| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a retaining ring having high strength and a thin wall without remarkably decreasing ductility and causing large strength-anisotropy. SOLUTION: The retaining ring 5 is manufactured by the steps of firstly cold-working a cylindrical workpiece made from a nickel-based alloy of a base material; subsequently heat-treating it; secondly cold-working it; and subsequently aging it. The step of the first cold working consists of one or more times of cold drawing steps, and is carried out at a reduction rate of 70% or less. The heat treatment following the first cold working is carried out at a temperature between 900 and 950°C within 3 minutes. The step of second cold working also consists of one or more cold drawing steps, and is carried out at a reduction rate (cumulative reduction rate when consisting of a plurality of the steps) of 70% or less. The ageing treatment following the second cold working is carried out at 640°C or lower within 16 hours. COPYRIGHT: (C)2007,JPO&INPIT
|
