scholarly journals Microstructure and Texture of a Warmed Rolled IF Steel

2000 ◽  
Vol 34 (4) ◽  
pp. 243-253
Author(s):  
C. S. da Costa Viana ◽  
J. R. G. Matheus ◽  
A. M. Lopes ◽  
H. H. Aly El-Sharawy
Keyword(s):  
Cold Rolling ◽  
Plastic Anisotropy ◽  
Warm Rolling ◽  
Rolled Strip ◽  
If Steel ◽  
Steel Rolling ◽  
Orientation Image Microscopy ◽  
Back Scattering ◽  
Hot And Cold Rolling ◽  
Hot Rolled

Steel rolling within the temperature range intermediate between hot and cold rolling represents today a very economical and technically viable operation. The present work investigates the microstructure and the texture developed in a Ti microalloyed IF steel by rolling at 400°C and 600°C. Reductions of 40% and 60% were applied to a set of as hot rolled strip specimens part of which was subsequently annealed at 800°C for 5 minutes. Both the microstructure and the texture were examined by scanning electron microscopy. The texture was analysed by Electron Back Scattering Diffraction (EBSD) and Orientation Image Microscopy (OIM), and represented via the ODF method. The plastic anisotropy was also characterised. It was found that the textures developed by warm rolling are similar to those obtained by cold rolling, the intensities being also of comparable value. The microstructure is characterised by the presence of many shear banded grains whose amount was also quantified.

Texture, Microstructure and Second-Phase Particles in a Ti+P Interstitial Free (IF) Steel

2005 ◽  
Vol 495-497 ◽  
pp. 423-428 ◽  
Author(s):  
Q.W. Jiang ◽  
E.B. Zhao ◽  
J.G. Zhang ◽  
Y. Chen ◽  
Gang Wang ◽  
...  
Keyword(s):  
Cold Rolling ◽  
High Strength ◽  
Strain Ratio ◽  
Warm Rolling ◽  
Second Phase ◽  
Rolled Sheet ◽  
Interstitial Free ◽  
If Steel ◽  
Plastic Strain Ratio ◽  
Second Phase Particles

The microstructure of Ti+P IF steel were studied after warm rolling, cold rolling and recrystallization using X-Ray, TEM and SEM. The results show that the characteristics of warm rolled sheet are the same as that of the cold rolled, but the texture displays different characteristics in the subsequent cold rolling and recrystallization because of the numerous second-phase particles. In this work, a Ti+P IF steel sheet with high strength and plastic strain ratio was obtained.

Analysis of Microstructure and Textures on Batch Annealed IF Steel with Different Cold Reduction Ratio

2012 ◽  
Vol 429 ◽  
pp. 105-110
Author(s):  
Min Li Wang ◽  
Zhi Wang Zheng ◽  
Gong Ting Zhang
Keyword(s):  
Cold Rolling ◽  
Strain Ratio ◽  
Reduction Ratio ◽  
Cold Reduction ◽  
If Steel ◽  
Plastic Strain Ratio ◽  
Batch Annealing ◽  
Hot Rolled ◽  
Strain Hardening Index ◽  
Tension Strength

Based on the experimental materials of hot rolled Ti+Nb-IF steels and Ti-IF steels produced in the industry, the effects of cold reduction ratios on its microstructures, mechanical properties and textures were investigated. The results show that experimental samples with different cold reduction ratios have been finished recrystallization by batch annealing at 720°C and soaking with 5h. As the cold reduction ratio increases, the grains will be refined and uniform, and the textures trends to be {111} texture. The {223}<110>, {111}, and {114}<110> textures appeared after cold rolling are inherited followed by annealing, whose intensities would be higher as the cold rolling ratio increased. And the textures will transform to the {223}<110>, {111}<110> and {114}<110> textures. With the increasing cold reduction ratio, the values of the yield strength Rp0.2 and tension strength Rm increase, but the Rp0.2 is almost about 100MPa. However, the strain hardening index n90 gradually decreases. The plastic strain ratio r90 which reaches the maximum with cold reduction ratio of 70% increases firstly and then decreases. Thus, the optimal cold reduction ratio of 70% to 80% is determined, which can obtain good deep drawing performances.

