| 摘要 |
1511734 Co alloy sheet produced from powder CABOT CORP 19 May 1975 [17 May 1974] 21122/75 Headings C7A and C7D Alloy sheet suitable for industrial articles with a cutting edge is made by producing atomized prealloyed powder containing:- Cr 27-32 W 3À5-5À5 C 0À9-2À4 Mo 0-1À5 Mn 0-2 Fe 0-3 Si 0-2 Mi 0-3 B 0-1 Co balance The powder at -30 mesh is packed into a steel container, evacuated and consolidated in an isostatic press at about 1150‹C (2100‹F) under a fluid pressure of about 15000 p.s.i. for about 2 hours, cooled and hot worked by rolling at about 1175‹C to sheet up to 36" wide. The resultant material has a microstructure of a solid solution matrix with a dispersion of fuel carbides, the average size of which is less than 2 microns i.e. significantly smaller than the conventionally cast and hot worked material. |
