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A comment on Rolls-Royce’s single-crystal turbine blade casting foundry. Parent comment

Re:Rolls-Royce’s single-crystal turbine blade casting foundry by Cerium on Sunday September 11, 2016 @03:22PM (#12475106)
A helix functions as a grain selector. I think that only the crystal with axial alignment is fastest in general at propagating through a spiral.

Animation of the effect: https://www.youtube.com/watch?v=br9iaeYYxSM

Paper on the development of single crystal casting: http://www.tms.org/superalloys/10.7449/2008/Superalloys_2008...

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