Martensite Formation and Recrystallization Behavior in 17Mn0.06C2Si3Al1Ni TRIP/TWIP Steel after Hot and Cold Rolling

2013 ◽  
Vol 753 ◽  
pp. 185-190 ◽  
Author(s):  
Sara Silva Ferreira de Dafé ◽  
Débora Rezende Moreira ◽  
Mariana de Souza Matoso ◽  
Berenice Mendonça Gonzalez ◽  
Dagoberto Brandão Santos
Keyword(s):  
Cold Rolling ◽  
Electron Backscatter Diffraction ◽  
Total Elongation ◽  
Strain Induced Martensite ◽  
Work Hardening Rate ◽  
Rolled Condition ◽  
Hot And Cold Rolling ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Backscatter Diffraction

This work evaluates the evolution of the microstructure and its influence on the mechanical behavior of steel containing 17% Mn, 0.06% C, 2% Si, 3% Al, and 1% Ni after hot rolling at 1070°C, cold rolling with 44% reduction, and annealing at 700°C for different time periods. The resultant athermal, strain-induced martensite and austenite grains were analyzed by optical and scanning electron microscopy (SEM). The volume fractions of the g, e, and α’ phases of martensite were confirmed by X-ray diffraction, dilatometry, and SEM-electron backscatter diffraction (EBSD) techniques. It was found that cold reduction results in the formation of more a’ martensite. The Vickers microhardness values were higher for the cold-rolled condition and lower for recrystallized samples, as expected. However, this reduction is counterbalanced by the formation of athermal e and a’ martensite during the cooling process. The sizes of the recrystallized grains change exponentially during their growth and remain within 1–3 mm. The yield and tensile strength of the hot-rolled steel reach values close to 250 and 800 MPa, respectively, with a total elongation of 40%, which demonstrates the high work-hardening rate of the steel.

scholarly journals Study of innovation technology possibilities of steel hot-rolled tempered strip production

2019 ◽  
Vol 75 (2) ◽  
pp. 214-221
Author(s):  
E. M. Golubchik ◽  
E. M. Medvedeva ◽  
V. E. Telegin
Keyword(s):  
Cold Rolling ◽  
Surface Defects ◽  
New Technology ◽  
Rolled Strip ◽  
Cyclic Loads ◽  
Thick Steel ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Cold Stamping ◽  
Strip Production

Hot-rolled strip having normalized level of mechanical properties, produced with high accuracy as well as having decreased level of surface defects is considered often as an alternative to a cold-rolled product. An area of its utilization includes, in particular, production of automobile parts by cold stamping and blanking operations. Analysis of experience of mastering of hotrolled pickled strip technology instead of cold-rolled one as a marketable product revealed a series of problems related to provision of normalized level of surface roughness and obtained values of geometric parameters accuracy. Results of complex study represented, carried out by scientists of MGTU after G.I. Nosov together with PAO MMK within the period of mastering of new technology of hot-rolled pickled tempered strip production. Within the study a new technological flow-chart was elaborated for 3.1 mm thick steel hot-rolled pickled strip of steel 07ГБЮ production, excluding the stage of cold rolling. An operation of tempering was envisaged as a finished one, w enabled to increase resistance of hot-rolled pickled strip against cyclic loads. It was determined, that after tempering the coarseness uniformity increases along the whole surface and coil length of pickled strip. The carried out complex studies enabled to elaborate the technological effect, applied to hot-rolled products at the stage of finishing without cold rolling operation, that enables to have the level of properties in the hot-rolled pickled tempered strip, correspondent to existing world standards for such a product.

Evolution of Texture in a Ti-IF Steel during Warm Rolling and Cold Rolling

2007 ◽  
pp. 3472-3477
Author(s):  
Yan Hui Guo ◽  
Zhao Dong Wang ◽  
Guo Dong Wang ◽  
Xiang Hua Liu
Keyword(s):  
Cold Rolling ◽  
Warm Rolling ◽  
If Steel

Evolution of Texture in a Ti-IF Steel during Warm Rolling and Cold Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 3472-3477
Author(s):  
Yan Hui Guo ◽  
Zhao Dong Wang ◽  
Guo Dong Wang ◽  
Xiang Hua Liu
Keyword(s):  
Cold Rolling ◽  
Warm Rolling ◽  
If Steel

The Microstructure and Texture of Fine Grain High-Strength IF Steel after Continuous Annealing

2011 ◽  
Vol 148-149 ◽  
pp. 1419-1424
Author(s):  
Li Wen Zhang ◽  
Zhen Ming Wang ◽  
Hong Mei Zhang ◽  
Jue Hou
Keyword(s):  
Cold Rolling ◽  
Annealing Time ◽  
Recrystallization Texture ◽  
High Strength ◽  
Holding Time ◽  
Continuous Annealing ◽  
If Steel ◽  
Fine Grain ◽  
Back Scattering ◽  
High Strength If Steel

In this paper,the fine grain high-strength IF steel after cold-rolling and continuous annealing was studied.The microstructure under different holding time of fine-grain high strength IF steel was observed by the OM and the TEM technology. The influence of texture on continuous annealing time was analysed by Electron Back-Scattering Diffraction (EBSD) technology. It is proposed that the {111} recrystallization texture of fine-grain high strength IF steel is enhanced firstly, and then is weakened along with the increase of holding time, which confirms the strongest {111} texture is occurred at 120s holding time.

