considered to combine with titanium as TiN and TiS. These particles are typically quite coarse and their influence on the microstructure development is ignored except to the extent that they consume some of the available titanium.…”

Section: Underlying Assumptionsmentioning

confidence: 99%

Advances in Physical Metallurgy and Processing of Steels. Mechanisms and Modelling of Microstructure/Texture Evolution in Interstitial-free Steel Sheets.

Hutchinson

Artymowicz

2001

ISIJ International

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Evidence relating to mechanisms of recrystallisation and associated texture evolution in low carbon steels is briefly reviewed and some new observations are presented. These viewpoints are taken as the starting point for development of a computer model that can be used to predict the effects of steel chemistry and process parameters on the grain structures and textures of titanium-stabilised interstitial-free steel sheets. The model utilises physical principles as far as possible and combines these with empirical descriptions where necessary, fitting these with the aid of experimental data. Assumptions made in the model are clearly described.

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“…Where =6x10 -7 J/mm 2 is the grain boundary energy , V m =7x10 3 mm 3 /mol is the molar volume [23], f and r are the volume fraction and the radius of the precipitate, respectively. Given that TiC particles have a radius of 10nm and TiN particles have a radius of 25nm, the precipitate volume fraction, (f) is calculated using equation ( kg/m 3 is the density of the ferrite [4].…”

Section: Recrystallisation Of Ulc Steelsmentioning

confidence: 99%

Precipitation in vanadium bearing ultralow carbon strip steels

Ooi¹,

Fourlaris²,

Tanner³

et al. 2006

Materials Science and Technology

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Two novel Ultra Low Carbon steels were investigated, one based on combined vanadium and titanium additions and the second based on titanium only additions. Grain size and mechanical property measurements have been performed on continuous annealed samples previously subjected to 80% cold rolling reduction on both strip steel grades. The recrystallisation and grain coarsening characteristics of annealed ULC strips have been studied. The amount of precipitated species, under equilibrium conditions, at various annealing temperatures has also been calculated using MT-DATA thermodynamic modelling software. TEM characterisation coupled with EDX study of the precipitation sequences on continuous annealing strips was also performed. Precipitate studies of the novel ULC steels confirmed the major role of TiC precipitates in retarding the recrystallisation behaviour of ULC strip steels. The role of vanadium addition in ULC steel grades in reducing the recrystallisation temperature of ULC strip steels was also identified.

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Influence of Precipitates on Behavior of Recrystallization and Grain Growth in Extra Low Carbon Ti-Bearing Cold-Rolled Steel Sheets

Cited by 10 publications

References 0 publications

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

Advances in Physical Metallurgy and Processing of Steels. Mechanisms and Modelling of Microstructure/Texture Evolution in Interstitial-free Steel Sheets.

Precipitation in vanadium bearing ultralow carbon strip steels

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Influence of Precipitates on Behavior of Recrystallization and Grain Growth in Extra Low Carbon Ti-Bearing Cold-Rolled Steel Sheets

Cited by 10 publications

References 0 publications

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) &mdash;Precipitation in Austenite Region&mdash;

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) &mdash;Precipitation in Austenite Region&mdash;

Advances in Physical Metallurgy and Processing of Steels. Mechanisms and Modelling of Microstructure/Texture Evolution in Interstitial-free Steel Sheets.

Precipitation in vanadium bearing ultralow carbon strip steels

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Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—