Overview of the characteristics and application fields of GH4080A alloy steel: GH4080A uses nickel-chromium as the alloy matrix, and adds aluminum and titanium to form a γ' phase dispersion-strengthened alloy. Oxidative. The alloy has good cold and hot processing properties, and is mainly used for hot-rolled bars and disc blanks, which are used in engine rotor parts.
Chemical composition of GH4080A alloy steel: Executive standard: (GB/T14992-2005)
Nickel Ni: surplus
Chromium Cr: 19~22
Iron Fe: 4.0
Carbon C: 0.03~0.08
Manganese Mn: ≤0.35
Silicon Si: ≤0.65
Sulfur S: ≤0.07
Phosphorus P: 0.15
Aluminum Al: 0.6 to 1.0
Titanium Ti: 2.4~2.8
GH4080A Alloy Steel "Product Physical Properties Table"
Density g/cm3: 8.2
Melting point °C: 11.3 (100 °C)
Thermal conductivity λ/(W/m?ºC): 439.6
Specific heat capacity J/kg?ºC: 221
Resistivity μΩ?m: 1.24
Linear expansion coefficient a/10-6ºC-1: 11.56 (20~100ºC)
Mechanical properties of GH4080A: (minimum value of mechanical properties detected at 20°C)
Heat treatment method: solution treatment
Tensile strength σb/MPa: 880
Yield strength σp0.2/MPa: 590
Elongation σ5 /%: 13
Brinell hardness HBS: ≤321
GH4080A Metallographic structure: The alloy is a single-phase austenite structure in the solid solution state, with trace amounts of TiC, TIN[Ti(C, N).
GH4080A process performance and requirements:
1. The alloy has good hot working performance, the forging heating temperature is 1140ºC, and the final forging is 950ºC.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The alloy can be welded by argon arc welding in the solid solution state, and it should be treated in time after welding to eliminate welding stress.
4. Surface treatment process: The machined parts need to be electropolished. If mechanical polishing is used, the final polishing scratch should be consistent with the length of the blade.
5. The heating rate of the part solution treatment should not be too fast, and a stepped heating curve can be used.,
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