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Acta Metall Sin  2019, Vol. 55 Issue (9): 1185-1194    DOI: 10.11900/0412.1961.2019.00085
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Deformation Behavior and Strengthening-Toughening Mechanism of GH4169 Alloy with Multi-Field Coupling
WANG Lei(), AN Jinlan, LIU Yang, SONG Xiu
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
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Abstract  

The superalloy is one of key metal materials, representing the level of scientific and technological development. Nickel-based superalloy is the most important which has been widely used for rotating component of aerospace. Nickel-based GH4169 alloy shows excellent combination properties including good fatigue property, excellent oxidation and corrosion resistance, as well as the microstructure stability during long-term ageing. The using amount of GH4169 alloy is about 45% of total wrought superalloys. For satisfying high performance of aero-engine, both strength and ductility of GH4169 alloy at high temperature are required to be simultaneously improved for safety servicing. It is an effective method to strengthen alloys by adding alloying elements. The alloying element addition ratio of GH4169 alloy is more than 40%, which unavoidably leads to hard deforming and plasticity declining, so that it restricts the further application of the alloy. Therefore, it is key to find methods realizing strengthening-toughening and without any losing of hot-deforming ability. In this work, the plastic deformation behavior and strengthening-toughening mechanisms of GH4169 alloy with multi-field coupling (electric-pulse current (EPC)/temperature/stress) were investigated. The results show that the deformation resistance of GH4169 alloy decreases and plastic deformation ability increases with multi-field coupling. The thermal vibration of atoms enhances and thus leads to decreasing of Peierls force with multi-field coupling, which is the essential factor on decreasing of deformation resistance and increasing of plastic deformation coordinate ability. When the alloy aged with electric-pulse treatment (EPT)/temperature coupling, the ultimate strength, yield strength and fracture elongation increase simultaneously at elevated temperatures. The vacancy concentration increases of the alloy aged with EPT/temperature coupling. Vacancy induces ultrafine nm-sized γ" phase to precipitate during tensile deformation at high temperature, which is the key factor on strength and ductility improvement. At the same time, because of the EPT/temperature coupling ageing, part of γ" phases precipitate around dislocation, while, due to the increasing of γ" phase size, the ductility of the alloy will be improved. With the multi-field coupling treatment, the strengthening-toughening of GH4169 alloy can be realized depended on an appropriate distribution of two kind sizes of γ" phase.

Key words:  GH4169 alloy      multi-field coupling      plastic deformation      strengthening-toughening     
Received:  27 March 2019     
ZTFLH:  TG132.3  
Fund: Supported by National Natural Science Foundation of China(Nos.U1708253,51571052);Scientific Research Foundation of Shenyang Aerospace University(No.18YB55)
Corresponding Authors:  Lei WANG     E-mail:  wanglei@mail.neu.edu.cn

Cite this article: 

WANG Lei, AN Jinlan, LIU Yang, SONG Xiu. Deformation Behavior and Strengthening-Toughening Mechanism of GH4169 Alloy with Multi-Field Coupling. Acta Metall Sin, 2019, 55(9): 1185-1194.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00085     OR     https://www.ams.org.cn/EN/Y2019/V55/I9/1185

Fig.1  Schematic of tensile specimen size (unit: mm)
Fig.2  SEM (a) and TEM (b) images of GH4169 alloy after solution heat treatment (Inset shows the SAED pattern)
Temperature / ℃Frequency / Hzσb / MPaσs / MPaδk / %
750067132119.4
1067033319.2
3063730018.3
4051532521.8
80005424439.2
1045737521.9
3042035826.2
4029424129.1
850033731332.1
1026422933.9
3019419436.5
4015115140.3
Table 1  Yield strength, ultimate strength and elongation of GH4169 alloy tensile deformed with multi-field coupling at elevated temperatures
Fig.3  The fracture surface morphologies of GH4169 alloy tensile deformed multi-field coupling (EPC—electric-pulse current)(a) 750 ℃, 0 Hz-EPC (b) 750 ℃, 40 Hz-EPC (c) 800 ℃, 0 Hz-EPC(d) 800 ℃, 40 Hz-EPC (e) 850 ℃, 0 Hz-EPC (f) 850 ℃, 40 Hz-EPC
Fig.4  Stress-strain curves of GH4169 alloy with EPC removed and recovered at different deforming stages with multi-field coupling(a) deformation of 1.8%-σs (b) deformation of 5%-plastic deforming behavior before necking(c) deformation of 11%-σb (d) deformation of 18%-plastic deforming behavior after necking
Fig.5  Dislocation configurations in GH4169 alloy tensile deformed at 800 ℃ with 5% strain with/without multi-field coupling(a) non-EPC (b) 40 Hz-EPC
Fig.6  TEM images of γ" phase in GH4169 alloy tensile deformed at 800 ℃ with 12% strain with/without multi-field coupling(a) non-EPC (b) 40 Hz-EPC
Fig.7  SEM images of cross-section near fracture surface in GH4169 alloy tensile deformed at 800 ℃ with/without multi-field coupling(a) non-EPC (b) 40 Hz-EPC
Fig.8  Morphologies of δ phase in GH4169 alloy tensile deformed at 800 ℃ with 12% strain with/without multi-field coupling(a) non-EPC (b) 40 Hz-EPC
Fig.9  Tensile stress-strain curves of GH4169 alloy deformed at 750 ℃ after aged with/without multi-field coupling for 20 min
Fig.10  Tensile stress-strain curves of GH4169 alloy deformed at 800 ℃ after aged with/without multi-field coupling for 5 min (a), 10 min (b) and 20 min (c)
Fig.11  TEM images of microstructures in GH4169 alloy deformed at 800 ℃ with 5% strain after aged with/without multi-field coupling for 20 min(a) non-electric pulse treatment (EPT) (b) 10 Hz-EPT (c) 40 Hz-EPT
Fig.12  Morphologies of ultrafine nm-sized γ" phase in GH4169 alloy deformed at 800 ℃ with 5% strain after aged with multi-field coupling (40 Hz-EPT) at 800 ℃ for 20 min(a) TEM image taken along <110> (Inset shows the SAED pattern)(b) high-angle annular-dark-field (HAADF) STEM image of ultrafine nm-sized γ" phase
Fig.13  TEM images of cross-section near tensile fracture surface in GH4169 alloy deformed at 800 ℃ after aged with/without multi-field coupling for 20 min(a) non-EPT (b) 10 Hz-EPT (c) 40 Hz-EPT
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