EBSD Study of Substructure and Texture Formation in Dual-Phase Steel Sheets for Semi-Finished Products

2010 ◽  
Vol 160 ◽  
pp. 251-256 ◽  
Author(s):  
M. Masimov ◽  
N. Peranio ◽  
B. Springub ◽  
Franz Roters ◽  
Dierk Raabe
Keyword(s):  
Cold Rolling ◽  
Annealing Temperature ◽  
Texture Evolution ◽  
Industrial Process ◽  
Dual Phase ◽  
Technological Parameters ◽  
Dual Phase Steels ◽  
Final Annealing ◽  
Steel Sheets ◽  
Different Temperatures

Using SEM/EBSD the substructure and texture evolution in dual phase steels in the first steps of the process chain, i.e. hot rolling, cold rolling, and following annealing were characterized. In order to obtain dual phase steels with high ductility and high tensile strength an industrial process was reproduced by cold rolling of industrially hot rolled steel sheets of a thickness of 3.75 mm with ferrite and pearlite morphology down to a thickness of 1.75 mm and finally annealing at different temperatures. Such technique allows a compilation of ferrite and martensite morphology typical for dual phase steels. Due to the competition between recovery, recrystallization and phase trans-formation during annealing a variety of ferrite martensite morphologies was produced by promoting one of the mechanisms through the variation of technological parameters such as heating rate, intercritical annealing temperature, annealing time, cooling rate and the final annealing temperature. Annealing induced changes of the mechanical properties were determined by hardness measurements and are discussed on the basis of the results of the substructure investigations.

The Texture Evolution of Dual Phase Steel Sheets

2007 ◽  
Vol 26-28 ◽  
pp. 51-54
Author(s):  
Yan Dong Liu ◽  
Q.W. Jiang ◽  
He Tong ◽  
Yan Dong Wang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Recrystallization Texture ◽  
Dual Phase Steel ◽  
Single Phase ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Dual Phase ◽  
Steel Sheets ◽  
Cold Rolling Texture ◽  
Martensite Microstructure

in this paper, the texture evolution of cold rolling and recrystallization of dual phase steel sheets is studied. The experimental results show that the cold rolling texture components are γ fiber (<111>//N.D.) and α fiber (<110>//R.D.). After heat treatment (austenizing temperatures 960°C and 980°C, 0.7°C/S cooling to 650°C, a rational holding time to form ferrite and martensite microstructure), the texture components are still γ fiber and α fiber, the recrystallization texture in dual phase steel sheet is remarkable different compared to the recrystallization texture in the pure (single phase??) ferrite.

Research of the Continuous Annealing Process to Eliminate the "Band" Feature of Dual Phase Steels

2016 ◽  
Vol 867 ◽  
pp. 45-49
Author(s):  
Ji Lin Chen ◽  
Guo Hui Zhu ◽  
Jian Zhang ◽  
Yong Gang Liu ◽  
Hong Bo Pan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Annealing Temperature ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Steel Sheets ◽  
Scanning Electron

A new continuous annealing process which can eliminate the "band" feature of dual phase steels has been designed. The sheets were annealed in MULTIPAS annealing simulator under variation of annealing temperature. The microstructure evolution of dual-phase steel sheets annealed at intercritical temperatures, were analyzed by optical microscopy and scanning electron microscopy. And the properties were compared with the sheets which annealed by the existing annealing process. The results show that: the "band" feature of dual-phase steel can be effectively eliminated by the optimizing continuous annealing process,and the mechanical properties are improved.

Texture Evolution during Cold Rolling and Annealing in Dual Phase Steels

2011 ◽  
Vol 702-703 ◽  
pp. 778-781 ◽  
Author(s):  
Jai Gautam ◽  
Alexis G. Miroux ◽  
Jaap Moerman ◽  
Carla Barbatti ◽  
Leo Kestens
Keyword(s):  
Phase Transformation ◽  
Cold Rolling ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Recovery Process ◽  
Second Phase ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Initial Stage ◽  
Cold Rolling And Annealing

This paper investigates the bulk texture evolution during cold rolling and annealing of Dual Phase steels for different processing conditions, i.e. cold reduction within the reduction range of 45 to 73% and annealing at temperatures between 650 and 850°C, which includes the recovery, recrystallisation and partial phase transformation domains. Textures have been measured by X-ray diffraction. The results reveal that the rolling texture is strengthened during the recovery process or initial stage of recrystallisation while during recrystallisation a weak RD-ND type of texture appears. During subsequent phase transformation the RD-ND type of texture further weakens and later randomises as the second phase fraction increases beyond 75%.

scholarly journals Effects of α+γ Intercritical and γ Single-Phase Annealing on Martensitic Texture Evolution in Dual-Phase Steel Sheets

2018 ◽  
Vol 58 (6) ◽  
pp. 1136-1145
Author(s):  
Hidekazu Minami ◽  
Kaneharu Okuda ◽  
Shinjiro Kaneko ◽  
Yasunobu Nagataki
Keyword(s):  
Dual Phase Steel ◽  
Single Phase ◽  
Texture Evolution ◽  
Dual Phase ◽  
Steel Sheets

