Change in Earing of Low-carbon Aluminum-killed Steel Sheets with Hot- and Cold-rolling Conditions.

The cold rolling effect on the hydrogen permeability (TH value) and on the microstructure have been studied on samples prepared from Al-killed low carbon steel sheets after several cold rolling levels. The TH values of the hot rolled strips were very short, but due to the cold rolling increase exponentially. The fragmentation of large cementite phase has a significant influence on the evolution of texture during the cold rolling process. The cold deformation effects on the TH value were studied on four annealed enamelling grade steel sheets also. Depending on the carbides sizes and carbides position in ferrite grains after annealing the TH values increase or decrease after low deformation degrees, due to the steel texture modification and dislocation character. Dislocations act as major tripping site for hydrogen, if deformation degree is higher than 30%.

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Influence of Cold Rolling Reduction and Grain Refinement of Hot Bands on Planer Anisotropy of r-Value of Cold Rolled Extra Low Carbon Steel Sheets

Tetsu-to-Hagane ◽

10.2355/tetsutohagane1955.82.10_870 ◽

1996 ◽

Vol 82 (10) ◽

pp. 870-875 ◽

Cited By ~ 4

Author(s):

Takehide SENUMA ◽

Masaharu KAMEDA

Keyword(s):

Carbon Steel ◽

Cold Rolling ◽

Grain Refinement ◽

Low Carbon Steel ◽

Rolling Reduction ◽

Low Carbon ◽

Steel Sheets ◽

Cold Rolling Reduction ◽

Cold Rolled ◽

R Value

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Hydrogen in the Plastic Deformed Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.537-538.33 ◽

2007 ◽

Vol 537-538 ◽

pp. 33-40 ◽

Cited By ~ 4

Author(s):

Enikö Réka Fábián ◽

László Dévényi

Keyword(s):

Cold Rolling ◽

Room Temperature ◽

Hydrogen Diffusion ◽

Hydrogen Permeation ◽

Cold Work ◽

Low Carbon ◽

Steel Sheets ◽

Metallic Inclusions ◽

Dissolved Hydrogen ◽

Grade Steel

The solubility of hydrogen in iron and steels are affected by temperature and crystal structure. At lower temperatures (below about 400°C), the excess hydrogen, beyond that which is soluble (and therefore dissolved) interstitially, is retained in the steel in other sites commonly referred to as ”traps”. At room temperature, the dissolved hydrogen may be only a small fraction of the total hydrogen content. The movement of hydrogen in steel occurs by the migration of atoms through the lattice. The hydrogen diffusion takes place with interstitial mechanism. Trapping enhances the solubility of hydrogen but decreases the diffusivity. In practice hydrogen transmissibility is characterized by TH value. We have studied the effect of the cold rolling on the TH value for Al-killed low carbon enamelling-grade steel sheets. The microstructures of the samples were formed from ferrite, carbides and some non-metallic inclusions. Reducing the thickness of the steel sheets by cold rolling in carbides appears ruptures, microcavities, and the dislocation density increases in ferrite grains. Cold work increases the hydrogen permeation time. The average of TH values after hot rolling was 0.6; after about 72 % thickness reductions by cold rolling the average TH values was 101.4.

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Cold Rolling Effect on Microstructure and Mechanical Properties of Low Carbon Al-Killed Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.812.315 ◽

2015 ◽

Vol 812 ◽

pp. 315-320

Author(s):

Enikö Réka Fábián ◽

Áron Kótai

Keyword(s):

Mechanical Properties ◽

Cold Rolling ◽

Low Carbon Steel ◽

Optical Microscope ◽

Low Carbon ◽

Coiling Temperature ◽

Steel Sheets ◽

Hot Rolled ◽

Ebsd Method ◽

Scanning Electron

It have been studied the cold rolling effects on the microstructure of samples prepared from Al-killed low carbon steel sheets with high coiling temperatures. The microstructure of the hot rolled steels sheet is formed from ferrite and large carbides when the coiling temperature is high. The cold rolling affects the steel mechanical and electrochemical properties due to microstructural changes. We have studied the microstructure by optical microscope and scanning electron microscope. Low angles grain boundaries and the texture of samples were studied by EBSD method.

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