| Popis: |
Most directionally solidified (DS) superalloy blades and vanes operating at or above 950°C in jet engines usually contain Hafnium (Hf) to improve mechanical properties and performances. The addition of Hf increases the cost of these alloys and may cause a number of problems which limit their usage. At BIAM, a Hf-free DS superalloy, DZ4, was developed in the late 1970’s. The improved mechanical properties, and good castability of this alloy, combined with low cost, make the DZ4 alloy suitable for production applications. In this paper, compositional and microstructural characterizations will be discussed. Mechanical properties, and engineering applications for the alloy will be presented. |
