scholarly journals Study on Development of Novel Mg-Based Alloys by Rapid Solidification Technology of Twin Roll Casting

2019 ◽  
Vol 804 ◽  
pp. 23-27
Author(s):  
Hai Jian Wang ◽  
Zhi Pu Pei ◽  
Dong Ying Ju
Keyword(s):  
Electron Microscope ◽  
Rapid Solidification ◽  
Amorphous Phase ◽  
Solidification Process ◽  
Element Distribution ◽  
High Concentration ◽  
Cooperative Research ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

In this study, Mg-based alloys were prepared by rapid solidification of twin roll casting (TRC), then microstructure and element distribution were investigated respectively with Scanning Electron Microscope (SEM) and Electron Probe Micro Analyzer (EPMA). What’s more, in order to analyze microstructure and crystal structure of Mg-based alloys, experiments on specimens with the usage of X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) were also carried out. At last, the designed Mg-Re magnesium alloy with quasi-amorphous phase plus fine crystalline phase dual phase microstructure produced with our rapid solidification of TRC process. The rapid solidification process realized with a faster casting speed and a thinner roll gap that does not need any anther additional devices and vacuum environment. EPMA results and TEM analyses show that the quasi-amorphous phase has a high concentration in Al and RE element. There are quasi-amorphous phase in the middle of Mg-Re alloy cross section surrounded by dendrites phase and normal crystals. Acknowledgement. This work was supported by Cooperative Research and Development Center for Advanced Materials (CRDAM) funded by the Institute for Materials Research (IMR), Tohoku University (Project Number 18G0042).

scholarly journals Simulation of Solidified Microstructure and Experimental Comparative Study of Twin-Roll Casting Aluminum Alloys

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Teng Ma ◽  
Junting Zhang ◽  
Xiaochao Cui ◽  
Xiaosi Sun
Keyword(s):  
Aluminum Alloys ◽  
Solidification Process ◽  
Tensile Tests ◽  
Metallographic Examination ◽  
Twin Roll Casting ◽  
Dendrite Arm Spacing ◽  
Roll Casting ◽  
Cellular Automaton Method ◽  
Casting Aluminum ◽  
Twin Roll

A coupled macro-micro mathematical model of twin-roll casting was established in the study. The continuous solidification process of Al-10Mg aluminum alloys in front of the nip point was numerically simulated by the cellular automaton method and the solidification microstructure, dendritic grain radius, and secondary dendrite arm spacing were obtained through simulation to predict the mechanical property of wedge strips. In order to verify the reliability of the simulation results, the metallographic examination and tensile tests were performed with the as-cast specimens. The results showed that the gain size, the distribution characteristics of various grain regions, dendrite arm spacing, and the yield strengths obtained from simulation were consistent with experimental results.

Study on Rapid Solidification of Metal Strips

2013 ◽  
Vol 838-841 ◽  
pp. 69-75
Author(s):  
Cheng Zhou ◽  
De Wang ◽  
Deng Chao Luo ◽  
Yong Fang ◽  
Shun Yao ◽  
...  
Keyword(s):  
Rapid Solidification ◽  
Thickness Distribution ◽  
Flow Distribution ◽  
Casting Process ◽  
Pure Lead ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Uniform Flow Distribution ◽  
Commercial Purity Aluminum ◽  
Twin Roll

Aim to produce metal strips in millimeter scale, the Top Side-pouring Single Roll Casting process and the Top Side-pouring Twin Roll Casting process were investigated in this paper, using commercially pure lead and commercial-purity aluminum as the experimental materials. Numerical simulation was conducted before the experiment. The results show that, the Top Side-pouring Single Roll Casting process and the Top Side-pouring Twin Roll Casting process can both realize the uniform flow distribution and rapid solidification, but the surface of the strips cast by the former are irregularity because of free solidification, while that from the latter present a state of rolling. And one can change the gauge of nozzle and the speed of cooling roll, to regulate the thickness of thin strips, and by changing the shape of the nozzle, the thickness distribution can be handled.

Thermal Mechanical Behaviors and Microstructure Characteristics in Twin-Roll-Casting Process of Magnesium Alloy AZ31

2009 ◽  
Vol 614 ◽  
pp. 143-148 ◽  
Author(s):  
Xiao Dong Hu ◽  
Hong Yang Zhao ◽  
Dong Ying Ju
Keyword(s):  
Solidification Process ◽  
Casting Process ◽  
Surface Cracks ◽  
Fem Model ◽  
Alloy Az31 ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Microstructure Morphology ◽  
Rolling Deformation ◽  
Twin Roll

