Method for determining laying position of casting mold in directional solidification casting

Abstract

The invention discloses a method for determining the laying position of a casting mold in a directional solidification casting. The method includes the steps: dividing the outer wall of a high-temperature alloy casting into a convex structure area and a concave structure area; determining the mass center connecting curve of the high-temperature alloy casting; selecting a plurality of transverse sections along a direction parallel to the growth direction of high-temperature alloy casting directional crystals; analyzing heat dissipation of the selected transverse sections to obtain the average radiative angle factor of a concave portion of each transverse section, adjusting the laying position of the casting mold in a directional solidification furnace, comparing the average radiative angle factors of the concave portions of the selected transverse sections at different positions in the directional solidification furnace, and determining the optimal laying position of the casting mold in the directional solidification furnace when the average radiative angle factor of the concave portion of each selected transverse section is maximum by the aid of the position of the casting mold. By analyzing heat dissipation of the outer wall of the high-temperature alloy casting, the laying position beneficial to growth of directional crystal structures is obtained.

Description

【Technical field】 [0001] The invention belongs to the field of directional solidification manufacturing, and in particular relates to a method for determining the placement position of molds in directional solidification casting. 【Background technique】 [0002] The directional solidification casting process can make the grains of directional superalloy castings align along the direction of heat flow loss, which can basically eliminate the transverse grain boundaries perpendicular to the stress axis, thereby greatly improving the performance of superalloy castings, such as turbine blades. Mechanical properties and thermal performance. However, in the actual production process, the produced oriented superalloy castings often contain crystal defects, such as local polycrystalline castings and crystal orientation deviations; The successful manufacture of castings cannot be guaranteed without changing the control conditions. [0003] In view of the two shortcomings of direction...

AI Technical Summary

Problems solved by technology

However, in the case of ensuring that the above control parameters are within a reasonable range, there will still be two problems of crystal defects and a large dispersion rate in directionally solidified castings.

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