Directional solidification method capable of reducing number of freckles in variable-section casting

A technology of directional solidification and cross-section change, which is applied in the direction of self-solidification, chemical instruments and methods, crystal growth, etc., can solve the problems of low cooling rate and solidification rate, freckles, etc., and achieve high cooling rate and solidification rate, less consumption, and reduced effect of tendency

Inactive Publication Date: 2016-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of freckles due to the low cooling rate and solidification rate in the directional solidification process of the existing section-changing castings, the present invention proposes a directional solidification method that can reduce the freckles in the section-changing castings

Method used

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  • Directional solidification method capable of reducing number of freckles in variable-section casting
  • Directional solidification method capable of reducing number of freckles in variable-section casting
  • Directional solidification method capable of reducing number of freckles in variable-section casting

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Embodiment 1

[0035] This embodiment is a directional solidification method capable of reducing freckles in castings with varying cross-sections.

[0036]Apply this embodiment to the directional solidification of a casting 1 simulating the section change of the hollow blade, such as figure 1 As shown; the size of the small section of the casting with the section change is 4mm×20mm×100mm, the size of the large section of the casting is 40mm×20mm×25mm, and the material is nickel-based superalloy. Specific steps are as follows:

[0037] Step 1, start to determine the cooling rate and solidification rate distribution of the casting with cross-section change during the directional solidification process.

[0038] The cooling rate and solidification rate distribution of the cross-sectional casting in the process of directional solidification are obtained by simulation calculation. Use ProCAST software to numerically simulate the directional solidification process of casting 1 according to conv...

Embodiment 2

[0053] Apply the present invention to the directional solidification of a casting 1 simulating the section change of the hollow blade, such as figure 1 As shown; the size of the small section of the casting with the section change is 4mm×20mm×100mm, the size of the large section of the casting is 40mm×20mm×50mm, and the material is a nickel-based superalloy; the specific steps are as follows:

[0054] Step 1, start to determine the cooling rate and solidification rate distribution of the casting with cross-section change during the directional solidification process.

[0055] The cooling rate and solidification rate distribution of the cross-sectional casting in the process of directional solidification are obtained by simulation calculation. Use ProCAST software to numerically simulate the directional solidification process of casting 1 according to conventional methods, and perform post-processing to obtain the cooling rate and solidification rate distribution on the castin...

Embodiment 3

[0070] Apply the present invention to the directional solidification of a casting 1 simulating the section change of the hollow blade, such as figure 1 As shown; the size of the small section of the casting with the section change is 4mm×20mm×100mm, the size of the large section of the casting is 40mm×20mm×50mm, and the material is a nickel-based superalloy; the specific steps are as follows:

[0071] Step 1, start to determine the cooling rate and solidification rate distribution of the casting with cross-section change during the directional solidification process.

[0072] The cooling rate and solidification rate distribution of the cross-sectional casting in the process of directional solidification are obtained by simulation calculation. Use ProCAST software to numerically simulate the directional solidification process of casting 1 according to conventional methods, and perform post-processing to obtain the cooling rate and solidification rate distribution on the castin...

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Abstract

The invention discloses a directional solidification method capable of reducing the number of freckles in a variable-section casting. By adding a radiation baffle on the top of a formwork of the variable-section casting, cooling rate or solidification rate is increased, so that freckles are removed. By means of the radiation baffle, radiant heat of a heating body on the upper portion is blocked, heat absorbed by liquid phase is reduced, so that casting cooling rate is increased, dendritic structure can be refined, thermosolutal convection flow resistance is increased, solidification rate is increased, and the possibility that dendritic growth rate is larger than interdendritic flow rate is increased. By the adoption of the method, cooling rate and solidification rate can be increased during casting solidification, and the possibility of freckle formation is reduced. Specific implementation is easy, material sources are wide, consumption is low, and the original formwork does not need to be changed.

Description

technical field [0001] The invention belongs to the field of directional solidification of nickel-based superalloys, in particular to a directional solidification method capable of reducing freckles in castings with cross-section changes. Background technique [0002] Because the size and quality of gas turbine blades are much larger than those of aeroengine blades. Therefore, the commonly used high-speed solidification method (HRS method) directional solidification technology that eliminates transverse grain boundaries and obtains directional grains or single crystals increases the probability of casting defects such as freckles due to insufficient cooling capacity and other reasons. Freckle defect is a chain-like macro-segregation composed of shrinkage porosity, eutectic, broken dendrite arms, etc., usually appearing on the surface of directional solidified castings, which reduces the high-temperature deformation resistance of castings. [0003] At present, it is generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04C30B11/00C30B29/52
CPCB22D27/045C30B11/00C30B29/52
Inventor 李秋东沈军秦岭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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