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Eliminating method for brittle phase in laser-repaired nickel-base high temperature alloy

A nickel-based superalloy, laser repair technology, applied in metal material coating process, coating and other directions, can solve the problems of the influence of material mechanical properties, the inability to completely eliminate the Laves brittle phase, and the limited effect of Laves phase control.

Active Publication Date: 2019-01-11
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of control effect, these auxiliary measures have limited effect on the control of Laves phase. Although it can reduce its volume fraction to a certain extent, it still cannot completely eliminate the Laves brittle phase, and the mechanical properties of the repaired material are still affected to a certain extent.

Method used

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  • Eliminating method for brittle phase in laser-repaired nickel-base high temperature alloy
  • Eliminating method for brittle phase in laser-repaired nickel-base high temperature alloy
  • Eliminating method for brittle phase in laser-repaired nickel-base high temperature alloy

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Effect test

Embodiment 1

[0029] (1) Laser repair of nickel-based superalloys

[0030] Mechanically remove and polish the repaired parts of the nickel-based superalloy specimen with alloy grade of GH4169, and clean the repaired parts with alcohol and acetone; fix and clamp the nickel-based superalloy specimen on the CNC workbench, The coaxial powder feeding laser repair method is used to laser repair the area to be repaired to restore the shape and size of the parts and samples.

[0031] (2) Elimination of brittle phases in laser repair of nickel-based superalloys

[0032] δ aging treatment: Put the above-mentioned nickel-based superalloy sample after laser repair into the muffle furnace, heat up to 890°C at 10°C / min, and keep it for 12h;

[0033] δ solution treatment: After the δ aging treatment, the furnace temperature is increased to 1020 ℃ at 10 ℃ / min, and the temperature is kept for 4 hours. After the temperature is finished, the sample is taken out and cooled to room temperature.

[0034] The metallograph...

Embodiment 2

[0038] (1) Laser repair of nickel-based superalloys

[0039] Mechanically remove and polish the repaired parts of the nickel-base superalloy sample with alloy grade of DZ125, and clean the repaired parts with alcohol and acetone; fix and clamp the nickel-base superalloy sample on the CNC workbench. The coaxial powder feeding laser repair method laser repairs the area to be repaired to restore the shape and size of the parts and specimens.

[0040] (2) Elimination of brittle phases in laser repair of nickel-based superalloys

[0041] δ aging treatment: Put the above-mentioned repaired nickel-based superalloy sample into a muffle furnace, and heat up to 960°C at 20°C / min, and keep it for 10 hours;

[0042] δ solution treatment: After the δ aging treatment, the furnace temperature is increased to 1030°C at 20°C / min, and the temperature is kept for 6 hours. After the heat preservation is completed, the sample is taken out and cooled to room temperature.

[0043] The metallographic structur...

Embodiment 3

[0045] (1) Laser repair of nickel-based superalloys

[0046] Mechanically remove and polish the repaired parts of the GH3625 nickel-based superalloy sample, and clean the repaired parts with alcohol and acetone; fix and clamp the nickel-based superalloy sample on the CNC workbench. The coaxial powder feeding laser repair method laser repairs the area to be repaired to restore the shape and size of the parts and specimens.

[0047] (2) Elimination of brittle phases in laser repair of nickel-based superalloys

[0048] δ aging treatment: Put the above-mentioned repaired nickel-based superalloy sample into the muffle furnace, heat up to 970°C at 15°C / min, and keep it for 8h;

[0049] δ solution treatment: After the δ aging treatment is completed, the furnace temperature is increased to 1035 ℃ at 15 ℃ / min, and the temperature is kept for 3 hours. After the temperature is finished, the sample is taken out and cooled to room temperature.

[0050] The metallographic structure observation and s...

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Abstract

The invention provides an eliminating method for a brittle phase in a laser-repaired nickel-base high temperature alloy, and belongs to the technical field of metal material heat treatment. The eliminating method comprises the steps that the laser-repaired nickel-base high temperature alloy is sequentially subjected to delta aging treatment and delta solution treatment, wherein the temperature ofdelta aging treatment is 850-970 DEG C, and the temperature of delta solution treatment is 1015-1035 DEG C. In the method, delta aging treatment is carried out on the laser-repaired nickel-base high temperature alloy at first, and the Laves brittle phase is eliminated; and then delta solution treatment is carried out at the temperature of 1015-1035 DEG C for eliminating the delta phase separated out in the previous step. Since the temperature of delta solution treatment is lower than the solution temperature for eliminating the Laves phase in conventional heat treatment, damage caused by hightemperature solution on the alloy structure and the mechanical property can be avoided, and the mechanical property of the nickel-base high temperature alloy is obviously improved along with eliminating of the Laves phase.

Description

Technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a method for eliminating brittle phases in a nickel-based superalloy by laser repair. Background technique [0002] Nickel-based superalloys have excellent comprehensive properties such as yield strength, tensile strength, creep resistance, good oxidation resistance, corrosion resistance, and radiation resistance at higher temperatures, and are widely used in aerospace, nuclear energy, and petroleum , Automotive and other fields. As an important engineering material, nickel-based superalloys are mostly used in high temperature, high pressure, corrosion, vibration and other harsh environments and service conditions. They are also used as preparation materials for key parts, which are difficult to process and have high value. The loss of parts during service is inevitable, and for nickel-based superalloy parts, the replacement cost after damage is high. There...

Claims

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Application Information

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IPC IPC(8): C22F1/10C23C24/10
CPCC22F1/10C23C24/103
Inventor 刘奋成吕飞阅黄春平
Owner NANCHANG HANGKONG UNIVERSITY
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