Deformability of Eutectic Al-Si Alloys Produced by Semi-Continuously DC Casting during Hot-Rolling

2012 ◽  
Vol 706-709 ◽  
pp. 436-440 ◽  
Author(s):  
Tao Hong ◽  
Gang Zhao ◽  
Ni Tian ◽  
Fu Xiao Yu ◽  
Liang Zuo
Keyword(s):  
Compression Ratio ◽  
Hot Rolling ◽  
Direct Chill ◽  
Single Pass ◽  
Eutectic Si ◽  
Dc Casting ◽  
Hot Rolled ◽  
Rolling Deformation ◽  
Hot Plasticity

The deformability and the microstructures of Al-12.2Si-0.6Mg alloy during hot-rolling were investigated by means of rolling the specimens of wedge bars with length of 180mm and width of 30mm, which had front thickness of 5mm and back thickness of 44mm.The wedge bars were cut from the ingots of the Al-12.2Si-0.6Mg alloy by the semi-continuously direct chill (DC in short) casting. The specimens of wedge bars were hot-rolled following holding between 410°Cand 480°C for different time. The results show that the size, morphology, distribution characters of eutectic Si particles in the Al-12.2Si-0.6Mg alloy can be remarkably modified by semi-continuously DC casting, which consists of coarse ribbon-like Si-particles with less than 5μm in length and 1μm in width and quite a lot eutectic phases of less than 0.4μm in size and space. The results also show that the ingots of the Al-12.2Si-0.6Mg alloy by the semi-continuously DC casting can possess excellent deformability during hot-rolling if the extent of heating is provided over 440°C for 60min and 410°C for 120min, and they cannot emerge cracked edges with the compression ratio of 85% by single-pass rolling. Their hot-plasticity depends on the size and space between eutectic phases in the ingots. Hot-rolling deformation makes ribbon-like Si phases in them crack and spheroidize, and then results in the sizes of coarse Si particles tending to be consistent.

Microstructural Evolution of Eutectic Al-Si Alloys Produced by Semi-Continuously DC Casting during Heating and Hot-Rolling

2010 ◽  
Vol 146-147 ◽  
pp. 1289-1292
Author(s):  
Tao Hong ◽  
Gang Zhao ◽  
Ni Tian ◽  
Fu Xiao Yu ◽  
Liang Zuo
Keyword(s):  
Uniform Distribution ◽  
Microstructural Evolution ◽  
Compression Ratio ◽  
Hot Rolling ◽  
Direct Chill ◽  
Optical Microstructure ◽  
Eutectic Si ◽  
Dc Casting ◽  
Size And Morphology ◽  
Hot Plasticity

Semi-continuously direct chill (DC in short) casting was carried out to modify the size and morphology of eutectic Si particles in eutectic Al-Si alloy. Successively, the size, morphology, distribution characters of eutectic Si particles and the hot plasticity ability of the alloy during heating and hot-rolling were investigated by the observation of optical microstructure characterization and the rolling of wedge bar. The results show that the eutectics in the eutectic Al-Si alloy can be remarkably fined by semi-continuously DC cast. The eutectic Si phase particles will coarsen and spheroidize after holding at 480°C for 2h, which enables eutectic Al-Si alloy to possess excellent hot plasticity free of cracked edge with compression ratio of rolling up to 85% by single pass. Though little difference on the size of spheroidized Si particles during hot rolling can be observed, uniform distribution of the Si particles can be obtained by hot rolling with compression ratio of 85%.

Texture Evolution during Hot Rolling Deformation in Al-5wt%Mg Alloy

2007 ◽  
Vol 345-346 ◽  
pp. 89-92
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
Jong Kweon Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Surface Region ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Strip Cast ◽  
Hot Rolled ◽  
Backscatter Diffraction ◽  
Rolling Deformation

Evolution of crystallographic texture by hot rolling deformation at the temperature of 200°C was investigated by hot rolling tests on as-cast Al-5wt%Mg alloy fabricated by a new strip cast technology. Texture variation through the thickness direction in the Al-5wt%Mg alloy was examined experimentally. Macrotexture and microtexture measurements were conducted using X-ray diffractometer and electron backscatter diffraction (EBSD), respectively. Experimental investigation reveals that the evolution of texture and microstructure is strongly dependent on a distance from center of the Al-5wt%Mg alloy sheet. It was found that the shear texture components tend to be increased at the surface region of the hot-rolled specimen.

