Inconel 706 alloy composition properties and applications
Inconel 706 has excellent high temperature performance. It can maintain high strength and hardness in high temperature environments, and has good oxidation resistance and hot corrosion resistance. Therefore, it is often used in high-temperature applications such as aerospace engine components, gas turbine components, refinery units, and chemical equipment.
Inconel706 chemical composition:
C：0.06
Si: 0.35
Mn: 0.35
S: 0.02
P:0.02
Cr: 14.5~17.5
Ni: 39~44
Fe: remainder
Cu：≤0.3
V: -
Mo: -
Ti: 1.5~2.0
Al：≤0.4
Others: Co≤1.0
B≤0.006
Nb: 2.5~3.3
Mechanical behavior:
Yield strength: ≥830MPa (at room temperature)
Tensile strength: ≥980MPa (at room temperature)
Elongation: ≥12%
Hardness: HB≤280
Inconel 706 features;
1. Corrosion resistance: Inconel706 has excellent corrosion resistance. The high content of chromium makes it have good oxidation resistance in various environments, while the addition of nickel increases its good alkali resistance and acid resistance.
2. High temperature stability: Inconel706 shows excellent stability in high temperature environments and can maintain good mechanical properties in almost any temperature environment. It is an ideal material to adapt to high temperature conditions.
3. Oxidation resistance: Inconel 706 alloy has excellent oxidation resistance and can form a stable oxide layer under high temperature conditions to protect the material from oxidation and corrosion.
4. Welding performance: Inconel706 has excellent welding performance and can maintain its characteristics under various welding conditions, making it highly valuable in many important welding applications.
Inconel706 heat treatment system
Standard heat treatment systems for forged bars and rings are as follows:
(925-980)℃*(≥30 minutes)/(cooling on demand)+845℃10℃* 3h/AC+720℃10℃* 8h/FC(55℃/h)→620℃10℃* 8h/ AC; HBS≥285
Dynamic recrystallization and grain control of Inconel 706 alloy: The uniformly refined grain structure can significantly improve the tensile properties, fatigue properties and non-destructive testing performance of the alloy. By designing biconical compression specimens, the effects of deformation temperature and deformation amount on the microstructure of Inconel 706 alloy during hot deformation were studied. On the one hand, the DRX (dynamic recrystallization) mechanism and critical conditions of GH4706 alloy are discussed, which provides theoretical support for the physical model of numerical simulation. On the other hand, a new method of controlling the grains of Inconel 706 alloy using eta phase was explored. The results show:
(1) The DRX mechanism of Inconel 706 alloy is strain-induced discontinuous bending of the original grain boundaries. When the DRX critical temperature TDRX is 975°C, the critical deformation depends on the deformation temperature and the generation of deformation heat. When the deformation temperature is lower than TDRX, the reason why the alloy produces DRX is the temperature rise of the sample caused by deformation heat.
(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 as the deformation increases.
(3) Deformation at a temperature slightly lower than TDRX. Since some eta phases remain in the alloy, the pinning effect of this eta phase on sub-grain boundaries or grain boundaries can be fully utilized to achieve the deformation of Inconel 706 alloy by increasing the amount of deformation. Grain Refinement.
The application fields of Inconel 706 mainly include the following aspects:
1. Aerospace field: Inconel 706 is widely used in aerospace engines and turbines. It can be used to make critical components such as blades, combustion chamber components, nozzles, and turbine disks because it maintains high strength and corrosion resistance in high-temperature and high-pressure environments.
2. Chemical industry: Inconel 706 is also widely used in chemical equipment. Due to its excellent corrosion resistance, it can be used to manufacture reactors, heaters, heat exchangers and catalyst tubes. These equipment usually work in high temperature and corrosive environments, so the materials are required to have good corrosion resistance.
3. Oil and gas industry: The application of Inconel 706 in the oil and gas industry is mainly to manufacture components for oil well equipment and offshore drilling platforms. Due to the presence of high temperature, high pressure and corrosive gases and liquids in oil wells and marine environments, materials are required to have excellent high temperature resistance and corrosion resistance.
In short, with the development of science and technology and the advancement of industry, high-temperature alloys are also constantly being developed and upgraded. Currently, researchers are developing a series of new high-temperature alloys to improve their mechanical properties and processing properties, and to explore their application in a wider range of fields. In the future, high-temperature alloys will continue to exert their unique advantages and become one of the important representatives in the field of high-performance materials.
