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
CN102071384AActive Publication Date: 2011-05-25INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Publication Date
2011-05-25

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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.
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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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