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

A high-temperature alloy and high-diameter ratio technology, which is applied in the field of high-temperature alloy material preparation, can solve the problems of discontinuous distribution, poor feasibility, and high melt viscosity of nickel-based superalloys, so as to improve product yield, facilitate large-scale production, The effect of improving the quality of ingots

Active Publication Date: 2021-09-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Provide a casting mold 1# for high-temperature alloy ingot with large aspect ratio, such as figure 1 As shown, the material of the mold unit is No. 45 carbon structural cast steel. The mold unit is tubular, the height-to-diameter ratio of the mold unit is 6.4, the inner diameter of the mold unit is 125mm, and the height is 800mm. The height of the first section is 160mm, accounting for 20% of the height of the mold unit; the height of the second section is 320mm, accounting for 40% of the height of the mold unit; the height of the third section is 320mm, accounting for 40% of the height of the mold unit . The wall thickness of the first section is 20mm; the wall thickness of the second section is 10mm; the thickness of the third section is 35mm; so that the wall thickness difference between the first section and the second section is 10mm, the first section The difference in wall thickness from the third section is 15mm.

[0071] The height-to-diameter ratio of the r...

Embodiment 2

[0075] Provide a casting mold 2# for high-temperature alloy ingot with large aspect ratio, such as figure 1 As shown, the material of the mold unit is stainless steel. The mold unit is tubular, the aspect ratio of the mold unit is 16, the inner diameter of the mold unit is 50mm, and the height is 800mm. The height of the first section is 320mm, accounting for 40% of the height of the mold unit; the height of the second section is 240mm, accounting for 30% of the height of the mold unit; the height of the third section is 240mm, accounting for 30% of the height of the mold unit . The wall thickness of the first section is 30mm; the wall thickness of the second section is 20mm; the thickness of the third section is 40mm; so that the wall thickness difference between the first section and the second section is 10mm, the first section The difference in wall thickness from the third section is 10mm.

[0076] The height-to-diameter ratio of the riser unit is 0.6. The material in...

Embodiment 3

[0080] Provide a casting mold 3# for high-temperature alloy ingots with a large aspect ratio, such as figure 1 As shown, the material of the mold unit is No. 45 carbon structural cast steel. The casting mold unit is tubular, the aspect ratio of the casting mold unit is 24, the inner diameter of the casting mold unit is 50mm, and the height is 1200mm. The height of the first section is 360mm, accounting for 30% of the height of the mold unit; the height of the second section is 600mm, accounting for 50% of the height of the mold unit; the height of the third section is 240mm, accounting for 20% of the height of the mold unit . The wall thickness of the first section is 25mm; the wall thickness of the second section is 20mm; the thickness of the third section is 40mm; so that the wall thickness difference between the first section and the second section is 5mm, the first section The difference in wall thickness from the third section is 15mm.

[0081] The height-to-diameter r...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/06B22D7/10
CPCB22D7/06B22D7/106B22D7/005
Inventor 祝国梁谭庆彪孙宝德疏达汪东红董安平
Owner SHANGHAI JIAO TONG UNIV
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