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Acta Metall Sin  2018, Vol. 54 Issue (11): 1653-1664    DOI: 10.11900/0412.1961.2018.00340
Materials and Processes Current Issue | Archive | Adv Search |
Microstructure Evolution of Inconel 718 Superalloy During Hot Working and Its Recent Development Tendency
Yongchang LIU(), Hongjun ZHANG, Qianying GUO, Xiaosheng ZHOU, Zongqing MA, Yuan HUANG, Huijun LI
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
Cite this article: 

Yongchang LIU, Hongjun ZHANG, Qianying GUO, Xiaosheng ZHOU, Zongqing MA, Yuan HUANG, Huijun LI. Microstructure Evolution of Inconel 718 Superalloy During Hot Working and Its Recent Development Tendency. Acta Metall Sin, 2018, 54(11): 1653-1664.

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Abstract  

Here some critical issues existed during forging process of Inconel 718 disks involving recrystallization mechanisms, grain growth, δ-phase morphology control and residual stress are explained. Based on the potential application prospect of selective laser melting in additive manufacture of aerocraft engine components, the specialized anisotropic microstructure and mechanical performance resulted from the rapid solidification process in selective laser melting are analyzed. Furthermore, the importance and difficulty of heat treatment in eliminating Laves-phase as well as tailoring substructure and related mechanical behavior are also discussed. The deformation mechanisms of Inconel 718 alloy at high temperature are illustrated in detail, comprising of dislocation planar slip, twinning and dislocation-shearing γ″ precipitates in complex modes. At last, a newly developed wrought nickel superalloy (Allvac 718Plus, with a increase in service temperature of 55 ℃ as compared to that of Inconel 718) is introduced, and some recent progresses aimed at modifying chemical compositions and phase compositions to improve service temperature on the basis of Inconel 718 alloy are also reviewed. The results indicate that the more stable γ″-γ' composite structure is important for the further design of next-generation wrought nickel superalloys.

Key words:  Inconel 718 alloy      recrystallization      selective laser melting      dislocation-shearing mechanism      γ″-γ' strengthened superalloy;     
Received:  23 July 2018     
ZTFLH:  TG113.12  
Fund: Supported by National Natural Science Foundation of China (Nos.51474156, 51604193 and U1660201) and National High Technology Research and Development Program of China (No.2015AA042504)

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00340     OR     https://www.ams.org.cn/EN/Y2018/V54/I11/1653

Fig.1  Schematic diagram of Delta processing for Inconel 718 alloy[23]
Fig.2  The influence of recrystallized structure on δ precipitation in Inconel 718 alloy (DRX—dynamic recrystallization)[25]
Fig.3  Anisotropic microstructures of Inconel 718 alloy processed by selective laser melting (SLM)
(a) columnar substructure parallel to the building direction
(b) cellular substructure perpendicular to the building direction
Specimen ID SR/Q HIP/SC Homo/Q ST/Q Age 1 Age 2 UTS / MPa YS / MPa δ / %
554 - - - - 995.2±12.8 698.2±15.2 33.21±1.10
528 - - - - 720/8 - 1392.0±8.9 1204.1±8.6 17.32±0.71
527 - - - - 720/8 620/10 1739.5±17.7 1268.5±27.0 15.44±2.00
522 - - - 1010/1 720/8 620/10 1379.3±10.4 1237.8±13.4 19.49±0.54
553 1066/1.5 - - - - - 1171.4±12.8 859.5±22.9 34.34±1.52
515 1066/1.5 - - - 720/8 - 1330.8±21.4 1124.4±18.9 21.34±0.80
514 1066/1.5 - - - 720/8 620/10 1386.9±12.3 1200.6±9.5 20.78±0.25
509 1066/1.5 - - 1010/1 720/8 620/10 1390.2±8.1 1203.3±5.5 21.96±0.37
507 1066/1.5 1163/3 - 954/1 720/8 620/10 1384.7±6.2 1087.2±7.5 23.36±0.62
506 1066/1.5 1163/3 1163/1 954/1 720/8 620/10 1395.7±4.2 1110.9±7.4 23.61±0.36
Table 1  Tensile properties of SLM-processed Inconel 718 alloy after experiencing different heat treatments[47]
Sample Building direction HT Creep test parameter Rupture time
h
Temperature / ℃ Stress / MPa
Sample 1 XY SRC 700 325 332
Sample 2 XY SRC 700 250 1201
Sample 3 Z SRC 700 325 712
Sample 4 Z SRC 700 250 2510
Sample 5 Z HT1 700 325 1012
Sample 6 Z HT2 700 325 1898
Sample 7 Z HT2 700 375 1143
Table 2  Influences of building orientation and heat treatment on the creep behavior of SLM-processed Inconel 718 alloy[48]
Fig.4  Planar slip feature of dislocations (a) and dislocation sheared precipitates (b) during creep deformation of Inconel 718 alloy
Fig.5  TEM image (a) and corresponding SAED pattern (b) for the creep induced twinning in Inconel 718 alloy, and its interaction with precipitates showed by the arrows (c)
Fig.6  HRTEM image (a) and corresponding FFT pattern (b) of γ" phase in Inconel 718 alloy, and the crystal model (c) for its D022 structure
Fig.7  Dislocation-sheared morphologyies of γ" (a) and γ′ (b) phases in Inconel 718 alloy
Alloy Cr Mo W Co Fe Nb Ti Al C P B Ni
718 18.1 2.9 - - 18 5.45 1.0 0.45 0.025 0.007 0.004 Bal.
718Plus 18.0 2.8 1 9 10 5.40 0.7 1.45 0.020 0.007 0.004 Bal.
Table 3  Nominal composition of Allvac 718Plus compared to Inconel 718 alloy[81]
(mass fraction / %)
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