Effect of Different Microstructures on the Impact Toughness of GH4698
The microstructure analysis of the low impact energy of GH4698 alloy in impact test was systematically carried out.Through the detailed study of the impact fracture,grain size,carbide and precipitation strengthening phase γ',the results show that the influence of the precipitation strengthening phase γ'relative to the impact energy of the material is particularly significant.Specifically,the γ'phase,which is a hard precipitated phase,can effectively hinder the slippage of dislocations during the deformation of materials.When the dislocation moves in the crystal and encounters these γ'phase particles,pinning occurs,which increases the difficulty of the dislocation movement,thereby enhancing the deformation resistance of the material,which in turn affects the impact energy level of the material.It is found that when the precipitation of the γ' phase in GH4698 alloy is insufficient,the impact energy of the material will be significantly reduced.Therefore,optimizing the precipitation and distribution characteristics of γ' phase will be an important research direction to improve the impact performance of GH4698 alloy.In addition,although the grain morphology,carbide distribution and content have a certain influence on the impact energy of the material,the influence on the impact energy is relatively small.
万方数据
维普