Texture Evolution in Non-Oriented Silicon Steel Processed by Twin-Roll Casting

2012 ◽  
Vol 452-453 ◽  
pp. 7-11 ◽  
Author(s):  
Wei Pei ◽  
Yu Hui Sha ◽  
Fang Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Texture Evolution ◽  
Casting Process ◽  
Rolling Process ◽  
Silicon Steel ◽  
Recrystallization Annealing ◽  
Twin Roll Casting ◽  
Steel Sheets ◽  
Roll Casting ◽  
Twin Roll

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

scholarly journals Effect of Shear Bands Induced by Asymmetric Rolling on Microstructure and Texture Evolution of Non-Oriented 3.3% Si Steel

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4696
Author(s):  
Zhiyong Fang ◽  
Yanhui Guo ◽  
Bin Fu ◽  
Liqun Wei ◽  
Jun Chen ◽  
...  
Keyword(s):  
Surface Layer ◽  
Thermal Energy ◽  
Annealing Temperature ◽  
Texture Evolution ◽  
Shear Bands ◽  
Subsequent Annealing ◽  
Asymmetric Rolling ◽  
Nucleation Sites ◽  
Different Temperatures ◽  
Complete Recrystallization

In the present work, the microstructure and texture of non-oriented 3.3% Si steel processed by asymmetric rolling (ASR) and subsequent annealing at different temperatures were compared with those obtained when using traditional symmetric rolling (SR). This work aims to reveal the effect of shear bands introduced by the ASR on the microstructure and texture evolution. The ASR sample reaches a recrystallization fraction of 62% at an annealing temperature of 650 °C, which is 32% higher than that of the SR sample annealed at the same temperature. This can be attributed to the abundant shear bands introduced by the ASR, which serve as the heterogeneous nucleation sites for the recrystallized grains. When increasing the annealing temperature to 750 °C, complete recrystallization could be observed in both asymmetric- and symmetric-rolled samples. When using an annealing temperature of 650 °C, the γ-oriented grains were dominant in the surface layer, while strong Goss-oriented grains could be observed in the center in the ASR sample. This is due to the fragmented small subgrains with different orientations in the surface layer inhibiting the nucleation of Goss- and cube-oriented grains during the annealing. In contrast, numerous Goss- and cube-oriented grains were formed in the surface layer after complete recrystallization when the ASR sample was annealed at a temperature of 750 °C. This may be related to the higher thermal energy, which benefits the nucleation of the Goss- and cube-oriented grains. In addition, ASR significantly increased the strength of η-fiber after complete recrystallization when compared with SR. This work might be helpful to design the rolling and the subsequent annealing processes.

Facilitated Recrystalization of the Hard-to-Recrystalize Structure in 16% Cr Steel Sheets by one-Pass ECAP Prior to Cold Rolling

2011 ◽  
Vol 702-703 ◽  
pp. 607-610
Author(s):  
Hiroyuki Miyamoto ◽  
Tong Xiao ◽  
Toshiyuki Uenoya
Keyword(s):  
Cold Rolling ◽  
Strain Path ◽  
Equivalent Strain ◽  
Recrystallization Temperature ◽  
Deformation Bands ◽  
Final Annealing ◽  
Steel Sheets ◽  
Novel Approach ◽  
Cold Rolled ◽  
Strain Path Change

The extended band structures of cold-rolled high Cr steel sheets are recrystallization resistant, and tend to become the so-called grain colony as a recovered state. It is shown that a novel approach involving strain-path change by introducing one-pass ECAP prior to cold rolling facilitated recrystallization. Indeed, recrystallization temperature was reduced by 100 °C, compared with cold rolling alone imposing the same equivalent strain. Dense deformation bands introduced during ECAP perturbed the banded structures and enhanced the recrystallization at final annealing.

Microstructure and Texture of Cold Rolled and Recrystallized CrNoNi Medium-Entropy Alloy

2018 ◽  
Vol 941 ◽  
pp. 833-838
Author(s):  
Gunasekaran Dan Sathiaraj ◽  
Werner Skrotzki ◽  
R. Jose Immanuel ◽  
Aurimas Pukenas ◽  
Rolf Schaarschuch ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Volume Fraction ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Alloy Plate ◽  
Texture Intensity ◽  
Different Temperatures ◽  
Average Size

An equiatomic CrCoNi medium-entropy alloy plate was heavily deformed by conventional cold rolling and subsequently annealed at different temperatures. Microstructure and texture evolution of the deformed and annealed sheets were investigated by electron backscatter diffraction and X-ray diffraction. Heavy cold rolling induces an alloy type α-fibre texture with major brass component. This type of texture is indicative of low stacking fault energy of the CrCoNi alloy. Annealing at 700 °C leads to a homogeneously recrystallized microstructure with ultrafine grains of about 800 nm average size. The volume fraction of different texture components is almost similar after annealing at different temperatures. However, the overall texture intensity after annealing is very weak. Finally, in order to understand the microstructure and texture evolution of the CrCoNi alloy, it is critically compared with other low stacking fault energy FCC materials.

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