Abstract
In the development of a high-efficiency grain selector, the spiral selectors are widely used in Ni-based single crystal (SX) superalloys casting to produce single crystal turbine blades. For the complex three-dimensional structure of the spiral, a 2D grain selector was designed to investigate in this paper. As a result, the parameters of two-dimensional grain selection bond and the corresponding grain selection mechanism were established, and the three-dimensional grain selection bond was designed again by means of two-dimensional coupling optimization parameters.
Highlights
Single-crystal (SX) superalloys are widely applied to make industry gas turbines for its high temperature performance with a Fe–Ni or Fe–Co matrix
To obtain a single-crystal structure, grain selectors are applied in practice
Grain 1 was growing at a faster rate than Grain 2 and Grain 3, so the further growth of Grain 2 and Grain 3 would be limited by the vertical dendrites of Grain 1
Summary
Single-crystal (SX) superalloys are widely applied to make industry gas turbines for its high temperature performance with a Fe–Ni or Fe–Co matrix. In order to improve the temperature bearing capacity and high temperature mechanical properties of turbine blades, Ni-based superalloys are considerably researched. Ni-based single-crystal (SX) superalloys such as Mar M247L, CMSX-6, and CMSX-4 are used to make the blades due to the excellent high temperature performance. In comparison with equiaxed (EQ) and directional solidified (DS), SX is choosing due to the better performance of the. To obtain a single-crystal structure, grain selectors are applied in practice. The structure of a selector is mainly composed of two parts: The starting block and grain selector
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