基于析出相转变与形貌演化的GH4169合金屈服强度模型

doi:10.7527/S1000-6893.2026.34017

Abstract

Abstract:

As a precipitation-strengthened nickel-based superalloy， GH4169 undergoes a gradual transformation of the γ″ strengthening phase into the δ phase during long-term service at temperatures above 650 ℃， resulting in significant degradation of its high-temperature strength. For components subjected to long-term service， the residual yield strength after high-temperature exposure is a fundamental parameter for evaluating their load-bearing capacity and fatigue life. However， the quantitative correlations among high-temperature precipitate transformation， morphological evolution， and residual strength degradation remain insufficiently understood. To address this issue， the precipitate evolution and yield strength variation of GH4169 alloys with three different initial microstructural states， namely the commercial， standard heat-treated， and improved states， were systematically investigated before and after high-temperature aging. The results showed that aging at 800 ℃ significantly promoted the transformation of the γ″ phase into the δ phase. The commercial and standard heat-treated samples were mainly characterized by intragranular precipitate coarsening and the growth of needle-like δ precipitates， whereas the improved sample primarily exhibited slow coarsening of grain-boundary δ precipitates. Based on the microstructural characterization results， a yield strength model incorporating the transformation of the γ″ phase into the δ phase and the morphological evolution of non-spherical precipitates was established using experimentally measured microstructural parameters， including grain size， matrix composition， precipitate size and volume fraction， and dislocation density. In the model， Nb-rich precipitates were classified according to their morphology and size into nanoscale γ″ precipitates， granular or short-rod precipitates， and needle-like δ precipitates， and their strengthening contributions were evaluated separately. The predicted yield strengths agreed well with the experimental values at room temperature and 650 ℃， with errors below 8%. The results provide a microstructure-parameterized approach for evaluating the residual strength of GH4169 alloy after long-term high-temperature exposure.

Key words: GH4169 alloy, high-temperature aging, δ phase transformation, precipitate evolution, precipitation strengthening, yield strength model

CLC Number:

V252.2

Shihui HE, Hongwei GAN, Xin FENG, Gang YANG, Xiaogang WANG, Chao JIANG. A yield strength model for GH4169 alloy based on precipitate transformation and morphological evolution[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(19): 66340178.

Figures/Tables 11

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 1

Chemical compositions of matrix and γ″ phase in reference sample［28，30］

元素	强化系数 β_i /MPa	基体原子分数 $x i B$	γ″相原子分数x_γ″，_i
Fe	153	0.255 4	0.021 1
Cr	337	0.234 8	0.021 6
Al	225	0.005 8	0.003 5
Ti	775	0.004 7	0.055 9
Mo	1 015	0.021 3	0.013
Nb	1 183	0.015 9	0.200 7

Table 1

Table 2

Fig.7

Fig.8

Fig.9

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参数	数值
k/（MPa⋅μm^1/2）	600
γ_APB/（J⋅m^-2）	0.3^［27］
μ/GPa	80^［13］
b/nm	0.253^［29］
M	3.06^［29］

A yield strength model for GH4169 alloy based on precipitate transformation and morphological evolution

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References 33

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[1]	MA Yiwei, WANG Zhihong, LIU Dong, ZHU Xinglin, YANG Zhishuo. Optimization of Rotational Speed of Main Roll in Profile Ring Rolling of GH4169 Alloy [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011, 32(8): 1555-1562.
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