Effect of secondary solution and aging treatment on microstructure and properties of K4648 nickel-based superalloy
Effect of secondary solution and aging treatment on microstructure and properties of K4648 nickel based superalloy was studied using scanning electron microscopy,energy dispersive spectroscopy and tensile testing.The results show that after secondary solution and aging treatment,larger needle like α-phase precipitates in the alloy,and the size of M23C6 carbides decreases.As the secondary solution temperature increases,the needle like α-phase gradually coarsens,and the number of M23C6 increases,with most of it continuously distributed at grain boundaries.After secondary solution and aging treatment,the tensile strength of the alloy is significantly improved,while the plasticity slightly decreases.The optimal secondary solution temperature for the K4648 alloy is 1200 ℃.At this time,the tensile strength of the alloy reaches 810 MPa,which is about 39％higher than that of the primary solution and aging treatment,and the elongation slightly decreases from 17.2％to 15.3％.
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