The invention belongs to the technical field of
alloy manufacturing, particularly relates to a GH4751
alloy high-performance hot-rolled material and a manufacturing method thereof, and aims to solve the problems of serious composition segregation, grain coarsening and low
processing energy efficiency in the prior art. According to the method, a high-purity
electrode bar is prepared through a duplex process of
vacuum induction melting and electroslag remelting,
forging cogging (finish
forging at the temperature of 1100-1200 DEG C) and multi-pass
temperature control rolling (single-pass deformation is 20-30%, and the finish rolling temperature is 900-950 DEG C) are combined, two-stage aging treatment (840 DEG C * 24h + 700 DEG C * 2h) is assisted, and gamma'strengthening phase uniform
precipitation and grain refinement are achieved. The room-temperature tensile strength of the hot-rolled material prepared by the method is greater than or equal to 1176MPa, the grain size is greater than or equal to grade 7, and the yield is improved to 90% or above. According to the invention, the inversion relationship between the strength and the
plasticity of the traditional process is broken through, a GH4751
alloy material which is directly used without surfacing is provided for high-temperature parts such as an engine air valve, the
processing cost is obviously reduced, and the service life of the parts is prolonged.