Casting mold for high-temperature alloy cast ingot with large height-diameter ratio and application

Abstract

The invention provides a casting mold for a high-temperature alloy cast ingot with the large height-diameter ratio and application. The casting mold comprises a hollow casting mold unit, an opening is formed in the upper end of the casting mold unit, the casting mold unit is sleeved with a riser unit, the riser unit is sequentially provided with a casting head layer and a heat preservation layer from inside to outside, and the casting mold unit is sequentially provided with a first section, a second section and a third section from top to bottom; and the inner walls of the first section, the second section and the third section are flush in the vertical direction, and the outer wall of the second section retracts inwards relative to the first section and the third section in the horizontal direction. The invention further provides application of the casting mold for the high-temperature alloy ingot with the large height-diameter ratio. According to the casting mold for the high-temperature alloy cast ingot with the large height-diameter ratio and the application, the shrinkage porosity in the center of a casting can be remarkably reduced, the cast ingot quality and the product yield are improved, large-scale production is easy, and no adverse effect is generated on the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy material preparation, and relates to a casting mold for high-temperature alloy ingots with a large aspect ratio and its application, in particular to a method for significantly reducing secondary shrinkage cavities in high-temperature alloy ingots with a large aspect ratio casting molds and methods of use. Background technique [0002] In the actual production process, the vacuum induction smelting process of superalloy master alloy ingots generally adopts the mold casting method, and the mold material is usually cast iron or cast steel. Cast iron and cast steel molds have high thermal conductivity, and nickel-based superalloy melts have high viscosity and poor fluidity. For slender ingots with large aspect ratios, the lateral solidification distance is much smaller than the longitudinal solidification , in the middle and later stages of molten metal casting, the columnar grains gr...

AI Technical Summary

Problems solved by technology

Cast iron and cast steel molds have high thermal conductivity, and nickel-based superalloy melts have high viscosity and poor fluidity. For slender ingots with large aspect ratios, the lateral solidification distance is much smaller than the longitudinal solidification , in the middle and later stages of molten metal casting, the columnar grains growing laterally in the ingot have been contacted and closed, causing the feeding channel of the longitudinal alloy liquid to be blocked, resulting in the formation of secondary shrinkage cavities along the center of the ingot

Secondary shrinkage cavities are hidden inside the alloy ingot, often distributed continuously or discontinuously, and cannot be completely removed

The above-mentioned method of heating the casting mold as a whole or arranging heating and cooling devices in different regions at the same time has obvious disadvantages. On the one hand, it is difficult to arrange and operate the heating and cooling devices in the vacuum smelting furnace, and the devices occupy space to reduce the number of casting molds that can be placed in the vacuum pouring chamber. Increase the production cost, and the excessively high local hot temperature will cause the change of the ingot structure and aggravate the element segregation, so it is not feasible in actual industrial production

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