Twin-Roll-Casting process is a rapid solidification process combining with hot rolling deformation. The liquid metal will be squeezed out but not sucked in from the mush zone caused by rolling deformation. This is different from conventional continuous casting process and will greatly affect the microstructure morphology and surface cracks of as-cast strip. In this paper, a 2D FEM model was employed to simulate the thermal mechanical behavior during twin-roll casting process of Mg alloy AZ31. The FEM results were compared with experimental results and show the effect of rolling deformation on the microstructure morphology and surface cracks of as-cast sheet.

scholarly journals Corrosion Behavior and Mechanical Properties of Mg-Based Alloys by Rapid Solidification Technology of Twin Roll Casting

2019 ◽  
Vol 804 ◽  
pp. 53-57
Author(s):  
Hai Jian Wang ◽  
Zhi Pu Pei ◽  
Dong Ying Ju
Keyword(s):  
Mechanical Properties ◽  
Rapid Solidification ◽  
Corrosion Behavior ◽  
Crystalline Phase ◽  
Az31 Alloy ◽  
Dual Phase ◽  
Alloy Strip ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

Mg-based alloys were prepared by rapid solidification of twin roll casting (TRC) which shows that the Mg-RE alloy expressed the quasi-amorphous phased and fine crystalline phase dual-phase material. Corrosion behavior of Mg-Based alloy in 3.5% NaCl solution after 48h immersion and mechanical properties were investigated. The result show that The Mg-RE alloy strip exhibited good corrosion resistance and higher ultimate tensile strength and elongation comparing to the AZ31 alloy strips. The elongation of Mg-RE alloy strip is also high than the AZ91 and ZK61 under powder metallurgy processing. These indicate that Mg-RE alloy produced by our method has a better ductility. This may due to the special microstructure of the Mg-RE alloy forms, i.e., quasi-amorphous phase plus fine crystalline phase dual phase state.

scholarly journals Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 952
Author(s):  
Shiju Li ◽  
Bowen Wei ◽  
Wei Yu ◽  
Chen He ◽  
Yong Li ◽  
...  
Keyword(s):  
Body Force ◽  
High Strength ◽  
Solidification Structure ◽  
Experimental Characterization ◽  
Alloy Plate ◽  
Twin Roll Casting ◽  
Comprehensive Properties ◽  
Roll Casting ◽  
Mold Casting ◽  
Twin Roll

In this work, a Al-Cu-Li alloy plate with outstanding mechanical properties was successfully prepared with electromagnetic twin-roll casting (TRC) technology. The microstructure of Al-Cu-Li alloy manufactured by conventional mold casting, TRC, and electromagnetic TRC was studied in detail. The action mechanism of electromagnetic oscillation field (EOF) in the TRC process was studied by systematic experimental characterization and numerical simulation. The results show that the EOF will enlarge the circumfluence area in the cast-rolling zone, accelerate the mass transfer and heat transfer in the molten pool, and make the solute field and flow field in the liquid cavity tend to be evenly distributed. Further, the introduction of the EOF will produce the electromagnetic body force F with the maximum strength of 14 N/m3. The F acting on the solidification front will eliminate the accumulation and deposition of Cu2+, Li+, Mg2+, Zn2+, Mn2+ at the dendrite tip and inhibit the growth of dendrites. At the same time, the F can refine the microstructure of the TRC plate, promote the formation of equiaxed crystals, improve the supersaturated solid solubility of solute elements in the a(Al) matrix, and avoid the appearance of obvious solute segregation area or the formation of excessive solute enrichment area. Therefore, the macro-segregation in TRC plate was significantly reduced, the solidification structure was dramatically refined, and the comprehensive properties of the alloy were remarkably improved.

Effect of Secondary Cooling on Non-Oriented Electrical Steel Strips Produced by Twin-Roll Casting Process

2013 ◽  
Vol 690-693 ◽  
pp. 218-221
Author(s):  
Ting Zhang ◽  
Xiao Ming Zhang ◽  
Zhi Yuan Guo ◽  
Yu Qian Wang ◽  
Cheng Gang Li
Keyword(s):  
Electrical Steel ◽  
Casting Process ◽  
Air Cooling ◽  
Secondary Cooling ◽  
Twin Roll Casting ◽  
Steel Strips ◽  
Roll Casting ◽  
Average Size ◽  
Equiaxed Grains ◽  
Twin Roll

Effect of secondary cooling on non-oriented electrical steel strips was investigated. The 2.0 mm thick cast strips contain two compositions were produced by twin-roll casting process, cooled in the air or cooled by spraying water. The microstructure was observed by optical microscopy, and EBSD was used to characterize the texture of the cast strips. The results showed that air-cooling cast strips have uniform and equiaxed grains with average size of 250 μm. The microstructure of the water-spraying cast strips compose of most equiaxed grains and a small number of abnormal big grains. At the same time, the secondary cooling rate mildly affects the cast texture strength but has no influence on the texture type.

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