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Wearable Materials
The Customized Heat Treatment For Enhancing The High-temperature Durability Of Laser-directed Energy Deposition-repaired Single-crystal Superalloys.

Home
Research Domains
Engineering
Materials Engineering
Wearable Materials
The Customized Heat Treatment For Enhancing The High-temperature Durability Of Laser-directed Energy Deposition-repaired Single-crystal Superalloys.

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The Customized Heat Treatment for Enhancing the High-Temperature Durability of Laser-Directed Energy Deposition-Repaired Single-Crystal Superalloys.

Yimo Guo^1,2, Nannan Lu², Pengfei Yang^1,2

¹School of Materials and Engineering, Northeastern University, Shenyang 110819, China.

Materials (Basel, Switzerland)

|November 27, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

A new heat treatment significantly improves the high-temperature durability of laser-directed energy deposition (L-DED) repaired single-crystal (SX) superalloys. This process preserves the SX structure and enhances creep life by preventing recrystallization and carbide precipitation.

Keywords:

directed energy deposition heat treatment high-temperature durability microporous fracture

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Area of Science:

Materials Science
Metallurgy
Mechanical Engineering

Background:

High-temperature durability is critical for single-crystal (SX) superalloys in demanding applications.
Laser-directed energy deposition (L-DED) is a promising repair technique for these alloys.
Optimizing post-repair heat treatment is essential for restoring performance.

Purpose of the Study:

To develop and evaluate a specialized heat treatment for L-DED-repaired SX superalloys.
To investigate the impact of this new treatment on microstructure and high-temperature mechanical properties.
To compare the performance of the custom heat treatment against standard procedures.

Main Methods:

Laser-directed energy deposition (L-DED) was used to repair DD32 SX superalloy.

single-crystal superalloy

A newly customized heat treatment process was applied.

Microstructural analysis (SX structure, γ' phase size, carbide precipitation) was performed.

High-temperature creep testing at 1000 °C/280 MPa was conducted.

Main Results:

The custom heat treatment maintained the SX structure in the L-DED repaired zone, with fine γ' precipitates (236 nm, 69% volume fraction).
Standard heat treatment resulted in recrystallized grains and larger γ' precipitates (535 nm) with grain boundary carbides.
Custom heat-treated specimens exhibited a durable life of 19.09 h, fracturing in the repair zone.
Standard heat-treated specimens had a durable life of 8.70 h, fracturing in the matrix.

Conclusions:

The specialized heat treatment effectively preserves the single-crystal structure and optimizes microstructure in L-DED repaired superalloys.
This custom process significantly enhances high-temperature creep performance and durable life compared to standard treatments.
Interdendrite carbide remains a critical factor influencing crack initiation in both conditions.