Effect Of Heat Treatment On Microstructures And Properties Of GH4169 Alloy Formed By The Technology Of Laser Rapid Forming Combined With Continuous Point Forging

The yield strength of GH4169 nickel-base superalloy is not only the bast in wrought superalloy below 650? but also it contains good plasticity,fatigue resistance,oxidation resistance,corrosion resistance,processiong performance and long-term tissue stability,so it is called one of the highly versatile superalloy.Laser Rapid Forming(LRF)is an advanced manufacturing and repair metal parts forming technology,but this technology is still insufficient.The mechanical properties of Laser Rapid Forming GH4169 alloy is lower than the standard mechanical properties of nickel-base superalloy forgings.This article combined the Consecutive Point-mode Forging with Laser Rapidly Forming technology,which brings the non-equilibrium microstructure by Laser Rapid Forming GH4169 alloy about plastic deformation.Then Through the heat treatment,the non-equilibrium microstructure by Laser Rapid Forming transformed to the microstructure by forging.Investigated on the effect of different heat treatment system on microstructure and properties of Consecutive Point-mode Forging and Laser Rapidly Forming(CPF-LRF)Process forming GH4169 alloy.Results show that with the increase of annealing temperature,the equiaxial crystal grain size is more and more big,the mechanical performance is getting better and better,to achieve and exceed standard mechanical properties of alloy forgings GH4169 was investigated.Compared the microstructure and properties of Laser Rapid Forming GH4169 alloy with Consecutive Point-mode Forging and Laser Rapidly Forming(CPF-LRF)Process forming GH4169 alloy,we found that the microstructure and properties of latter are greatly improved.The influences on globularization behavior of GH4169 alloy with the Laser Rapid Forming and Consecutive Point-mode Forging and Laser Rapidly Forming(CPF-LRF)Process forming in different annealing temperature and deformation,were researched by quantitative metallographic observation,scanning electron microscopes,microhardness and micro tensile.Also research the influence on location and amount of precipitation brittle phase Laves,strengthening phase ?,??,? ?.The results show that the higher annealing temperature within a certain scope,increasing plastic deformation are conducive to the globularization of recrystallization grain size.