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Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade

A turbine blade and preparation technology, which is applied in the field of superalloys, can solve the problems of recrystallization of blades, nucleation and growth of miscellaneous crystals on the surface of castings, and easy supercooling, etc., to suppress miscellaneous crystals, avoid recrystallization, and avoid residual stress Effect

Active Publication Date: 2015-04-29
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solidification range of the single crystal alloy is wide, and the tail end of the metal platinum wire core support exposed to the surface of the blade casting will form a heat conduction bridge when the alloy solidifies, which will accelerate the local heat conduction, resulting in local overcooling during the solidification process and resulting in the casting The surface nucleates and grows into mixed crystals; and the end of the platinum wire core support exposed to the blade surface is fixed in the mold shell. During the solidification process of the blade surface, local residual stress will be formed, which will cause the blade to form recrystallization and other defects during heat treatment.

Method used

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  • Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade
  • Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade
  • Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade

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specific Embodiment approach

[0024] detailed description: Below in conjunction with accompanying drawing, the present invention will be further described:

[0025] The invention relates to a preparation process for preventing the formation of surface miscellaneous crystals and recrystallization of a single crystal hollow turbine blade. The steps of the process are as follows:

[0026] (a) Prepare the blade wax mold containing the core; place the ceramic core in the wax mold, and form a wax mold on the surface of the core (2), the wax mold is formed by injection molding, and the injection temperature is 63°C-68 ℃, the pressure is 0.3-0.5MPa, the injection time is 10-30 seconds, and the holding time is 10-30 seconds;

[0027] (b) Insert a platinum wire on the surface of the wax pattern to position the core; take the wax pattern, insert the platinum wire into the wax pattern perpendicular to the surface of the wax pattern, the insertion depth is equal to the thickness of the wax pattern, so that the insert...

Embodiment 1

[0034]Place the ceramic core in the wax mold. The wax mold is formed by injection molding. The injection temperature is 63°C, the pressure is 0.5MPa, the injection time is 10 seconds, and the pressure holding time is 10 seconds; take out the wax mold and place it perpendicular to the wax Insert the platinum wire into the wax mold in the direction of the mold surface, the insertion depth is equal to the thickness of the wax mold, and the insertion end of the platinum wire is in full surface contact with the ceramic core; the diameter of the platinum wire is 0.3mm, and the length of the platinum wire exposed to the surface of the wax mold is 5mm; wax balls are prepared by the liquid drop method at the exposed end of the platinum wire. The shortest distance h between the spherical surface of the wax ball and the surface of the wax model should not be less than 2mm. If it is larger than 1mm, the diameter of the wax ball is 1mm; the other part of the platinum wire exposed to the sur...

Embodiment 2

[0036] Place the ceramic core in the wax mold. The wax mold is formed by injection molding. The injection temperature is 65°C, the pressure is 0.5MPa, the injection time is 30 seconds, and the pressure holding time is 30 seconds; take out the wax mold and place it perpendicular to the wax Insert the platinum wire into the wax mold in the direction of the surface of the mold, the insertion depth is equal to the thickness of the wax mold, the insertion end of the platinum wire is in full surface contact with the ceramic core; the diameter of the platinum wire is 0.6mm, and the length of the platinum wire exposed to the surface of the wax mold is 8mm; the wax ball is prepared by droplet method at the exposed end of the platinum wire. The shortest distance h between the spherical surface of the wax ball and the surface of the wax model should not be less than 2mm. If it is larger than 1mm, the diameter of the wax ball is 3mm; the side part of the platinum wire exposed to the surfac...

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Abstract

The invention provides a preparation process for preventing the formation of surface impure crystals and recrystallization on a mono-crystal hollow turbine blade. According to the preparation process, a spherical wax piece is arranged at an exposed part (tail end) of a positioning platinum wire; a thin wax film is brushed on the other exposed parts; the exposed part is covered with a fireproof material which is the same as a mold shell material in a shell making process; after de-waxing, an end part spherical cavity and a platinum wire face micro-gap are formed; a heat insulation cavity is formed by the cavity and the side micro-gap in a vacuum induction furnace in a mono-crystal preparation process; a heat bridge effect of the exposed platinum wire part is avoided so that an alloy is prevented from partial overcooling and the formation of impure crystal is inhibited; and furthermore, the cavity and the platinum wire side micro-gap provide a releasing space to the deformation of the platinum wire and the partial residual stress is prevented from occurring, and the recrystallization is prevented from occurring in a post heat treatment process of the blade.

Description

technical field [0001] The invention provides a preparation process for preventing the formation of surface miscellaneous crystals and recrystallization of a single crystal hollow turbine blade, belonging to the technical field of superalloys. Background technique [0002] Single crystal nickel-based superalloys have excellent high temperature properties. At present, it has become the main material of advanced aero-engine and gas turbine blades. Due to the high intake temperature requirements of aero-engines, the blade material must also use gas cooling technology to meet the use requirements. Therefore, hollow single crystal blades are widely used in modern engines. [0003] Hollow single crystal blades are generally prepared by precision casting. The hollow part is formed with a ceramic core. In the process of investment mold preparation, although the displacement of the core can be restricted by reasonably selecting the connection method between the positioning end of...

Claims

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Application Information

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IPC IPC(8): B22C9/04C30B29/52
Inventor 毛萍莉姜卫国刘正王峰
Owner SHENYANG POLYTECHNIC UNIV
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