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| Numerical simulation of vacuum horizontal continuous casting process for superalloy bar |
| LUO He-li，FENG Di，LI Shang-ping，CAO Xu，WANG Jian-tao |
| （High-Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081,China） |
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Abstract Based on the continuum model, a coupled mathematical model is developed to study the fluid flow, heat transfer and solidification behaviors in the vacuum horizontal continuous casting (VHCC) for the Ni-based superalloy (K418 and GH4169). The developed model includes the effect of the fluid flow on the solidification and the influence of the intermittent casting cycle (i.e. pulling-pause-pulling) in VHCC on the melt flow and temperature distribution. Using the verified model, the transient melt flow and solidification in the pulling-pause-pulling casting cycle is analyzed and the effects of the varying superalloy, casting speed and the cooling intensity on the solidification process are discussed. The results show that the flow and solidification behavior are periodical due to the intermittent casting cycle in VHCC，which affects the growth of the initial solidifying shell. Under the given computation conditions, the GH4169 has a lower surface temperature and quicker solidified shell growth compared with the K418. The higher casting speed and lower cooling intensity will increase the surface temperature and extend the liquid core length of the cast bar. The present model numerically re-presents the solidification process at the intermittent casting cycle in VHCC and can be useful for improving the production process, optimizing the casting cycle and reducing the quality defects in VHCC process for the superalloy bar.
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Received: 05 December 2014
Published: 13 April 2015
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2015, Vol. 34 
