What is the Machining Performance of GH4049 (GH49) Nickel-based Alloy
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What is GH4049 (GH49) nickel base alloy?
GH4049 is a nickel-based superalloy, which is an age-hardening alloy. The
corresponding grade is GH49. Its nickel content is about 70%. After the alloy is
remelted by electroslag or vacuum arc, its processing plasticity can be
improved. GH4049 superalloy has good hot and cold working properties. The alloy
has good oxidation resistance below 1000 °C high temperature environment, high
high temperature strength below 950 °C, small notch sensitivity, good oxidation
resistance and fatigue strength. , poor single hot working plasticity
Main processing properties of GH4049 (GH49) nickel-based alloy
Compared with nickel-based alloys of the same kind, GH4049 superalloy has
poor hot working plasticity. It is suitable for making gas turbine working
blades with a working temperature of 850-950 °C. It is mainly used to make
turbine blades for aviation, naval and industrial gas turbines. ,
high-temperature components such as guide vanes, turbine disks, high-pressure
compressor disks and combustion chambers; also used in the manufacture of space
vehicles, rocket engines, nuclear reactors, petrochemical equipment, and coal
conversion and other energy conversion devices.
The nano-surface crystal layer was prepared on the surface of GH4049
nickel-based superalloy by the treatment process. The effects of different
ultrasonic shot peening intensity and shot peening time on its yield strength,
tensile strength and microhardness were analyzed. Residual stress distribution
of the specimen after nanoization. The research results show that the increase
of shot peening time has no direct relationship with the improvement of material
strength, and with the increase of shot peening time, the strength of the
material will decrease due to the damage of the material surface. After
ultrasonic shot peening, the microhardness was significantly improved compared
with that of the untreated specimen, and a compressive stress layer of about
thickness was formed on the surface of the specimen, and the large compressive
stress far exceeded the yield limit of the material.
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The World Food Program (WFP) of the United Nations (UN) and the European Union (EU) said in a statement that the conflict between Russia and Ukraine poses risks to global food supplies, and called on the international community to increase support for vulnerable countries and jointly address food security challenges.
A few days ago, the Executive director of the World Food Program, the European Commission's commissioner in charge of crisis management, the French Foreign Minister of the ROTATING EU presidency, and other officials held a meeting in Rome, Italy, to discuss how to deal with the negative impact of the Conflict between Russia and Ukraine on global food security.
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