What is Main Application of K403 Alloy

(What is Main Application of K403 Alloy)

K403 alloy is widely used as turbine working blades below 900 °C and guide
blades below 1000 °C. It has been used in 16 domestic engines as blade
materials. It is the most widely used casting superalloy in my country.

Compared with iron-based and cobalt-based superalloys, nickel-based
superalloys have higher working temperature, less harmful phases, stable
structure, and greater resistance to oxidation and thermal corrosion.

It is known as the "heart of the engine". At present, nickel-based alloys
have accounted for half of the total weight of advanced engines, and the turbine
blades, combustion chambers and compressor blades of the turbine disk on
aircraft have also begun to be used. F. The many advantages of nickel-based
alloys are inseparable from the advantages of pure nickel itself. First, as a
face-centered cubic structure of nickel, the structure is stable, and there is
no allotropic transformation. Second, it has high chemical stability and is not
easy to be oxidized.

In addition, although the mechanical properties of pure nickel are not high,
it has good plasticity at low temperature. Basically, it does not change, and it
is particularly important that it has good alloying ability, and there is
basically no harmful phase when other elements are added, which provides
potential feasibility for changing various chemical and mechanical properties of
nickel. 9]. Nickel-based superalloys are generally divided into nickel-based
single crystal superalloys, polycrystalline superalloys and directionally
solidified superalloys. Nickel-based single crystal superalloy is a new type of
material researched by a few developed countries using single crystal
technology.

It is characterized by no grain boundary, no high temperature grain boundary
weakening and longitudinal grain boundary cracks and other defects, and its
alloying does not need to add grain boundary strengthening elements. , the
composition is simple, the initial melting temperature of the alloy is greatly
improved, and it has excellent high-temperature performance. Compared with cast
and directionally solidified superalloys, it has higher mechanical properties,
thermal fatigue properties, and oxidation and creep resistance. It is an
indispensable material for the manufacture of aero-engine and gas turbine
blades.

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(What is Main Application of K403 Alloy)