Experiment on Hot Rolling Deformation Resistance of Aluminum Alloy and Mathematical Modeling

2011 ◽  
Vol 314-316 ◽  
pp. 409-414
Author(s):  
Chang Sheng Wang ◽  
Hai Xiong Wang ◽  
Ji Bin Li ◽  
Jiang Zhang
Keyword(s):  
Aluminum Alloy ◽  
Mathematical Models ◽  
Hot Rolling ◽  
Resistance Coefficient ◽  
Deformation Resistance ◽  
Alloy Plate ◽  
Rolled Aluminum ◽  
Hot Rolled ◽  
The Impact ◽  
Rolling Deformation

In order to investigate the impact factor of hot rolled aluminum alloy, a experiment was finished in a factory, to determine the effects of hot-rolled aluminum alloy plate with the system deformation resistance coefficient of the various factors and to mark the influence about the temperature to the hot rolling deformation resistance; Then, established the mathematical models of 1100,3003,5052 series hot rolled aluminum alloy plate's deformation resistance; The data calculated by the theoretical mathematical models is in good agreement the measured data. So this mathematical have the importance actual significance to actual production.

Grain Characteristics of 1235 Aluminum Alloy during Rolling

2020 ◽  
Vol 846 ◽  
pp. 77-81
Author(s):  
Wen Duan Yan ◽  
Gao Sheng Fu ◽  
Xiu Min Zhou ◽  
Dong Dong Chen
Keyword(s):  
Aluminum Alloy ◽  
Hot Rolling ◽  
Lattice Distortion ◽  
High Angle Boundary ◽  
Recrystallization Annealing ◽  
High Angle ◽  
Coarse Grains ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Rolling Deformation

Grain characteristics of rolled 1235 aluminum alloy were studied by EBSD. The effects of hot rolling, cold rolling and rolling deformation on grain boundaries and grain size of the metal were studied as well. The content of high-angle boundaries was low by 16.48 % in 50 % hot-rolled 1235 aluminum alloy. The complete dynamic recrystallization occurred, and grains were coarse. During 90 % hot rolling, the low-angle boundaries turned into high-angle boundaries constantly. The content of high-angle boundaries was higher by 40.16 %. Coarse grains broke into fine grains, and grew into medium grains. In the 90 % cold-rolled alloy, the trace shape of high-angle boundary was irregular. The lattice distortion was large, providing the energy needed in recrystallization during recrystallization annealing.

A Roll Caster to Cast Clad Strip

2013 ◽  
Vol 554-557 ◽  
pp. 1902-1909 ◽  
Author(s):  
Toshio Haga ◽  
Hiroshi Tsuge ◽  
Shinji Kumai ◽  
Hisaki Watari
Keyword(s):  
Melting Point ◽  
Hot Rolling ◽  
Direct Chill ◽  
Al Alloys ◽  
Mg Alloy ◽  
Lower Melting ◽  
Lower Melting Point ◽  
Dc Casting ◽  
Twin Roll Caster ◽  
Twin Roll

A tandem-type roll caster that can cast a three-layered clad strip was developed by mounting one twin roll caster on another twin roll caster. In this caster, the base strip is cast by the upper twin roll caster, and the overlay strips are cast by the lower caster. The three strips are metallurgically bonded by the lower caster. This study investigated three aspects of this caster. First, the clad ratio could be controlled by the solidification lengths of strips from the upper and lower twin roll casters, and a clad ratio of 1:8:1 was attained. Second, although it is known that fabrication of clad strips from Al-Mg alloy and other Al alloys is very difficult, the clad strip with the Al-Mg alloy as the base strip or the overlay strip could be cast. Finally, by adding scrapers, the caster could cast the clad strip with a base strip having a lower melting point than the overlay strip. Element strips of the clad strip are made by many processes, such as direct chill (DC) casting, scraping of the ingot surface, heat treatment, hot rolling, and cold rolling. Typically, surface treatment and hot rolling are used to clad the strips. Since many processes are required, clad strips require consume much energy. Therefore, producing clad strips is expensive. A vertical-type tandem twin roll caster was developed to cast clad strips. This caster has the advantages of process saving and energy saving, and so can fabricate economical clad strips. In the fabrication of clad strips, control of the clad ratio is very important. In the brazing sheet for automobile radiators, the base strip is made from AA3003 and the overlay strips are made from AA4045, and the clad ratio is usually 1:8:1. In the present study, a clad strip with a clad ratio of 1:8:1 was attained. The cladding by hot rolling of Al-Mg and other aluminum alloys, which is considered to be a very difficult process, was also investigated. Clad strips with either a base strip or an overlay strip of an Al-Mg alloy were cast by the roll caster. Although the cladding was not easy, the Al-Mg alloy could be cast into the clad strip. In addition, a clad strip with a base strip having a lower melting point than that of the overlay strip was investigated. Such cladding cannot be cast by the vertical-type tandem twin roll caster as mentioned above because the base strip is re-melted from the heat of the overlay strips. In the present study, a scraper was developed and adopted to cast a clad strip with a base having a lower melting point than that of the overlay strips. This type of clad strip could be cast because the scrapers prevented the re-melting of the base strip. In this paper, these three aspects of fabrication are reported.

