Hot Deformation Characteristics of Novel Wrought Superalloy GH4975 Extruded Rod Used for 850 ℃ Turbine Disc
Received date: 2020-03-04
Revised date: 2020-04-06
Online published: 2020-06-17
Supported by
Preparatory Studies Fund Project(9140C4302XX)
With the development of aero-engine in the direction of high thrust ratio, high efficiency and high reliability, the indicators of temperature resistance of cast & wrought superalloys are getting higher and higher. For the demand of aero-engine, the wrought superalloy materials used for aero engine turbine disc have been made remarkable progress. Form heat-resistant steel which temperature capability reaches 550 ℃ to iron-nickel based superalloy used at 650 ℃, and the high alloyed wrought superalloy with service temperature of 750 ℃ have been developed. The nickel-based wrought superalloy GH4975 is a high strength, complex alloying, hard-deformed wrought turbine disc alloy, which can be used at 850 ℃. In the study, the thermal deformation behavior of GH4975 extruded rod prepared by vacuum induction melting (VIM) and vacuum arc remelting (VAR) was studied by thermal simulation machine with the temperature range of 1070~1220 ℃ and strain rate range of 0.001~1 s-1. The results show that the stress-strain curves of GH4975 alloy are divided into three stages: strain hardening, flow softening and steady state rheology, exhibiting typical dynamic recrystallization characteristics. The constitutive equation of GH4975 extruded rod was established and the hot deformation activation energy was calculated as 664587 J/mol. Besides, the processing maps of GH4975 alloy were drawn based on the dynamic material model (DMM), and the suitable processing parameters are determined by combining with microstructure observation. The dynamic recrystallization easily occurs at the deformation temperature range of 1100~1130 ℃, and the nucleation mechanisms were elaborated to be strain inducing grain boundary.
Yong ZHANG , Xinxu LI , Kang WEI , Zhipeng WAN , Chonglin JIA , Tao WANG , Zhao LI , Yu SUN , Hongyan LIANG . Hot Deformation Characteristics of Novel Wrought Superalloy GH4975 Extruded Rod Used for 850 ℃ Turbine Disc[J]. Acta Metall Sin, 2020 , 56(10) : 1401 -1410 . DOI: 10.11900/0412.1961.2020.00074
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