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DC solution treatment method and device for single-crystalline high-temperature alloy

A high-temperature alloy and solid solution treatment technology, which is applied in the field of heat treatment of metal materials, can solve the problems of high direct solution treatment temperature and long time, and achieve the effect of reducing the solution treatment temperature and shortening the solution treatment time

Inactive Publication Date: 2008-11-12
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

[0004] The object of the present invention aims at the shortcomings of the existing single crystal superalloy solid solution treatment process, and provides a single crystal superalloy direct current solution treatment method and device that solve the high temperature and long time of single crystal superalloy direct solution treatment

Method used

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  • DC solution treatment method and device for single-crystalline high-temperature alloy
  • DC solution treatment method and device for single-crystalline high-temperature alloy
  • DC solution treatment method and device for single-crystalline high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Connect a nickel-based single crystal superalloy (DD3) rod to the two poles of the regulated power supply, put it into a horizontal resistance furnace and heat it to the solution treatment temperature, then turn on the power supply connected to the single crystal superalloy, and let the DC current flow through Single crystal superalloys are solution treated under the action of electric current. The current density is 5A / cm 2 , the holding temperature is 1220°C, and the holding time is 4 hours.

[0020] figure 2 A comparison chart of the W element distribution of the nickel-based single crystal superalloy DD3 after adopting the present invention and conventional solution treatment is provided. figure 2 a is the surface distribution of W element without DC current solution treatment, figure 2 b is the surface distribution diagram of W element when DC current solution treatment is applied. It can be seen by comparison, figure 2 The distribution of W elements in b ...

Embodiment 2

[0022] Connect the DD3 nickel-based single crystal superalloy rod to the two poles of the regulated power supply, put it into a horizontal resistance furnace and heat it to the solution treatment temperature, then turn on the power supply connected to the single crystal superalloy, so that the DC current passes through the single crystal superalloy , solid solution treatment is carried out under the action of electric current. The current density is 5A / cm 2 , the holding temperature is 1250°C, and the holding time is 0.5 hours.

[0023] image 3 A comparison chart of the microstructure of the nickel-based single crystal superalloy DD3 after adopting the present invention and conventional solution treatment is provided. image 3 a is a scanning electron micrograph of the microstructure after conventional solution treatment (without applying direct current), image 3 b is a scanning electron micrograph of solid solution treatment with DC current applied. image 3 There are a...

Embodiment 3

[0025] The difference from Example 1 is:

[0026] The nickel-based single crystal superalloy is DD8, and the current density is 100A / cm 2 , the holding temperature is 1230°C, and the holding time is 2 hours.

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Abstract

The invention discloses a DC solutionizing disposing method and device of single-crystal high-temperature alloy in the metal material heat disposal domain, which is characterized by the following: connecting two ends of cast single-crystal high-temperature alloy on two DC power electrodes through oriental coagulation technique; putting in the horizontal resistant furnace to heat to coagulation disposal temperature; starting power to flow DC power with current density at 0.1-100A / cm2; selecting coagulation disposal temperature between gamma-phase fusing temperature and alloy fusing point; insulating for 0.25-46h. The device contains DC stable pressure power, heat insulting system, sample and conductor, wherein the DC stable pressure power forms cascading circuit with conductor and sample, which are placed in the heat insulating system.

Description

technical field [0001] The invention relates to the field of heat treatment of metal materials, in particular to a direct current solid solution treatment method and device for single crystal superalloys. Background technique [0002] Superalloys came out in the 1940s. Due to their excellent performance under high temperature conditions, they are widely used in aviation, aerospace, nuclear engineering, energy transportation, petrochemical, metallurgy and other fields. In particular, single crystal superalloys have superior mechanical properties, and single crystal superalloy turbine blades are used in advanced aero-engines. Single crystal superalloys are prepared by directional solidification technology, and then undergo solution treatment and aging treatment before they can be used. The purpose of solid solution treatment of superalloys is to dissolve the second phase (γ′ phase) precipitated during the solidification process of single crystal superalloys into the matrix as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C21D1/00
Inventor 杨院生李应举冯小辉张宇男童文辉胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI