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

A nickel-based superalloy, directional solidification technology, applied in chemical instruments and methods, crystal growth, post-processing details, etc., can solve the problem of unsuitable thin-walled single crystal superalloys, reduce residual stress, reduce recrystallization, The effect of depleting stored energy

Active Publication Date: 2011-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • 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 superalloys.

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 3

[0033] Example 3 DZ125L directionally solidified nickel-based superalloy recrystallization control.

[0034] The DZ125L directionally solidified nickel-based superalloy plate was prepared by the directional solidification equipment, and a 2×12×12mm square was cut from the plate by wire cutting. Polish the plane of 12×12 (direction of oriented columnar crystal growth), and perform sandblasting treatment with a sandblasting device. The sandblasting parameters are as follows: the sandblasting pressure is 0.3MPa, the sandblasting time is 1min, and the sand particles are Si0 2 Glass ball.

[0035] The coating is applied by arc ion plating equipment, and the coating is C / NiCoCrAlYSiB. During the coating process, a layer of graphite is firstly coated, and the coating time is 1 hour, and then a layer of NiCoCrAlYSiB is coated, and the coating time is 8 hours. The prepared samples are coated samples.

[0036] Next, turn on the heat treatment furnace and set the heat treatment progr...

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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 coating and circulating heat treatment combined process is adopted to treat a deformed directional solidification nickel-base high-temperature alloy and then the alloy is subjected to standard solution treatment; a coating is made of Zr / NiCoCrAlYSiB, Zr / ZrO2 / NiCoCrAlYSiB, NiCoCrAlYSiB or C / NiCoCrAlYSiB; 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 recrystallization-nucleation and oxidization on the surface of the alloy, reduce the stored energy of the deformed alloy and thus control the nickel high-temperature alloy to recrystallize.

Description

technical field [0001] The invention relates to recrystallization control technology, and in particular provides a technology for controlling the recrystallization of directionally solidified nickel-based columnar crystals or nickel-based single-crystal superalloys by coating coating combined with a 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, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D1/68C30B33/02
Inventor 谢光张健楼琅洪孙超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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