COMPUTED TEMPERATURE PROFILES OF HOT ROLLED PLATE AND STRIP DURING ACCELERATED COOLING

Usual static recrystallization treatment and a method to provide intense plastic deformation, ARB namely Accumulative Roll-Bonding, have been applied to two beta type titanium alloys, i.e. Ti-29Nb-13Ta-4.6Zr and Ti-15V-3Cr-3Sn-3Al. Microstructural change as well as work-hardening behavior was examined as a function of plastic strain. Both the work-hardening rate and the hardness at the initial as-hot-rolled state were smaller in the Ti-Nb-Ta-Zr alloy than in the Ti-V-Cr-Sn-Al alloy. Recrystallized grains of 14μm in size were obtained by the usual static recrystallization treatment, which was significantly smaller than that of the starting as-hot-rolled plate of 38μm. No significant change other than flattening and elongating of the original grains was found in the optical microscopic scale. It was revealed, however, from a TEM observation combined with selected area diffraction technique that geometric dynamic recrystallization occurred in the Ti-Nb-Ta-Zr alloy deformed at room temperature by a true strain of 5, resulting in an ultra-fine-grained microstructure where the grain size was roughly estimated to be about 100nm.

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Correlation among Microstructure, Texture, and Properties along the Thickness Direction in As-Hot-Rolled and As-Solution-Quenched Al7055 Thick Plates

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1026.65 ◽

2021 ◽

Vol 1026 ◽

pp. 65-73

Author(s):

Kai Zhu ◽

Hong Wei Yan

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Tensile Tests ◽

Rolled Plate ◽

Uniaxial Tensile ◽

Thickness Direction ◽

Electron Backscattered Diffraction ◽

Thick Plates ◽

Aluminum Plates ◽

Hot Rolled

Both microstructure inhomogeneity and mechanical property diversity along the thickness direction in rolled thick aluminum plates have been considered to have a remarkable impact on the performance and properties of the products made from the plates. In this study, scanning electron microscopy (SEM) and electron backscattered diﬀraction (EBSD) characterizations of microstructure and texture types along the thickness directions of Al7055 thick plate specimens prepared using two conditions, hot-rolling and solution-quenching, were performed. To examine the mechanical properties, uniaxial tensile tests were also carried out on specimens machined from both types of thick plates, using a layered strategy along the thickness direction. The results indicate that both the microstructure and mechanical properties are inhomogeneous under the two conditions. Furthermore, it is evident that there is a hereditary relationship between the mechanical properties of the two plates—areas with higher yield strength in the as-hot-rolled plate correspond to areas with the higher yield strength in the as-solution-quenched plate

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Application of Quenching-Partitioning-Tempering Process in Hot Rolled Plate Fabrication

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.82 ◽

2010 ◽

Vol 654-656 ◽

pp. 82-85 ◽

Cited By ~ 3

Author(s):

Shu Zhou ◽

Ying Wang ◽

Nai Lu Chen ◽

Yong Hua Rong ◽

Jian Feng Gu

Keyword(s):

Mechanical Properties ◽

Retained Austenite ◽

High Strength Steels ◽

High Strength ◽

Significant Fraction ◽

Rolled Plate ◽

Quenching And Partitioning ◽

Good Ductility ◽

Hot Rolled ◽

Rolled Plates

The quenching-partitioning-tempering (Q-P-T) process, based on the quenching and partitioning (Q&P) treatment, has been proposed for producing high strength steels containing significant fraction of film-like retained austenite and controlled amount of fine martensite laths. In this study, a set of Q-P-T processes for C-Mn-Si-Ni-Nb hot rolled plates are designed and realized. The steels with Q-P-T processes present a combination of high strength and relatively good ductility. The origin of such mechanical properties is revealed by microstructure characterization.

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Hot Deformation Behavior of Al-Cu-Li-Mg-Zn-Zr-Sc Alloy in As-Cast and Hot-Rolled Condition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.920.244 ◽

2018 ◽

Vol 920 ◽

pp. 244-249 ◽

Cited By ~ 1

Author(s):

Yaroslav Erisov ◽

Sergey Surudin ◽

Fedor Grechnikov

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Rheological Model ◽

Physical Simulation ◽

Constant Strain Rate ◽

Rolled Plate ◽

Hollomon Parameter ◽

Aluminum Lithium ◽

Rolled Condition ◽

Hot Rolled

The results of physical simulation of hot compression of semi-finished products, selected from a cast ingot and hot-rolled plate from aluminum-lithium alloy V-1461, in the temperature range of 400-460°C and strain rates of 1-60 s-1are presented. It is established that at a constant strain rate the flow stresses decrease with increasing test temperature, an increase in the strain rate leads to an increase in flow stresses at a constant temperature. The parameters of the hot deformation rheological model, including the Zener-Hollomon parameter and the hyperbolic sine law, are determined. It is established that the parameters of the rheological model for the cast and hot-rolled state differ insignificantly.

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A self-learning method for improving the hot-rolled plate shape

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/452/2/022024 ◽

2018 ◽

Vol 452 ◽

pp. 022024

Author(s):

Chen Zhang ◽

Ziying Liu ◽

Changli Zhang ◽

Xudong Li ◽

Qiuna Wang

Keyword(s):

Rolled Plate ◽

Learning Method ◽

Plate Shape ◽

Hot Rolled ◽

Self Learning

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Effect of rapid heating process in hot stamping on compact strip production hot rolled plate

Procedia Manufacturing ◽

10.1016/j.promfg.2018.07.387 ◽

2018 ◽

Vol 15 ◽

pp. 1055-1061

Author(s):

Bin Zhu ◽

Jia Zhu ◽

Zhoujie Zhu ◽

Yilin Wang ◽

Yisheng Zhang

Keyword(s):

Rapid Heating ◽

Hot Stamping ◽

Rolled Plate ◽

Heating Process ◽

Compact Strip Production ◽

Hot Rolled ◽

Strip Production

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Effects of Homogenization-Free on the Microstructures of an Al-Mg-Si-Cu Hot-Rolled Plate for Automotive Pannel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.941.1529 ◽

2018 ◽

Vol 941 ◽

pp. 1529-1534

Author(s):

Ni Tian ◽

Qi Long Liu ◽

Zi Yan Zhao ◽

Gang Zhao ◽

Kun Liu

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Aluminum Alloy ◽

Rolling Direction ◽

Rolled Plate ◽

Alloy Plate ◽

Solution Treated ◽

Aluminum Alloy Plate ◽

Hot Rolled ◽

Scanning Electron

The microstructure of Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy plate hot-rolled from homogenization and homogenization-free ingots were investigated by optical microscopy and scanning electron microscopy assisted with energy dispersive spectroscopy (SEM/EDS). The results showed that there are 3 main kinds of constituents such as Mg2Si, AlCuMgSi and AlFeMnSi in the as-cast Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy ingot. After homogenization treated at 545°C for 24h, the black Mg2Si and the white bright AlCuMgSi particles in the ingot dissolved into matrix, but the grey AlFeMnSi phase partly dissolved, contracted into sphere and become coarse, many ultrafine dispersoids appear in the dendritic arms. The constituents in the plates hot-rolled from the homogenization and homogenization-free ingots are both distributed as broken chains along the rolling direction. However, compared with the particles configuration in the plate that hot-rolled from homogenization ingot, the particles in the plate that hot-rolled from the homogenization-free ingot are finer, more numerous and more homogenous, and with insufficient recrystallization when the plates are solution treated at 545°C for 2 h and then water quenched.

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