α→γ→α Transformation Texture Formation at Cold-Rolled Ultra Low Carbon Steel Surfaces

2005 ◽  
Vol 495-497 ◽  
pp. 1267-1272 ◽  
Author(s):  
Naoki Yoshinaga ◽  
Leo Kestens ◽  
Bruno C. De Cooman
Keyword(s):  
Carbon Steel ◽  
Surface Texture ◽  
Alternative Hypothesis ◽  
Sheet Steel ◽  
Low Carbon Steel ◽  
Rolled Sheet ◽  
Texture Formation ◽  
Low Carbon ◽  
Ultra Low Carbon Steel ◽  
Cold Rolled

The influence of Mn on the surface texture formation through a®g®a transformation was investigated. After the a®g®a transformation, a weak texture was formed at the surface of ultra low carbon cold-rolled sheet steel without Mn. In contrast, a sharp <100>//ND cube texture was observed in Mn alloyed ultra low carbon steel. In order to interpret the effect of Mn two alternative mechanisms were considered : (i) one assumption attributes the occurrence of the specific surface texture to the effect of outer-surface energy (ii) and according to an alternative hypothesis the release of elastic work parallel to ND in the surface area is responsible for the observed <100>//ND surface texture.

Surface Texture Evolution during α-γ-α Transformation in Mn and Al Alloyed Ultra-Low Carbon Steel

2007 ◽  
Vol 550 ◽  
pp. 503-508 ◽  
Author(s):  
Jai Gautam ◽  
Roumen H. Petrov ◽  
Leo Kestens
Keyword(s):  
Carbon Steel ◽  
Surface Texture ◽  
Surface Effect ◽  
Alternative Hypothesis ◽  
Texture Evolution ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Metal Vapour ◽  
Ultra Low Carbon Steel ◽  
Cold Rolled

This paper investigates the surface texture evolution during α−γ−α phase transformation. After austenite annealing of the cold rolled sheets a weak texture was formed at the surface of ultra low carbon steel alloyed with Mn and Al. This texture consists of <100>//ND and <110>//ND fiber orientations with an intensity of approximately 2 X random. This surface texture is confined to a mono-layer of surface grains which are in direct contact with the metal/vapour interface. In order to interpret this surface effect, two alternative mechanisms were considered: (i) one assumption attributes the occurrence of the specific surface texture to the minimization of the outer surface energy and (ii) according to an alternative hypothesis the release of elastic work parallel to ND in the surface area is responsible for the observed surface fibers. After analyzing the experimental data it is concluded that the evidence in support of hypothesis (i) is the more convincing in this experiment.

The Effect of Heating Rate on the Recrystallization Behavior in Cold Rolled Ultra Low Carbon Steel

2016 ◽  
Vol 88 (1) ◽  
pp. 1600351 ◽  
Author(s):  
Felipe Manuel Castro Cerda ◽  
Florian Vercruysse ◽  
Tuan Nguyen Minh ◽  
Leo Kestens ◽  
Alberto Monsalve ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Heating Rate ◽  
Low Carbon Steel ◽  
Recrystallization Behavior ◽  
Low Carbon ◽  
Ultra Low Carbon Steel ◽  
Cold Rolled

Surface Microstructure Evolution during Phase Transformation on Mn, Al and Si Alloyed Ultra Low Carbon Steel

2010 ◽  
Vol 297-301 ◽  
pp. 757-763
Author(s):  
Jai Gautam ◽  
Roumen H. Petrov ◽  
Elke Leunis ◽  
Leo Kestens
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Surface Texture ◽  
Texture Evolution ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Metal Vapour ◽  
Industrial Composition ◽  
Steel Sheets ◽  
Ultra Low Carbon Steel

This paper investigates the surface texture evolution after a short phase transformation annealing in low vacuum on ultra low carbon steel sheets alloyed with high Mn and Al and the cold rolled steel sheets of industrial composition alloyed with silicon. The ultra low carbon steel sheets with high Mn and Al show surface monolayer which has a characteristic surface texture components <100>//ND texture and microstructure with special grain morphology. Contrastingly, the industrial composition alloyed with silicon does not show specific surface texture components inspired by surface energy anisotropy at the surface. The composition depth profiling investigations performed on the all steel sheet surface shows that oxidation characteristics of alloying elements at the metal vapour interface have played a decisive influence on surface texture evolution. Further, transformation annealing in higher vacuum reveals that surface texture can be obtained in an industrial composition alloyed with silicon.

Effect of Cold Reduction Rate on Ferrite Recrystallization Behavior during Annealing in Low-Carbon Steel with Different Initial Microstructures

2021 ◽  
Vol 1016 ◽  
pp. 1045-1050
Author(s):  
Toshio Ogawa ◽  
Ryo Hishikawa ◽  
Yoshitaka Adachi
Keyword(s):  
Carbon Steel ◽  
Reduction Rate ◽  
Low Carbon Steel ◽  
Cold Reduction ◽  
Rolled Sheet ◽  
Recrystallization Behavior ◽  
Low Carbon ◽  
Dislocation Densities ◽  
Cold Rolled ◽  
Hot Rolled

We investigate the effect of the cold reduction rate on ferrite recrystallization behavior during the annealing of low-carbon steel with different initial microstructures. Three types of hot-rolled sheet specimens are prepared: specimens P, B, and M, which consist of ferrite and pearlite, bainite, and martensite, respectively. To evaluate the effect of the cold reduction rate on ferrite recrystallization behavior, hot-rolled sheet specimens are cold-rolled at cold reduction rates of 40% and 67%. The cold-rolled sheet specimens are heated to the target temperature, and then water-quenched to room temperature. Irrespective of the initial microstructures, the ferrite recrystallization is accelerated by increasing the cold reduction rate. In addition, the dislocation densities of specimens P and B increase at the larger cold reduction rate, which accelerates ferrite recrystallization in these specimens. In the case of specimen M, the dislocation arrangement parameter remarkably decreases at the larger cold reduction rate, whereas the dislocation density hardly changes. Thus, we conclude that the accelerated ferrite recrystallization at the larger cold reduction rate for specimen M can be mainly attributed to an increase in the amount of interactions between dislocations in the specimen.

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