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Evaluation Method of Recrystallization Tendency in Precision Casting Process of Nickel-based Single Crystal Superalloy

A technology of superalloy and nickel-based single crystal, which is applied in the field of superalloy, can solve the problem of difficulty in evaluating the recrystallization tendency of single crystal superalloy, and achieve the effects of fast and accurate recrystallization tendency, low cost and easy casting.

Active Publication Date: 2020-08-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for evaluating recrystallization tendency of nickel-based single crystal superalloy precision casting process, which can solve the problem of difficult evaluation of recrystallization tendency of single crystal superalloy, and realize the recrystallization tendency evaluation of existing single crystal superalloy Evaluation of recrystallization tendency, providing basis for alloy material selection

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  • Evaluation Method of Recrystallization Tendency in Precision Casting Process of Nickel-based Single Crystal Superalloy
  • Evaluation Method of Recrystallization Tendency in Precision Casting Process of Nickel-based Single Crystal Superalloy

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Embodiment 1

[0035] In this embodiment, the dimensions of the designed I-shaped structural casting are: the length of the connecting beam is 50mm, the height is 15mm, the thickness is 0.8mm, the size of the two wings is 30mm×40mm×8mm, and the radius of the transition fillet between the connecting beam and the two wings is 1.5mm .

[0036] Make a ceramic core with a size of 15mm×70mm×5mm, put it into the outer blank mold to press the wax pattern, combine it into a module, sprinkle sand with paint to prepare the mold shell, and dewax and sinter the mold shell after completion. Put the prepared mold shell into the directional solidification furnace, heat it to 1500°C, then melt the DD5 single crystal alloy, pour it into the mold shell at 1500°C, and then draw the single crystal casting at a speed of 3mm / min, and the drawing is completed Then break the vacuum and cool down. Then the vibrating riser cleans the mold shell, cuts the casting from the module, removes the residual mold shell and co...

Embodiment 2

[0038] In this embodiment, the dimensions of the designed I-shaped structural casting are: the length of the connecting beam is 50mm, the height is 15mm, the thickness is 0.8mm, the size of the two wings is 30mm×40mm×8mm, and the radius of the transition fillet between the connecting beam and the two wings is 1.5mm .

[0039] Make a ceramic core with a size of 15mm×70mm×5mm, put it into the outer blank mold to press the wax pattern, combine it into a module, sprinkle sand with paint to prepare the mold shell, and dewax and sinter the mold shell after completion. Put the prepared mold shell into the directional solidification furnace, heat it to 1500°C, then melt the DD407 single crystal alloy, pour it into the mold shell at 1500°C, and then draw the single crystal casting at a speed of 3mm / min, and the drawing is completed Then break the vacuum and cool down. Then the vibrating riser cleans the mold shell, cuts the casting from the module, removes the residual mold shell and ...

Embodiment 3

[0041] In this embodiment, the dimensions of the designed I-shaped structural casting are: the length of the connecting beam is 50mm, the height is 10mm, the thickness is 2mm, the size of the two wings is 30mm×40mm×8mm, and the radius of the transition fillet between the connecting beam and the two wings is 2mm.

[0042] Make a ceramic core with a size of 10mm×70mm×5mm, put it into the outer blank mold to press the wax mold, combine it into a module, sprinkle sand with paint to prepare the mold shell, and dewax and sinter the mold shell after completion. Put the prepared mold shell into the directional solidification furnace, heat it to 1500°C, then melt the DD5 single crystal alloy, pour it into the mold shell at 1500°C, and then pull the single crystal casting at a speed of 5mm / min, and the drawing is completed Cool down after breaking the vacuum. Then the vibrating riser cleans the mold shell, cuts the casting from the module, removes the residual mold shell and core with l...

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Abstract

The invention relates to the field of high-temperature alloys, in particular to a recrystallization tendency evaluation method for a nickel-based single crystal high-temperature alloy precision casting process. The method comprises the following steps: preparing a silicon oxide-based mold core by using a mold core mold, pressing a wax mold in an outer blank mold, combining to form a single crystalmodule, making a shell, drawing a single crystal sample in a directional solidification furnace, removing the mold shell and the mold core, carrying out heat treatment, and counting the area of recrystallized grains on the surface. Quantitative evaluation of the recrystallization tendency of the alloy by utilizing the recrystallization grain area is carried out. The larger the recrystallization area is, the stronger the alloy recrystallization tendency is. Under the condition that the same casting system is adopted, the recrystallization tendency of different single crystal high-temperature alloys is quantitatively characterized. According to the method, the problem that the recrystallization tendency of the single crystal high-temperature alloy is difficult to evaluate is solved, the recrystallization tendency of the existing single crystal high-temperature alloy is evaluated, and a basis is provided for alloy material selection. Recrystallization tendency evaluation can also be carried out on the newly developed single crystal high-temperature alloy, and the purpose of optimizing alloy components is achieved.

Description

technical field [0001] The invention relates to the field of high-temperature alloys, in particular to a recrystallization tendency evaluation method in the precision casting process of nickel-based single-crystal high-temperature alloys. Background technique [0002] Single crystal superalloys have become the materials of choice for advanced aero-engine hot-end components due to their excellent high-temperature mechanical properties and oxidation-corrosion resistance. However, during the production and use of single crystal superalloys, due to the shrinkage of the mold shell during the solidification of the single crystal, the mechanical removal of the mold shell, the grinding and shaping of the casting, and the sandblasting treatment, various degrees of plastic deformation will be introduced. Castings with plastic deformation will undergo recovery and recrystallization during high temperature heat treatment and high temperature process in actual use. As a structural defec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/28C30B11/00C30B29/52
Inventor 孟杰黄举王亮荀淑玲邹明科李金国金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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