| 摘要 |
1333354 Heat-treating turbine components UNITED AIRCRAFT CORP 7 Feb 1972 [10 May 1971] 5647/72 Headings C7A and C7N A wrought integral gas turbine blade-disc component is differentially solution treated in two stages in one of which the blade region only is heated to a relatively high temperature to produce a coarse-grained creep-resistant structure while in the other the whole component is heated to a lower temperature to produce in the disc a finegrained fatigue-resistant structure; preferably the local treatment may precede the general but the order may be reversed. The component is then given conventional stabilization and precipitation heat-treatments. As exemplified an alloy containing in percentage by weight C 0À03-0À09 Cr 14-16 Co 16-18 Mo 4À5-5À5 Ti 3À35-3À65 Al 3À85-4À15 B 0À02-0À03 Ni balance is treated by heating the blade region to the 1163- 1204‹C. followed by air cooling or faster, after which the whole component is held at 1107‹C. for 4 hours and preferably quenched into a salt bath at 316‹C. followed by air cooling. It is then given a stabilization treatment at 871‹C for 8 hours, cooled at not less than air cooling rate, heated to 982‹C. for 4 hours and again cooled at least as rapidly as air cooling. Finally it is precipitation hardened at 649‹C. for 24 hours and at 760‹C. for 8 hours, the two stages being separated and followed by air cooling. After local solution treatment the component may be aluminized, diffusion being brought about during subsequent treatments. In a second example an alloy containing C 0À03-0À1 Cr 18-21 Co 12-15 Mo 3À5-5 Ti 2À75-3À25 Al 1À2-1À6 Zr 0À05-0À12 B 0À003-0À07 Ni balance was heated in the blade region only to 1097À5‹C., and cooled in air or faster, followed by heating the whole component to 1024‹C. for 4 hours and cooling There follows stabilization at 843‹C. for 4 hours, cooling and precipitation hardening at 760‹C. for 16 hours and cooling. Localised heat-treatment may be effected by the ring inductor 4 of Fig.2, or the U-form type <SP>14</SP> of Fig.4. |
