Effects of ultrasonic treatment on structure of roll casting aluminum strip

2007 ◽  
Vol 14 (3) ◽  
pp. 363-369 ◽  
Author(s):  
Da-heng Mao ◽  
Yun-fang Zhang ◽  
Zhao-hui Nie ◽  
Qiao-hong Liu ◽  
Jue Zhong
Keyword(s):  
Ultrasonic Treatment ◽  
Aluminum Strip ◽  
Roll Casting ◽  
Casting Aluminum

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.

scholarly journals Optimizing the Microstructure and Mechanical Properties of Vacuum Counter-Pressure Casting ZL114A Aluminum Alloy via Ultrasonic Treatment

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4232
Author(s):  
Gang Lu ◽  
Pengpeng Huang ◽  
Qingsong Yan ◽  
Pian Xu ◽  
Fei Pan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ultrasonic Treatment ◽  
Eutectic Silicon ◽  
Primary Phase ◽  
Pressure Casting ◽  
Counter Pressure ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum

The effect of ultrasonic temperature on density, microstructure and mechanical properties of vacuum counter-pressure casting ZL114A alloy during solidification was investigated by optical microscopy (OM), scanning electron microscope (SEM) and a tensile test. The results show that compared with the traditional vacuum counter-pressure casting aluminum alloy, the primary phase and eutectic silicon of the alloy with ultrasonic treatment has been greatly refined due to the dendrites broken by ultrasonic vibration. However, the refining effect of ultrasonic treatment on vacuum counter-pressure casting aluminum alloy will be significantly affected by ultrasonic temperature. When the ultrasonic temperature increases from 680 °C to 720 °C, the primary phase is gradually refined, and the morphology of eutectic silicon also changes from coarse needle-like flakes to fine short rods. With a further increase in the ultrasonic temperature, the microstructure will coarse again. The tensile strength and elongation of vacuum counter-pressure casting ZL114A alloy increases first and then decreases with the increase of ultrasonic temperature. The optimal mechanical properties were achieved with tensile strength of 327 MPa and the elongation of 5.57% at ultrasonic temperature of 720 °C, which is 6.3% and 8.2%, respectively, higher than that of alloy without ultrasonic treatment.

Influence of Different Roll Casting Conditions on Casting Microstructure

2013 ◽  
Vol 652-654 ◽  
pp. 2432-2436
Author(s):  
Xiao Bo Liu ◽  
Wen Kang Yan
Keyword(s):  
Casting Speed ◽  
Casting Machine ◽  
Longitudinal Direction ◽  
Solidification Structure ◽  
Columnar Crystal ◽  
Aluminum Strip ◽  
Roll Casting ◽  
Columnar Grains ◽  
Columnar Grain ◽  
Equiaxed Grains

The changes of roll casting microstructure under different casting conditions on experimental casting machine was studied, which showed that solidification microstructure is different with different casting speed and thickness. When the casting speed is 1.3m/min,the thickness of strip is 6mm, coarse columnar grain dominates the solidification structure; when it continuously increases to 4m/min, the thickness of strip is 3mm, aluminum strip shows as hybrid organization with columnar grains in two sides and small equiaxed grains in the center; when the casting speed is over 12m/min,the thickness of strip is 1.75mm, columnar grains all convert into equiaxed grains in solidification structure. The deformation microstructures are different with the different casting speed and thickness of strip. When the casting speed is 0.9m/min, the thickness of strip is 6mm, typical processing flow lines come into being along longitudinal direction and transverse direction shows as squashed grains without re-crystallization. When the casting speed is 5.4m/min, the thickness of strip is 2.5mm, microstructure of aluminum strip becomes chevron organization from columnar crystal, there is a condensate in the center of aluminum strip, and the deformation of outer metal is more serious than inner, incomplete dynamic recrystallized grains come into being in the outer metal of the aluminum strip.

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