| Application: | Industrial |
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| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier Overview of K424 (K24)
K424 is a high AI, Ti, low-density nickel-based casting alloy with high high temperature strength, plasticity and good manufacturability. The alloy is usually used in the as-cast state, but in order to reduce the degree of dendrite segregation and improve the overall performance of the alloy, solid solution treatment can also be used. The saturation of the alloy is high, and when it is used for a long time at around 850 C, there is a tendency to precipitate a phase . However, it is sensitive to the size of the parts, and the precipitation of σ phase can be reduced and delayed by controlling the alloy composition and smelting process parameters and adopting the thin-wall size. The alloy is suitable for components such as turbine rotor blades operating at 950 C, integrally cast turbines, and engine exhaust trim plates.
Material grade K424 (K24).
Similar grades B pressure JI-12V', BXJI-129 (Russia).
Material technical standard Q/GYB501-1998 "Casting High Temperature K24 Master Alloy" (General Steel Research Institute).
Chemical composition of K424(K24) alloy
C: 0.14-0.20
Cr: 8.50-10.50
Ni: margin
Co: 12-.0-15.0
W: 1.0-1.80
Mo: 2.70-3.40
A1: 5.0-5.70
Ti: 4.20-4.70
Nb: 0.50-1.0
Fe: ≤2.0
V: 0.50-1.0
B: 0.015
Zr: 0.02
Ce: 0.02
Mn: ≤0.40
Si: ≤0.40
P:≤0.015
S:≤0.015
Heat treatment system Use as-cast, or 1210C±10C, 4h, air cooling.
Variety, Specification and Supply Status Master alloy ingots with a diameter of 70-90mm are supplied as-cast; finished parts and components shall be supplied according to the supply status agreed upon by both parties.
Melting and casting process The master alloy is smelted in a vacuum induction furnace, and the investment precision castings and samples are remelted and poured in the vacuum induction furnace.
Application overview and special requirements This alloy has been used to make the bottom plate of an aero-engine tail nozzle, and it is used in several important parts of the aerospace engine. Similar to it (Russian) BKJ1-12Y alloy has been used in dry AJI-31φ, P33, P29 and φC-1 engines as I-class turbine blades, tail spray adjusting plate bottom plate and integral casting turbine rotors and other components.
Microstructure Phase transition temperature
Time-Temperature-Tissue Transformation Curve
Alloy Microstructure The as-cast alloy is composed of: Y, Y', eutectic (Y-Y'), MC and a small amount of M, B2. During long-term aging at 850 °C, M23C is removed. In addition, a phase is also precipitated, and the size of its precipitation tendency is related to the average electron vacancy number Nv of the alloy and the size of the casting. When Nv≥2.7, a large amount of σ phase is precipitated, and when Ny≤2.28, no σ phase is precipitated.
Process performance and requirements
Forming performance The investment casting method can be used to cast complex thin-walled hollow blades, integrally cast turbines and adjusting pieces with uneven thickness.
Welding performance Due to the high content of aluminum and titanium, the welding performance of the alloy is poor.
Parts heat treatment process Parts are used in as-cast state or after "1210 C, 4h, air cooling" heat treatment.
Surface treatment process
Machining and grinding performance Carbide tools are used.
Detailed explanation of K424 equiaxed superalloy
Product name: equiaxed crystal casting superalloy
Product grade: K424
1. Introduction of K424 alloy
1. K424 is a nickel-based precipitation hardening equiaxed crystal casting superalloy. The operating temperature is less than 1000 ° C. The alloy is characterized by high content of aluminum and titanium elements and low density.
2. The alloy has high high temperature strength and plasticity, and good casting performance.
3. The alloy undergoes cyclic hardening in the process of low cycle fatigue at room temperature and 750 °C, and the stress resistance of the material increases gradually, and then tends to be stable.
4. When the alloy is used for a long time at around 850 ºC, there is a tendency to precipitate σ phase, but it is more sensitive to the size of the parts. The precipitation of o phase can be reduced and delayed by controlling the alloy composition and smelting process parameters and using thin wall size.
2. Material technical standards
GB/T 14992 Classification and designation of high temperature materials of superalloys and intermetallic compounds
GJB 5512.1 Specification for cast superalloy and cast intermetallic compound high temperature material master alloy
Cast superalloy master alloys for general precision castings
HB 7763 Specification for equiaxed grain cast superalloy ingots for aircraft engines
Heat treatment process of HB/Z 140 aviation superalloy
Q/GYB 05054 K424 alloy turbine rotor precision casting
Q/GYB 05055 K424 alloy low pressure turbine working wheel precision casting
Q/GYB 05056 K424 Alloy Guide I Precision Casting
3. Chemical composition
C: 0.14-0.20
Cr: 8.50-10.50
Ni: margin
Co: 12-.0-15.0
W: 1.0-1.80
Mo: 2.70-3.40
A1: 5.0-5.70
Ti: 4.20-4.70
Nb: 0.50-1.0
Fe: ≤2.0
V: 0.50-1.0
B: 0.015
Zr: 0.02
Ce: 0.02
Mn: ≤0.40
Si: ≤0.40
P:≤0.015
S:≤0.015
4. Melting and casting process
The master alloy is smelted in a vacuum induction furnace, remelted in a vacuum induction furnace, and the precision castings and test bars are cast by the investment casting method. 5. Variety Specifications and Supply Status
1. Main Specifications
The mother alloy is cast into a round long rod with a diameter ranging from 70mm to 90mm and a length of not less than 250mm.
2. Supply status
Master alloys are supplied as-cast, and precision castings are supplied as-cast or after heat treatment.
6. Mechanical properties
1. Density
7.87g/cm
2. Melting temperature range
1271ºC-1310ºC
7. Application Overview
The main products are precision casting structural parts such as turbine rotor blades, integrally cast turbine rotors and guides, and bottom plates of tail jets.
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