Paper Title:
Numerical Simulation of Unidirectional Solidification Process of Turbine Blade Castings
  Abstract

A mathematical model for three-dimensional simulation of unidirectional solidification process and microstructure evolution of Ni-based superalloy investment castings was developed based on CA-FD method. The modified ray tracing method was used to solve the complicated heat radiation transfer among the multiple blades and outer space during withdrawal process. Various withdrawal rates were used. During one process high withdrawal rate was used first before the platform approached the baffle. Then the low withdrawal rate was used to reduce the temperature difference of the platform in horizontal section and avoid the defects formed in the corner of the platform. The experimental cooling curves of different positions in the blades and microstructure were compared with the simulation results. Both the results showed that the various withdrawal rates process was effective to reduce the temperature difference of the platform and avoid the formation of stray grains. This process could be helpful to increase the productivity.

  Info
Periodical
Advanced Materials Research (Volumes 26-28)
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
947-952
DOI
10.4028/www.scientific.net/AMR.26-28.947
Citation
J. Yu, Q. Y. Xu, B. C. Liu, J. R. Li, H. L. Yuan, "Numerical Simulation of Unidirectional Solidification Process of Turbine Blade Castings", Advanced Materials Research, Vols. 26-28, pp. 947-952, 2007
Online since
October 2007
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Price
$35.00
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