公开(公告)号：EP3505277A1

公开(公告)日：2019-07-03

申请号：EP18215092.0

申请日：2018-12-21

申请人： HITACHI-GE NUCLEAR ENERGY, LTD.

发明人： HIRANO, Sei ,  KIYOTOKI, Yoshihisa ,  MIYATA, Hajime ,  KAWANAKA, Hirotsugu ,  MATSUSHITA, Shinji ,  SHIRATORI, Hiroshi

IPC分类号： B22F3/115 ,  B23P15/00 ,  C22C1/04 ,  C22F1/10 ,  F01L3/04 ,  F01L3/08 ,  F16K3/02 ,  F16K3/12 ,  F16K25/00 ,  G21C17/022 ,  B23K26/342 ,  F01L3/02 ,  C23C4/06 ,  C23C4/10 ,  C23C4/12 ,  C22C19/07 ,  C23C24/10 ,  B22F7/04

摘要： The invention is intended to improve the corrosion resistance of an overlay used in a severe environment such as a nuclear power plant, and to reduce dissolution of cobalt from an overlay. The corrosion and wear resistant overlay 7 is formed along a surface of a base 2 by using laser lamination modeling, and is configured from a plurality of metal layers 1a, 1b, 1c, and 1d of a Co-base alloy. The size (thickness) of carbide eutectics that precipitate in the metal layers la, 1b, 1c, and 1d is the largest in the metal layer 1a closest to the base 2, and is gradually smaller in the metal layers 1b, 1c, and 1d farther away from the base 2. The intensity of the laser beam applied to form layers by laser lamination modeling is appropriately adjusted so that the carbide eutectics that precipitate in at least the outermost metal layer 1d have a controlled size of 10 µm or less.