Inconel 706 is a titanium-stabilized fully austenitic nickel-iron-chromium alloy with additions of copper and molybdenum. Inconel706 overview:
Inconel 706 is a precipitation hardening alloy that provides high mechanical strength combined with outstanding machinability. This alloy features similar Inconel 718 except that Inconel 706 is easier to make, especially machined.
The main nickel and chromium content is oxidation and excellent corrosion resistance. The primary precipitation hardening components of this alloy are niobium and titanium. The aluminum content also contributes to the hardening reaction.
chemical composition:
Carbon C≤0.06
Silicon Si≤0.35
Manganese Mn≤0.35
Phosphorus P ≤0.02
Sulfur S≤0.015
Chromium Cr14.5-17.5
Nickel Ni39-44
Molybdenum Mo 1~1.6
Copper Cu ≤0.3
Fe balance
Niobium Nb 2.5-3.3
Boron B≤0.006
Titanium Ti1.5-2
Aluminum Al ≤0.4
Heat treatment system
Hot-rolled bars, forged bars, and forgings: 925-980°C, water cooling +845°C for 3 hours + 720 for 8 hours, cooling at 55°C per hour to 620°C for 8 hours, and cooling. HBS>285
Density: 8.06
Inconel 706
Inconel 706 alloy is a Fe-Ni-based superalloy, and the main second phases are γ' phase, γ'' phase, η phase and MC type carbide. Because Inconel 706 alloy has excellent castability, easy machinability and reliable high temperature mechanical properties, it is suitable for the preparation of oversized disc forgings with a diameter of more than 2000mm. At present, Inconel 706 alloy is mostly used as the main material for turbine disks of "E" and "F" class heavy-duty gas turbines in the world. The gh4169 alloy belongs to the "sister" alloy.
chemical composition
C: 0.030
Cr: 15.91
Ni: 42.13
Al: 0.24
Nb: 3.04
Ti: 1.83
Fe: surplus
Inconel 706 is used at 500°C, a widely used Fe-Ni-based superalloy. It has the characteristics of small segregation, excellent processing performance and low cost. It is widely used in turbine engines, gas turbines and nuclear industries. significance.
Dynamic recrystallization and grain control of Inconel 706 alloy: The uniform and refined grain structure can significantly improve the tensile properties, fatigue properties and nondestructive testing properties of the alloy. The effect of deformation on the microstructure of Inconel 706 alloy during hot deformation. On the one hand, the DRX (dynamic recrystallization) mechanism and critical conditions of GH4706 alloy are discussed to provide theoretical support for the physical model of numerical simulation. On the other hand, the use of η A new method for phase control of Inconel 706 alloy grains. the result shows:
(1) The DRX mechanism of Inconel 706 alloy is the discontinuous bowing of the original grain boundary induced by strain. When the critical temperature TDRX of DRX is 975 °C, the critical deformation depends on the deformation temperature and deformation heat generation. When the deformation temperature is lower than TDRX, the alloy occurs. The reason for DRX is the temperature rise of the sample caused by the heat generation of deformation;
(2) When the deformation temperature is higher than TDRX, the grain size of Inconel 706 alloy after heat treatment depends on the deformation temperature and has nothing to do with the amount of deformation; when the deformation temperature is lower than TDRX, the grain size after heat treatment has little relationship with the deformation temperature , decreases with the increase of deformation;
(3) Deformation at a temperature slightly lower than TDRX, since there is still a part of η phase remaining in the alloy, the pinning effect of this part of η relative to the subgrain boundary or grain boundary can be fully utilized, and Inconel 706 can be realized by increasing the deformation amount Alloy grain refinement.
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