公开(公告)号：US20170320132A1

公开(公告)日：2017-11-09

申请号：US15477769

申请日：2017-04-03

Applicant: ROLLS-ROYCE PLC

Inventor： Martin R. PERRY ,  Kevin GOODWIN ,  Neil DSOUZA

IPC: B22D27/04 ,  B22D27/20 ,  B22C9/22 ,  B22C9/08 ,  B22C9/00

CPC classification number: B22D27/045 ,  B22C9/00 ,  B22C9/04 ,  B22C9/082 ,  B22C9/22 ,  B22D27/20 ,  C30B11/002 ,  C30B29/52 ,  F05D2230/21

Abstract: A mould for casting a component in a directional solidification casting process having a preferred direction of grain growth (non-axial ) comprises a shell defining a cavity for receiving molten material. The cavity defines a three dimensional shape made up of a finished component geometry portion (42, 43, 44) and a sacrificial geometry portion (45) wherein the sacrificial geometry portion (45) includes a notch (48) which is shaped and positioned so as to, in use, contain high angle grain boundaries between dendritic growth in the preferred direction (non-axial ) and dendritic growth in a competing direction to the preferred direction (axial ) within the sacrificial geometry portion of a casting solidifying in the mould.