Research on the Precipitates in Warm-Rolled Ti-Bearing Interstitial-Free Steel Sheets

2006 ◽  
Vol 326-328 ◽  
pp. 1291-1294 ◽  
Author(s):  
Cai Nian Jing ◽  
Zuo Cheng Wang ◽  
Fu Tao Han ◽  
Wen Ping Zhang ◽  
Yan Hong Yi
Keyword(s):  
Texture Evolution ◽  
Steel Strip ◽  
High Strength ◽  
Warm Rolling ◽  
Interstitial Free ◽  
If Steel ◽  
Energy Dispersion Spectroscopy ◽  
Transmission Electron ◽  
Ferrite Region ◽  
Hot Rolled

Warm-rolling can save the production cost and extend the production kind of hot-rolled IF steel strip, the precipitates strongly influence the annealing process and texture evolution so as to the final mechanical properties of the production, very few studies has relate to the precipitates of IF steels warm-rolled in ferrite region. In present work, two Ti- IF steels were warm-rolled in ferrite region under different rolling parameters and the precipitates were investigated. Transmission electron microscopy (TEM) and Energy dispersion Spectroscopy (EDS) microanalysis were carried out on carbon extraction replicas, the characteristics such as morphology, type, amount and size of precipitates were analyzed. The results show that different type of precipitates were appeared in two steels, TiN, TiS, Ti4C2S2 and TiC were found in common Ti-IF steel, but in high strength Ti-IF steel, the amount of TiS, Ti4C2S2 was very few and FeTiP precipitates appeared, the type and morphology of precipitates were not affected by rolling parameters, however, the number and size of precipitates were changed. Finally, the effect of different P content on the change of precipitates was analyzed, the precipitating mechanism was also discussed.

scholarly journals Mechanical Properties and Textures of Particulatereinforced Aluminum Alloy Matrix Composite Under Hot- and Cold-Rolling Conditions

1998 ◽  
Vol 31 (1-2) ◽  
pp. 43-52 ◽  
Author(s):  
L. Q. Chen ◽  
Y. X. Lü ◽  
C. S. Lee ◽  
J. Bi ◽  
R. K. Y. Li
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Cold Rolling ◽  
Rolling Texture ◽  
Rolled Sheet ◽  
Alloy Matrix ◽  
Cold Rolled ◽  
Aluminum Alloy Matrix ◽  
Hot And Cold Rolling ◽  
Hot Rolled

A study has been made on the mechanical properties of an aluminum alloy matrix (Al–3.0wt% Cu–1.5 wt% Mg–0.4wt% Mn)composites reinforced with a volume fraction of 15% silicon carbide under hot- and cold-rolling conditions. The preferred crystallite orientation distribution functions (ODFs) of these rolled sheets were measured. The tensile test results showed that the ultimate tensile strength and plasticity of the hot-rolled composite sheet are better than those of the cold-rolled one. However, the cold-rolled sheet specimen exhibits much higher 0.2% offset yield strength than that in the case of hot rolling. The cold-rolling texture of this sheet composite is obtained from the development of hot-rolled texture only by a little rotation about the related axes. It consists of random texture and three weak components, {001}〈110〉, {110}〈112〉 and {3314}〈773〉, while the hot rolling texture of the metal-matrix composite (MMC) sheet is almost random under the rolling reduction employed. The preferred grain orientation has effect on the yield strength and no much influence on the ultimate tensile strength of the cold rolled sheet. The decrease in the ultimate tensile strength of the cold-rolled specimen is mainly attributed to the micro-damages in the microstructure produced during cold rolling.

Investigation on the control of multiphase flow behavior in a continuous casting tundish during ladle change

2020 ◽  
Vol 117 (6) ◽  
pp. 619
Author(s):  
Rui Xu ◽  
Haitao Ling ◽  
Haijun Wang ◽  
Lizhong Chang ◽  
Shengtao Qiu
Keyword(s):  
Multiphase Flow ◽  
Flow Behavior ◽  
Rolled Strip ◽  
Impact Zone ◽  
Steel Cleanliness ◽  
Carry Over ◽  
Slag Carry Over ◽  
Hot Rolled ◽  
Turbulence Inhibitor ◽  
The Impact

The transient multiphase flow behavior in a single-strand tundish during ladle change was studied using physical modeling. The water and silicon oil were employed to simulate the liquid steel and slag. The effect of the turbulence inhibitor on the slag entrainment and the steel exposure during ladle change were evaluated and discussed. The effect of the slag carry-over on the water-oil-air flow was also analyzed. For the original tundish, the top oil phase in the impact zone was continuously dragged into the tundish bath and opened during ladle change, forming an emulsification phenomenon. By decreasing the liquid velocities in the upper part of the impact zone, the turbulence inhibitor decreased considerably the amount of entrained slag and the steel exposure during ladle change, thereby eliminating the emulsification phenomenon. Furthermore, the use of the TI-2 effectively lowered the effect of the slag carry-over on the steel cleanliness by controlling the movement of slag droplets. The results from industrial trials indicated that the application of the TI-2 reduced considerably the number of linear inclusions caused by ladle change in hot-rolled strip coils.

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