| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
|---|
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Audited Supplier K406 cast superalloy K6 master alloy rod (US: GMR-235D)
K406 Overview: K406 Cast Superalloy
Executive standard: GB/T14992-2005
K406 cast alloy features:
K406 is a nickel-based casting alloy, the master alloy is smelted by vacuum, and the blades are cast by vacuum remelting.
K406 alloy has good thermal strength and process performance, it can be used as a casting alloy material to replace deformed material GH4307.
K406 has good resistance to high temperature oxidation and heat corrosion resistance, and has good casting process performance and welding process performance.
K406 (US: GMR-235D)
K406 chemical composition%
C: 0.10-0.20
Cr: 14.0-17.0
Ni: margin
Mo: 4.50-6.0
Al: 3.25-4.0
Ti: 2.0-3.0
Fe: ≤1.0
B: 0.05-0.10
Zr: 0.03-0.08
Mn: ≤0.10
Si: ≤0.30
P:≤0.02
S: 0.01
Physical properties of K406:
Density: 8.05 g/cm3
Melting point: 1260-1345ºC
Elastic modulus: 145-203GPa
Thermal conductivity: 13.82W/(m•ºC)
Hardness (HRC): 35-38
Thermal expansion coefficient (20-100°C): 11.82×10-6/°C
2. Main features: It has good resistance to high temperature oxidation and heat corrosion resistance, and has good casting process performance and welding process performance.
3. Application example: It is suitable for making gas turbine rotor blades and guide vanes and other high-temperature parts that work for a long time below 850 °C.
4. Varieties and specifications: master alloy bars, precision alloy bars, etc. are negotiated and supplied, and can be produced according to customer requirements.
Cast superalloy
The superalloy material for the direct preparation of parts by the casting method. According to the alloy matrix composition, it can be divided into three types: iron-based casting superalloy, nickel-based casting superalloy and drill-based casting superalloy. According to the crystallization method, it can be divided into four types: polycrystalline casting superalloy, directional solidification casting superalloy, directional eutectic casting superalloy and single crystal casting superalloy. The majority of cast superalloys are polycrystalline cast superalloys.
Features Cast superalloys have the following features:
(1) The degree of alloying is high. The γ' strengthening phase (see the intermetallic compound phase of the superalloy material) forms the elements aluminum, titanium, niobium, tantalum, etc. up to 16%, and also adds a certain amount of solid solution strengthening elements tungsten and molybdenum.
(2) The chromium content is relatively low, most of which are below 10%.
(3) The grain boundary strengthening element boron content is all O. 01% or more.
(4) Most of the carbon content exceeds o. 1%, and the carbon content of cobalt-based cast superalloys is as high as 1%. (5) Some cast superalloys add 1% to 2% hafnium to improve medium temperature plasticity and increase creep strength.
In the microstructure of the cast superalloy (see the microstructure of superalloy materials), in addition to the γ' phase, there is also a γ-γ' eutectic phase, and there are more primary carbide phases along the interdendritic crystals. distribution, and some alloys also have M3B2 boride precipitation. The heat treatment process of cast superalloys is relatively simple, and some can be used even without heat treatment.
Parts production Cast superalloys are generally smelted in a large vacuum induction furnace to smelt the master alloy, use the lost wax precision molding method to create the shell shape, and then remelt and cast the parts in a small vacuum induction furnace.
Defects and elimination There will inevitably be some microscopic porosity in castings, which can be reduced or eliminated by hot isostatic pressing to increase the reliability of the parts. The grain size of cast superalloy parts is relatively large, which is detrimental to fatigue performance. The surface grain refinement method is usually used to obtain fine grains on the surface of the part.
Development direction The use of directional solidification technology can produce columnar crystal blades without transverse grain boundaries or single crystal blades with complete elimination of grain boundaries, so that the high temperature fatigue life and lasting strength are doubled, which is the current development direction of casting superalloys.
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