Journal Of Metallurgical and Materials Engineering

Journal Of Metallurgical and Materials Engineering

Investigation of Strain Induced Precipitation of γ' Phase of AD730 Ni base Superalloy Using Stress Relaxation Technique

Document Type : Original Article

Authors
Zahra Mirzaie 1
Gholamreza Ebrahimi 2
Hamid Reza Ezatpour 3
1 Department of Materials and Polymers Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.
2 Department of Materials Science and Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
3 Department of Materials Engineering, Valieasr University of Rafsanjan, Rafsanjan, Iran
10.22067/jmme.2025.92945.1203
Abstract
In the present work, the effect of deformation on the precipitation of the γʹ -phase in the as cast nickel-based superalloy of AD730 is investigated in the temperature range of 950-1050 °C and strain rate of 0.1 s-1, using the stress relaxation technique. It is indicated that γ´ precipitation leads to a slope change in the stress relaxation curves as a result of retardation of the stress relaxation in AD730. The precipitation-time-temperature (PTT) diagram shows that with increasing the test temperature from 950 ℃ to 1000 °C, the start time of precipitation decreases and then increases until the temperature of 1050 °C, which confirms the effect of temperature on the precipitation kinetics of γʹ phase. Microstructural studies designate that by increasing test temperature and duration time at constant strain, the size of γʹ precipitates increases with two mechanisms of agglomeration and competitive growth. The slope change at the end of the relaxation curves indicates that these precipitations play no role in strengthening as a result of the increase of softening work.
Keywords
AD730 Ni base superalloy
Dynamic precipitation
Stress relaxation test
γʹ precipitation
Subjects
[1]    T. Konkova, S. Rahimi, S. Mironov, and T. Baker, "Effect of strain level on the evolution of microstructure in a recently developed AD730 nickel based superalloy during hot forging," Materials Characterization, vol. 139, pp. 437-445, 2018. https://doi.org/10.1016/j.matchar.2018.03.027 
[2]    A. Coyne-Grell, J. Blaizot, S. Rahimi, I. Violatos, S. Nouveau, C. Dumont, A. Nicolaÿ, and N. Bozzolo, "Evolution of γ′ precipitation during the early stages of industrial forging of a nickel-based superalloy," Metallurgical and Materials Transactions A, vol. 54, no. 5, pp. 2022-2036, 2023. https://doi.org/10.1007/s11661-022-06878-w 
[3]    F. Masoumi, M. Jahazi, J. Cormier, and D. Shahriari, "Dissolution kinetics and morphological changes of γ′ in AD730TM superalloy," in MATEC Web of Conferences, 2014, vol. 14: EDP Sciences, p. 13005. https://doi.org/10.1051/matecconf/20141413005
[4]    A. Devaux, L. Berglin, L. Thebaud, R. Delattre, C. Crozet, and O. Nodin, "Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730TM," MATEC Web of Conferences, vol. 14, p. 01004, 2014. https://doi.org/10.1051/matecconf/20141401004 
