Crack propagation in GH4151 alloy during hot deformation

Abstract

Abstract: GH4151 alloy is a new type of nickel-base superalloy that is difficult to deform and can be used above 800 ℃. Due to the high alloying degree and large grain size of as-cast GH4151, it is easy to crack during hot deformation and can not be deformed such as cogging. The hot deformation behavior of GH4151 alloy at different temperatures and strain rates was investigated by the Gleeble-3500 thermal simulator. Electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM) were used to characterize the typical crack area, and the effects of grain orientation, recrystallization, low energy grain boundary, and solid solution phase on the crack propagation were analyzed. The results showed that the grains with 〈101〉 orientation can effectively hinder crack propagation compared with the grains of 〈001〉 and 〈111〉. The formation of recrystallized grains reduces the stress in the alloy, thereby reducing the crack growth rate. Low-energy grain boundaries have stronger resistance to crack propagation than random grain boundaries, and the greater the number of low-energy grain boundaries at the trifurcate grain boundary, the stronger the resistance effect. The crack propagation is promoted by the formation of a solid solution phase with brittle characteristics.

Key words: GH4151 alloy, thermal deformation, crack, extension mechanism

CLC Number:

TG306

LIU Jian-jun, WEI Bao-lin, JIA Zhi, DING Yu-tian. Crack propagation in GH4151 alloy during hot deformation[J]. Journal of Lanzhou University of Technology, 2023, 49(6): 28-32.

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