On the Prediction of Grain Refinement Mechanism in Direct Chill Casting of Aluminum and Its Alloys Under Low Degree Mechanical Forced Convection

2021 ◽  
Author(s):  
Deepak Patel ◽  
Prasenjit Biswas ◽  
Anil Kumar ◽  
Hiren R. Kotadia ◽  
Archana Mallik ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Forced Convection ◽  
Direct Chill ◽  
Direct Chill Casting ◽  
Chill Casting ◽  
Low Degree ◽  
Refinement Mechanism

In-house design of forced convection direct chill casting simulator for casting immiscible Al-Sn alloys

2021 ◽  
pp. 1-8
Author(s):  
Deepak Patel ◽  
Amrik Kundu ◽  
Arjun Kundu ◽  
Prasenjit Biswas ◽  
Hiren R. Kotadia ◽  
...  
Keyword(s):  
Forced Convection ◽  
Direct Chill ◽  
Direct Chill Casting ◽  
Chill Casting ◽  
House Design

Effect of Solidification Grain Refinement on the Development of Wrought Mg Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 1729-1734 ◽  
Author(s):  
Mark Easton ◽  
Chris H.J. Davies ◽  
Matthew R. Barnett ◽  
Franka Pravdic
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Direct Chill ◽  
Mg Alloys ◽  
Direct Chill Casting ◽  
Recent Trial ◽  
Cooling Rates ◽  
Chill Casting ◽  
Grain Sizes ◽  
Operating Window

A recent trial investigated the effect of solidification grain refinement of billet on the grain refinement and properties of alloy ZM20. It was found that even at levels of 0.4Mn, significant grain refinement could be obtained when 0.7Zr was added. At 0.2Mn grain sizes as low as 60μm were obtained. Billets of Mg-2Zn-0.2Mn with four different grain sizes, due to different Zr and cooling rates were then cast via vertical direct chill casting and extruded conventionally. Benefits of grain refinement of the billet on extrusion were found to be a slight increase in the size of the operating window, and a reduction of the grain size in the extrudate. However, the effect of the reduction in extrudate grain size due to refinement of the billet was small compared with the amount of grain refinement obtained due to recrystallisation on extrusion.

scholarly journals Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 708
Author(s):  
Li Zhou ◽  
Yajun Luo ◽  
Zhenlin Zhang ◽  
Min He ◽  
Yinao Xu ◽  
...  
Keyword(s):  
Mold Wall ◽  
Direct Chill ◽  
Element Distribution ◽  
Direct Chill Casting ◽  
Electromagnetic Stirring ◽  
Alloying Elements ◽  
Alloying Element ◽  
Casting Method ◽  
Chill Casting ◽  
Cu Alloy

In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of the billets were investigated and compared with those of the normal direct chill casting method. The results show that the microstructures were refined and the homogeneity of the alloying elements distribution was greatly improved by imposing the annular electromagnetic stirring and intercooling. In uniform direct chill casting, explosive nucleation can be triggered, originating from the mold wall and dendrite fragments for grain refinement. The effects of electromagnetic stirring on macrosegregation are discussed with consideration of the centrifugal force that drives the movement of melt from the central part towards the upper-periphery part, which could suppress the macrosegregation of alloying elements. The refined grain can reduce the permeability of the melt in the mushy zone that can restrain macrosegregation.

Effect of process parameters on structure and macrosegregation upon direct chill casting of Mg–Nd–Zn–Zr alloy

2011 ◽  
Vol 27 (1) ◽  
pp. 275-281 ◽  
Author(s):  
X. W. Zheng ◽  
J. Dong ◽  
N. Zhou ◽  
P. H. Fu ◽  
S. S. Yao ◽  
...  
Keyword(s):  
Process Parameters ◽  
Direct Chill ◽  
Direct Chill Casting ◽  
Chill Casting ◽  
Zr Alloy
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