Simulation of Texture Evolution during Hot Rolling Deformation in FCC Materials

2007 ◽  
Vol 345-346 ◽  
pp. 869-872 ◽  
Author(s):  
Shi Hoon Choi ◽  
Y.S. Song ◽  
B.J. Kim ◽  
Hyoung Wook Kim ◽  
Suk Bong Kang
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Fe Analysis ◽  
Self Consistent ◽  
Octahedral Slip ◽  
Fcc Materials ◽  
Hot Rolled ◽  
Rolling Deformation ◽  
Deformation Gradients

The evolution of hot rolling texture in FCC materials has been simulated numerically using a visco-plastic self-consistent (VPSC) polycrystal model. A finite element (FE) analysis with ABAQUS/StandardTM was conducted to evaluate the deformation gradients during hot rolling deformation. In order to capture crystallographic rotation during hot rolling deformation, an octahedral slip system was considered in a microscopic hardening model. The FE analysis with the VPSC polycrystal simulations successfully predicted the inhomogeneous texture development through the thickness direction in the hot-rolled Al-5wt%Mg alloy sheets.

Ferrite Grain Coarsening from Hot Rolled Austenite in ODS Steels

2013 ◽  
Vol 753 ◽  
pp. 514-517
Author(s):  
Xiao Chao Wu ◽  
Shigeharu Ukai ◽  
Ryota Miyata ◽  
Yoshito Sugino ◽  
Naoko Oono ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Formation Process ◽  
Air Cooling ◽  
Grain Coarsening ◽  
Ferrite Formation ◽  
Temperature Range ◽  
Ods Steels ◽  
Hot Rolled ◽  
Nucleation Growth

The hot rolling at temperature range of 1100 °C to 862 °C and subsequent air-cooling induce a formation of the coarse ferrite grains in the 9CrODS steels. This coarse ferrite is produced by transformation from the severely hot rolled γ-grains to ferrite. Formation process and mechanism of the transformed coarse ferrite are interpreted in terms of a nucleation, growth and coalescence of the same variant ferrite grains under a variant restriction rule.

Effects of Casting Conditions on End Product Defects in Direct Chill Casted Hot Rolling Ingots

2016 ◽  
pp. 185-193 ◽  
Author(s):  
Arda Yorulmaz ◽  
Çağlar Yüksel ◽  
Eraz Erzi ◽  
Derya Dispinar
Keyword(s):  
Hot Rolling ◽  
Direct Chill

scholarly journals Determination of system connections of hot rolled steel sheet manufacturing process

2019 ◽  
Vol 298 ◽  
pp. 00142
Author(s):  
Elena Shiriaeva ◽  
Marina Polyakova
Keyword(s):  
Technological Process ◽  
Hot Rolling ◽  
Steel Sheet ◽  
System Analysis ◽  
Rolling Process ◽  
Metal Sheet ◽  
Technical System ◽  
Analysis Application ◽  
Material Energy ◽  
Hot Rolled

System analysis is used to state links between input and output parameters of any technical system taking into consideration flows of material, energy, and information. This approach makes it possible to find effective ways for improvement of technical system parameters. The paper presents results of system analysis application for multioperational technological process steel sheet of hot rolling. Structural scheme of metal sheet hot rolling process is presented based on principles of system analysis. Hot rolling technological operations such as workpiece heating, hot rolling, cooling, and coiling are presented as subsystems. Due to the obtained schemes metal sheet parameters are stated which have to be controlled during each technological operation of hot rolling technological process. The obtained results can be used as the basics for mathematical modeling of steel sheet hot rolling operation in order to get the final product with the required set of properties.

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