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Acta Metall Sin  2016, Vol. 52 Issue (2): 151-160    DOI: 10.11900/0412.1961.2015.00414
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INFLUENCE OF MULTI-MICROSTRUCTURE INTERACTION ON FATIGUE CRACK GROWTH RATE OF GH4738 ALLOY
Qiliang NAI,Jianxin DONG(),Maicang ZHANG,Zhihao YAO
School of Materials Scienc and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Qiliang NAI,Jianxin DONG,Maicang ZHANG,Zhihao YAO. INFLUENCE OF MULTI-MICROSTRUCTURE INTERACTION ON FATIGUE CRACK GROWTH RATE OF GH4738 ALLOY. Acta Metall Sin, 2016, 52(2): 151-160.

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Abstract  

The effects of microstructure on the fatigue crack growth behavior of hard-to-deformed GH4738 superalloy have been studied by a number of researchers. However, most of these studies are confined to a single factor, such as the effect of grain size on the fatigue crack growth rate, and show the effect of single factor which do not reflect the combined impacts of multi-microstructure factors. Therefore, there is a need to develop a quantitative approach to predict the effects of multi-microstructure on fatigue crack growth behavior in the design of GH4738 alloy with high damage-tolerant microstructure. A new multi-microstructure factors interaction equation is proposed for the prediction of the effects of grain size, γ′ size and carbide size on fatigue crack growth rate of GH4738 alloy in this work. Different microstructures of GH4738 alloy are produced by different heat treatments (HT) for this equation. The fatigue crack growth experiments are carried out under constant stress ranges on compact tension (CT) specimens at 650 ℃ in air. Subsequently, the effects of grain size, γ′ size and grain boundary carbides size on the fatigue crack growth rate of GH4738 alloy are analyzed by using the interaction equation of multi-microstructure factors. The results show that the equation can well predict the fatigue crack growth rate of GH4738 alloy under different microstructures. The growth rate of fatigue crack in GH4738 can be decreased with increasing grain size and reducing γ′ size and carbide size. The effect of grain size on fatigue crack growth rate is more notice able than that of γ′ and carbide sizes.
Key words:  GH4738 alloy      multi-microstructure factor      fatigue crack growth rate      interaction influence     
Received:  24 July 2015     
Fund: Supported by National Natural Science Foundation of China (No.51371023)
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Qiliang NAI
Jianxin DONG
Maicang ZHANG
Zhihao YAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00414     OR     https://www.ams.org.cn/EN/Y2016/V52/I2/151

Condition Solution treatment Stabilizing treatment Aging treatment
A 1060 ℃, 4 h+W.Q. - 800 ℃, 16 h+A.C.
B 1100 ℃, 4 h+W.Q. 845 ℃, 24 h+A.C. 760 ℃, 24 h+A.C.
C 1120 ℃, 4 h+W.Q. 845 ℃, 4 h+A.C. 760 ℃, 8 h+A.C.
D 1140 ℃, 4 h+W.Q. 845 ℃, 48 h+A.C. 760 ℃, 16 h+A.C.
E 1160 ℃, 4 h+W.Q. - 800 ℃, 50 h+A.C.
Table 1  Heat treatment processes of GH4738 alloy
Fig.1  Compact tension specimen of crack propagation test (unit: mm)
Fig.2  OM images of GH4738 alloy after solution treatments at 1060 ℃ (a), 1120 ℃ (b) and 1160 ℃ (c) for 4 h
Fig.3  Carbide morphologies of GH4738 alloy after A (a), B (b), D (c) and E (d) heat treatments
Fig.4  γ′ morphologies of GH4738 alloy afte A (a), C (b) and D (c) heat treatments
Heat treatment Grain size / mm γ′ size / nm Carbide size / nm
A 303.4 49.2 326.4
B 382.1 82.6 517.9
C 423.7 60.4 452.3
D 459.4 102.9 560.5
E 479.3 79.0 350.0
Table 2  Grain size, γ′ size and carbide size of GH4738 alloy after different heat treatments
Fig.5  Fatigue crack growth rate curve and fracture morphology after C heat treatment (da/dN—fatigue crack growth rate, a—crack length)
Fig.6  da/dN-ΔK curves of GH4738 alloy after A, B and E heat treatments (ΔK—stress intensity factor range)
Fig.7  Fracture morphologies of the fatigue initiation areas of GH4738 alloy after A (a), B (b) and E (c) heat treatments
Fig.8  Fracture morphologies of Paris areas of GH4738 alloy after A (a), B (b) and E (c) heat treatments
Fig.9  da/dN-ΔK curves after C and D heat treatments
Fig.10  Fracture morphologies of Paris areas after C (a) and D (b) heat treatments
Fig.11  Comparison between predicted and measured data of da/dN
Fig.12  TEM images of fracture surfaces after A (a) and D (b) heat treatments
Fig.13  Comparisons between the predicted and experimental da/dN-ΔK curves
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