[5]    J. Blaizot, L. Finet, A. Chabrier, A. Fornara, M. Fage, R. Remichi, M. Dadé, and M. Perez, "Gamma Prime Precipitation in Cast and Wrought AD730® Superalloy," in International Symposium on Superalloys, 2024: Springer, pp. 762-773. https://doi.org/10.1007/978-3-031-63937-1_72
[6]    Q. Zhou, T. An, K. Zhang, C. Zhou, H. Qian, D. Ying, Y. Li, and L. Zhang, "Effect of microstructure on hot corrosion behavior of new superalloy Ad 730 in 75 wt% Na2SO4+ 25 wt% NaCl molten salt," Materials Letters, vol. 341, p. 134231, 2023. https://doi.org/10.1016/j.matlet.2023.134231 
[7]    S. Tabaie, F. Rézaï-Aria, B. C. Flipo, and M. Jahazi, "Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™," Materials Characterization, vol. 171, p. 110766, 2021. https://doi.org/10.1016/j.matchar.2020.110766
[8]    A. Devaux, B. Picqué, M. F. Gervais, E. Georges, T. Poulain, and P. Héritier, “AD730™–A new nickel-based superalloy for high temperature engine rotative parts,” in Superalloys 2012, TMS, pp. 911–919, 2012. https://doi.org/10.7449/2012/Superalloys_2012_911_919
[9]    A. Devaux, E. Georges, and P. Héritier, "Development of New C&W Superalloys for High Temperature Disk Applications," Advanced Materials Research, vol. 278, pp. 405-410, 2011. https://doi.org/10.4028/www.scientific.net/AMR.278.405 
[10]  F. Masoumi, M. Jahazi, D. Shahriari, and J. Cormier, "Coarsening and dissolution of γ′ precipitates during solution treatment of AD730™ Ni-based superalloy: Mechanisms and kinetics models," Journal of Alloys and Compounds, vol. 658, pp. 981-995, 2016. http://dx.doi.org/10.1016/j.jallcom.2015.11.002 
[11]  A. Devaux, A. Helstroffer, J. Cormier, P. Villechaise, J. Douin, M. Hantcherli, and F. Pettinari-Sturmel, "Effect of Aging Heat-Treatment on Mechanical Properties of AD730™ Superalloy," in 8th International Symposium on Superalloy 718 and Derivatives: John Wiley & Sons, Inc., 2014, pp. 521-535.
[12]  A. Coyne-Grell, M. Pérez, I. Violatos, J. Blaizot, C. Dumont, and S. Nouveau, "Precipitation of γ′ in Two γ-γ′ Ni-Based Superalloys During the Solvus Transition Stage of Ingot to Billet Conversion: Effects on γ Grain Structure and Implications for Open Die Forging," in International Symposium on Superalloys, 2024: Springer, pp. 727-740. https://doi.org/10.1007/978-3-031-63937-1_69
[13]  W. J. Liu and J. J. Jonas, "Nucleation kinetics of Ti carbonitride in microalloyed austenite," Metallurgical transactions A, vol. 20, no. 4, pp. 689-697, 1989. https://doi.org/10.1007/BF02667586 
[14]  J. Beddoes, "Prediction of creep properties for two nickel-base superalloys from stress relaxation testing," The Journal of Strain Analysis for Engineering Design, vol. 46, no. 6, pp. 416-427, 2011. https://doi.org/10.1177/0309324711407707  
[15]  G. R. Ebrahimi, A. Momeni, M. Jahazi, and P. Bocher, "Dynamic recrystallization and precipitation in 13Cr super-martensitic stainless steels," Metallurgical and Materials Transactions A, vol. 45, no. 4, pp. 2219-2231, 2014. https://doi.org/10.1007/s11661-013-2119-7 
[16]  Z. Zhu, L.-W. Zhang, and S. Gu, "Stress relaxation test of Hastelloy C-276 alloy and its creep constitutive equation," The Chinese Journal of Nonferrous Metals, vol. 22, no. 4, pp. 1063-1067, 2012.  
