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Controlled directional solidification nickel-base high-temperature alloy recrystallizing method

A nickel-based high-temperature alloy, directional solidification technology, applied in the direction of solid-state diffusion coating, metal material coating process, coating, etc., can solve the problems of inapplicability, and achieve the effects of easy storage, reduced recrystallization, and simple process equipment

Active Publication Date: 2011-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can remove the recrystallization layer, it is obviously not suitable for thin-walled single crystal or oriented columnar nickel-based superalloy components

Method used

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  • Controlled directional solidification nickel-base high-temperature alloy recrystallizing method
  • Controlled directional solidification nickel-base high-temperature alloy recrystallizing method
  • Controlled directional solidification nickel-base high-temperature alloy recrystallizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Carburizing combined with cyclic recovery heat treatment controls the recrystallization of DZ125L directionally solidified nickel-based superalloy.

[0029] The directionally solidified nickel-based superalloy plate is prepared by the directional solidification equipment, and a square of 3×12×12 mm is cut from the plate by wire cutting. Polish the surface of 12×12 (the growth direction of oriented columnar crystals), and carry out carburizing treatment with a micro-arc spark machine. The carburizing process equipment is a micro-arc spark processing machine 3H-ES-1500, the frequency of the micro-arc spark processing machine is 1000HZ, the power is 1000W, and the voltage is 50V. The carburizing process should try to keep the surface carburized layer uniform. The samples were then sandblasted with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass bal...

Embodiment 2

[0031] Example 2 Carburizing combined with cyclic recovery heat treatment controls the recrystallization of DZ17G directionally solidified nickel-based superalloy.

[0032]The directionally solidified nickel-based superalloy plate is prepared by the directional solidification equipment, and a square of 3×12×12 mm is cut from the plate by wire cutting. Polish the surface of 12×12 (the growth direction of oriented columnar crystals), and carry out carburizing treatment with a micro-arc spark machine. The carburizing process equipment is a micro-arc spark processing machine 3H-ES-1500, the frequency of the micro-arc spark processing machine is 1000HZ, the power is 1000W, and the voltage is 50V. The carburizing process should try to keep the surface carburized layer uniform. The samples were then sandblasted with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass ball....

Embodiment 3

[0034] Example 3 Carburizing combined with cyclic recovery heat treatment controls the recrystallization of DZ125L directionally solidified nickel-based superalloy.

[0035] The directionally solidified nickel-based superalloy plate is prepared by the directional solidification equipment, and a square of 3×12×12 mm is cut from the plate by wire cutting. Polish the surface of 12×12 (the growth direction of oriented columnar crystals), and carry out carburizing treatment with a micro-arc spark machine. The carburizing process equipment is a micro-arc spark machine 3H-ES-1500, the frequency of the micro-arc spark machine is 1000HZ, the power is 2000W, and the voltage is 50V. The carburizing process should try to keep the surface carburized layer uniform. The samples were then sandblasted with a sandblasting device. Sandblasting parameters are as follows: sandblasting pressure is 0.3MPa, sandblasting time is 1min, and the sand particles are SiO 2 Glass ball.

[0036] Next, tur...

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Abstract

The invention provides a controlled directional solidification nickel-base high-temperature alloy recrystallizing method, which is characterized in that: a carburization and circulating heat treatment combined process is adopted to perform the heat treatment on a deformed directional solidification nickel-base high-temperature alloy, and then the alloy is subjected to standard solution treatment; a carburization is a micro-arc-spark carburization, the carburization material is a graphite electrode, and the carburization process parameters include a frequency of 1,000 to 5,000Hz, a power of 500 to 3,000W and a voltage of 20 to 100V; and the highest heat treatment temperature in each period of a circulating heat treatment process is at least 20 DEG C lower than the solid solution temperature of the alloy, the lowest heat treatment temperature in each period is not lower than the aging heat treatment of the alloy, and 3 to 10 circulation periods are adopted. The method can reduce the recrystallization-nucleation on the surface of the alloy, inhibit the growth of recrystals, reduce the stored energy of the deformed alloy, and thus control the recrystallization and obviously reduce the recrystals generated after the deformation of the nickel-base high-temperature alloy.

Description

technical field [0001] The invention relates to recrystallization control technology, in particular to a technology for controlling the recrystallization of directional solidified columnar crystal or single crystal nickel-based superalloy in combination with carburizing and cyclic recovery heat treatment process. Background technique [0002] Gas turbine and aero-engine blades are used at higher temperatures, and the blades are mainly affected by centrifugal force. At high temperatures, the strength of the grain boundary is not as strong as the intragranular strength, and the transverse grain boundary becomes the weak link of the blade. For this reason, people have developed oriented columnar crystals or even single crystal blades to eliminate transverse grain boundaries or all grain boundaries. These blades have better longitudinal mechanical properties and higher temperature capability than conventional polycrystalline blades. [0003] However, during the directional soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C23C8/00
Inventor 谢光张健楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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