一种高性能航空涡轮盘用铸锻合金的研究进展

he advanced cast & wrought (C&W) superalloys for turbine disc applications have low temperature bearing capacity and poor processing ability compared with the powder metallurgy (PM) superalloys. Recently,a new kind of C&W Ni-Co base disc superalloys, named as TMW alloy, has been developed on the basis of an innovative concept. Full-scale pancakes (440 mm in diameter and 65 mm in thickness) with an average grain size of about 10 mm were successfully manufactured by a conventional C&W processing route. TMW alloys can provide 58~76 temperature advantages over alloy U720Li in 0.2% creep strain life under 630 MPa and are comparable with the advanced PM disc superalloys. In this work, the alloy design, preparation processing capacity, microstructural control, performance characteristics and deformation strengthening mechanisms were briefly introduced.