Sub-solvus recovery heat treatment for service microstructure damage of DZ125 turbine blades

Mengyuan ZHAI, Yikai SHAO, Huiming WANG, Weiwei ZHENG

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (6) : 1-11. DOI: 10.11868/j.issn.1001-4381.2024.000674
REPAIR TECHNOLOGY OF AERO-ENGINE AND GAS TURBINE BLADES COLUMN

Sub-solvus recovery heat treatment for service microstructure damage of DZ125 turbine blades

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Abstract

By dissecting DZ125 turbine blades that have been in actual service for 499 h and integrating an artificial neural network model to assess the service temperature and stress in various blade components， the normal and overtemperature service tissues of the turbine blades have been identified. Focusing on DZ125 alloy for turbine blades， simulations of normal and overtemperature service conditions are conducted through variable cross-section experiments at 925 ℃/32-200 MPa/500 h and 1075 ℃/10-60 MPa/100 h， respectively. Both service structures undergo sub-solvus recovery heat treatment at a solid solution temperature of 1200 ℃， and the impacts of this treatment on both service structures are observed. The results reveal that the most severely damaged part of the DZ125 turbine blade is the leading edge in the middle of the blade， with a maximum service temperature of 1075 ℃. The microstructure degradation of DZ125 alloy is more pronounced at 1075 ℃ compared to 925 ℃. Following sub-solvus recovery heat treatment， the normal service structure simulated at 925 ℃ with variable cross sections exhibits degradation， whereas the overtemperature service structure simulated at 1075 ℃ with variable cross sections shows precipitation of cubic secondary γ′ phase. Notably， after sub-solvus recovery heat treatment， the creep life of DZ125 alloy in a specific overtemperature service damage state increases from 16 h to 25 h under conditions of 980 ℃/220 MPa. The sub-solvus recovery heat treatment proves detrimental to the normal temperature service microstructure but has a beneficial recovery effect on the overtemperature service microstructure.

Key words

DZ125 turbine blade / overtemperature service microstructure / variable section test / sub-solvus recovery heat treatment

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Mengyuan ZHAI , Yikai SHAO , Huiming WANG , et al. Sub-solvus recovery heat treatment for service microstructure damage of DZ125 turbine blades. Journal of Materials Engineering. 2025, 53(6): 1-11 https://doi.org/10.11868/j.issn.1001-4381.2024.000674

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