[17]  J. Calvo, M. Penalva, and J. M. Cabrera, "Characterization of strain-induced precipitation in Inconel 718 superalloy," Journal of Materials Engineering and Performance, vol. 25, pp. 3409-3417, 2016. https://doi.org/10.1007/s11665-016-2154-9 
[18]  M. Mirzaee, A. Khodabade, H. Najafi, and G. R. Ebrahimi, "Investigation of gamma precipitation process under effect of strain in Nimonic80A nickel base superalloy," journal of New Materials, vol. 12, no. 43, pp. 36-55, 2021. https://dx.doi.org/10.30495/jnm.2021.4677 
[19]  H. Monajati, F. Zarandi, M. Jahazi, and S. Yue, "Strain induced γ′ precipitation in nickel base superalloy Udimet 720 using a stress relaxation based technique," Scripta Materialia, vol. 52, no. 8, pp. 771-776, 2005. https://doi.org/10.1016/j.scriptamat.2004.12.006  
[20]  H. Monajati, A. Taheri, M. Jahazi, and S. Yue, "Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy," Metallurgical and Materials Transactions A, vol. 36, no. 4, pp. 895-905, 2005. https://doi.org/10.1007/s11661-005-0284-z  
[21]  X.-p. Wei, W.-j. Zheng, Z.-g. Song, T. Lei, Q.-l. Yong, and Q.-c. Xie, "Strain-induced Precipitation Behavior of δ Phase in Inconel 718 Alloy," Journal of Iron and Steel Research, International, vol. 21, no. 3, pp. 375-381, 2014. https://doi.org/10.1016/S1006-706X(14)60058-3  
[22]  N. Mrozowski, G. Hénaff, F. Hamon, A.-L. Rouffié, J.-M. Franchet, J. Cormier, and P. Villechaise, "Aging of γ′ precipitates at 750° C in the nickel-based superalloy AD730TM: a thermally or thermo-mechanically controlled process?," Metals, vol. 10, no. 4, p. 426, 2020. https://doi.org/10.3390/met10040426  
[23]  Z. Mirzaie, G. R. Ebrahimi, H. Ezatpour, and S. Ali Akbari Sani, "Hot Deformation Behavior and Development of Constitutive Equations on a Novel γ-γ/Ni-base Superalloy: AD730," Iranian Journal of Materials Forming, vol. 8, no. 3, pp. 4-17, 2021.
[24]  L. Li, E. Sun, and S. Tin, "Microstructure dependence of stress relaxation behavior of powder-processed Ni‐base superalloys," Materials Science and Engineering: A, vol. 814, p. 141146, 2021. https://doi.org/10.1016/j.msea.2021.141146  
[25]  H. Wang, F. Fei, S. Liu, J. Li, R. Tong, S. Yang, and L. Song, "Effect of temperature on the stress relaxation behavior of the powder metallurgy superalloy FGH96," Materials Today Communications, vol. 43, p. 111736, 2025. https://doi.org/10.1016/j.mtcomm.2025.111736  
[26]  A. Harte, M. Atkinson, A. Smith, C. Drouven, S. Zaefferer, J. Quinta da Fonseca, and M. Preuss, "The effect of solid solution and gamma prime on the deformation modes in Ni-based superalloys," Acta Materialia, vol. 194, pp. 257-275, 2020. https://doi.org/10.1016/j.actamat.2020.04.004  
[27]  M. M. Barjesteh, S. M. Abbasi, K. Z. Madar, and K. Shirvani, "The effect of heat treatment on characteristics of the gamma prime phase and hardness of the nickel-based superalloy Rene® 80," Materials Chemistry and Physics, vol. 227, pp. 46-55, 2019. https://doi.org/10.1016/j.matchemphys.2019.01.038  
[28]  R. Sharghi-Moshatghin and S. Asgari, "The effect of thermal exposure on the γ′ characteristics in a Ni-base superalloy," Journal of Alloys and Compounds, vol. 368, no. 1-2, pp. 144-151, 2004. https://doi.org/10.1016/S0925-8388(03)00699-6  
[29]  Y. Wu, C. Li, X. Xia, H. Liang, Q. Qi, and Y. Liu, "Precipitate coarsening and its effects on the hot deformation behavior of the recently developed γ'-strengthened superalloys," Journal of Materials Science & Technology, vol. 67, pp. 95-104, 2021. https://doi.org/10.1016/j.jmst.2020.06.025  
[30]  L. Ge, X. N. Zhang, W. G. Guo, P. Dong, T. Yu, C. P. Liu, Y. Yuan, C. Y. Wang, and Z. Zhang, "The coarsening behavior of γ′ phases in Ni-Al binary model single crystal superalloy at 1000 °C," Journal of Alloys and Compounds, vol. 911, p. 164989, 2022. https://doi.org/10.1016/j.jallcom.2022.164989  
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