Beneficial Properties of Nickel Alloy AMS 5663

Know about the beneficial properties of nickel-chromium alloy AMS 5663 for aerospace industry like super strength, perfect hardness, etc.

Nickel-chromium based superalloy AMS 5663 (designation of Inconel 718) is specifically suitable for use in extremely high temperature environments where corrosion, thermal shock and creep resistances are required. This alloy is excellent choice for aerospace manufacturing due to its super strength, perfect hardness and other favourable properties and features.

The True Super Nickel Based Alloy - AMS 5663 is considered as the true super nickel-chromium based alloy with the power to withstand the 600°C permanently. Its Young's modulus is about double than of Ti6Al4V (Grade 5 Titanium) and near to that of unalloyed carbon steel (CK 45). This superalloy owns better rupture and super strength with excellent resistance to corrosion and fatigue. It keeps toughness and strength over long period of time at extremely high temperatures with corrosion resistance.

AMS 5663 (Inconel 718) covers around 50% of the aircraft’s turbojet engines’ weight, being the chief component for discs, blades and casing of high pressure section of the compressor and discs as well as few blades of turbine section. It also has few applications in rocket engines and cryogenic environments as it has better toughness at low temperature (saving parts from brittle fracture).

AMS 5663 (Inconel 718) highly contains iron which cut its cost per kilogram while offering it a precipitation hardening effect. In the matrix, iron’s low mobility gives the prime strengthening phase (γ’’) a slow precipitation kinetics that decrease susceptibility to post-weld cracking. Inconel 718 is created to overcome the low joinability of this class of materials, usually extra sensitive to crevices (microstructural segregation of alloying elements in heat affected zone of welds).

Few alloying elements offer AMS 5663 an extreme corrosion resistance up to 1000°C / 1832°F. For instance, nickel is useful in combating with chloride stress corrosion cracking (CLSCC) and saves from corrosion in various organic and inorganic oxidizing compounds, in a huge range of acidity and alkalinity. Chromium provides this super alloy the ability to withstand the attacks from sulfur compounds and oxidizing media while chemical element Molybdenum assist in improving resistance to pitting corrosion.

Two strengthening modes are joined: solid solution hardening (atoms of niobium, molybdenum, chromium and iron can substitute to nickel in the metallic matrix) and hardening by precipitation of ordered intermetallic phases, γ' and γ'’. Precipitation of intermetallic phase γ', Ni3(Ti, Al), forms aluminium and titanium, which are re-hardenable and metastable from solid solutions of titanium and niobium (at normal room temperature) and tungsten or molybdenum (at extreme high temperatures). At temperature near to 650°C, niobium combines with Nickel through precipitation the γ'' phase (Ni3Nb), which owns high mechanical properties at moderately very high and very low temperatures. Although γ’’ and γ´ are existing in aged condition, the amount of γ´ is very tiny and γ’’ is considered as the main strengthening agent. The precipitates of γ'' are in shape of disc, with the thickness of 5-9 nm and average diameter of about 60 nm.

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