In order to obtain a homogeneous fine-grained microstructure,multiple cumulative deformation test for GH4730 alloy were carried out.The microstructure of the alloy after multiple cumulative deformations was analyzed by means of OM,SEM and EBSD.The results reveal that the proportion of recrystallisation gradually increases and the size and number of unrecrystallised grains gradually decrease as the deformation times and amount increase.The recrystallisation mechanism is dominated by discontinuous dynamic recrystallisation(DDRX),supplemented by continuous dynamic recrystallisation(CDRX).The DDRX occurs mainly between the hard oriented grains,and the Taylor factor of the residual unrecrystallised grains is generally larger.There is a large amount of fine coherent γ'phase in the unrecrystallised microstructure.As the deformation times and amount increase,the primary y'phase becomes progressively coarser,with a significantly larger area fraction and a significantly smaller number of secondary γ'phases.
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