Microstructure Evolution Behavior of Powder Superalloy FGH4720Li at Near Service Temperature
Received date: 2021-04-07
Revised date: 2021-05-22
Online published: 2021-09-03
Supported by
National Science and Technology Major Project(2017-VI-0017-0089);National Natural Science Foundation of China(51771017)
GH4720Li is used for turbine disks in a large number of civil and military propulsion systems because of its excellent mechanical properties and corrosion resistance. GH4720Li turbine disk is mainly manufactured through cast and wrought conventionally, but the addition of a high mass fraction of Ti, Al, and Mo can cause severe element segregation and more difficult microstructure control, which can become more severe as the turbine disk gets larger. Owing to this difficulty, the turbine disk quality cannot be guaranteed if the GH4720Li turbine disk is still in cast and wrought form, and the manufacturing process will be more complex, resulting in increased costs. However, the powder metallurgy method can efficiently eliminate element segregation and produce a more uniform microstructure than the cast and wrought methods. GH4720Li alloys manufactured using the powder metallurgy method are called FGH4720Li alloys. As there has been limited research on FGH4720Li and no report on the microstructure evolution during long-term ageing for FGH4720Li to date, it is necessary to study the microstructure evolution behavior during long-term ageing for FGH4720Li to obtain improved microstructure stability. In this study, field emission scanning electron microscopy and extractive phase analysis were used to investigate the microstructure evolution of FGH4720Li in the temperature range of 600-730oC up to 3000 h. The results showed that primary gamma prime was the most stable; whereas, secondary and tertiary gamma prime microstructure evolutions were comparatively complex. At 600oC, there was no microstructure change. At 650oC, only the tertiary gamma prime grew, but there was no microstructure change for the other gamma primes up to 3000 h. When the ageing temperature increased to 730oC, the tertiary gamma prime grew faster before coarsening rapidly. After 200 h, the secondary gamma prime coarsened noticeably, but the big secondary gamma prime coarsened by Ostwald ripening first, absorbing a large amount of tertiary gamma prime and splitting up between 300 and 500 h, before ageing with further processing. Big secondary gamma prime mainly coarsens by amalgamation; whereas, small secondary gamma prime always coarsens by amalgamation during ageing. The divergence between these two types of secondary gamma prime is related to the distribution characteristics of the tertiary gamma prime.
Chao LIU , Zhihao YAO , Jing GUO , Zichao PENG , He JIANG , Jianxin DONG . Microstructure Evolution Behavior of Powder Superalloy FGH4720Li at Near Service Temperature[J]. Acta Metall Sin, 2021 , 57(12) : 1549 -1558 . DOI: 10.11900/0412.1961.2021.00140
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