GH4350(AEREX 350)is a Ni-based wrought superalloy for high-performance fasteners,with a maximum service temperature of 750℃.It has high tensile strength,fatigue resistance,stress rupture and relaxation resistance,cor...GH4350(AEREX 350)is a Ni-based wrought superalloy for high-performance fasteners,with a maximum service temperature of 750℃.It has high tensile strength,fatigue resistance,stress rupture and relaxation resistance,corrosion resistance,low thermal expansion,and notch sensitivity.The high strength of GH4350 is largely derived through solid solution strengthening and the γ′phase precipitation strengthening.During the precipitation of γ′phase,a minor amount ofηphase also precipitates.However,it is reported that the microstructure of alloy is sensitive to heat treatment parameters,including temperature and time.The γ′phases can be transformed intoηphases under certain conditions,potentially degrading the performance of the alloy.The chemical composition characteristics,heat treatment strategies,and strengthening mechanism of GH4350 were reviewed in this research,aiming to understand the factors behind its remarkable high-temperature performance,to guide the development of new alloys,and to further enhance its heat resistance.展开更多
The recent progress and future prospects for ultra-centrifugal sedimentation in solids are described,mainly involving equipment,miscible systems and compounds.Almost 90%ultracentrifugation experiments were performed o...The recent progress and future prospects for ultra-centrifugal sedimentation in solids are described,mainly involving equipment,miscible systems and compounds.Almost 90%ultracentrifugation experiments were performed on the 1st and 2nd high-temperature ultracentrifuge which is typically operated at temperatures below 500℃ under the maximum centrifugal acceleration up to 106 g.The strong gravitational and temperature fields induce atomic-scale graded structure,grain growth and refinement,and voids accumulation caused by the atomic sedimentation in miscible systems.New structures,properties and substances are produced in some compounds.A new cantilever high-temperature ultracentrifuge with a test temperature up to 1200℃ is under construction at Zhejiang University,making it possible to simulate the composition,microstructure and property evolution of superalloys in the operating environment of aircraft engines.展开更多
文摘GH4350(AEREX 350)is a Ni-based wrought superalloy for high-performance fasteners,with a maximum service temperature of 750℃.It has high tensile strength,fatigue resistance,stress rupture and relaxation resistance,corrosion resistance,low thermal expansion,and notch sensitivity.The high strength of GH4350 is largely derived through solid solution strengthening and the γ′phase precipitation strengthening.During the precipitation of γ′phase,a minor amount ofηphase also precipitates.However,it is reported that the microstructure of alloy is sensitive to heat treatment parameters,including temperature and time.The γ′phases can be transformed intoηphases under certain conditions,potentially degrading the performance of the alloy.The chemical composition characteristics,heat treatment strategies,and strengthening mechanism of GH4350 were reviewed in this research,aiming to understand the factors behind its remarkable high-temperature performance,to guide the development of new alloys,and to further enhance its heat resistance.
基金National Natural Science Foundation of China(51988101)Fundamental Research Funds for the Central Universities(226-2022-00050)。
文摘The recent progress and future prospects for ultra-centrifugal sedimentation in solids are described,mainly involving equipment,miscible systems and compounds.Almost 90%ultracentrifugation experiments were performed on the 1st and 2nd high-temperature ultracentrifuge which is typically operated at temperatures below 500℃ under the maximum centrifugal acceleration up to 106 g.The strong gravitational and temperature fields induce atomic-scale graded structure,grain growth and refinement,and voids accumulation caused by the atomic sedimentation in miscible systems.New structures,properties and substances are produced in some compounds.A new cantilever high-temperature ultracentrifuge with a test temperature up to 1200℃ is under construction at Zhejiang University,making it possible to simulate the composition,microstructure and property evolution of superalloys in the operating environment of aircraft engines.
