Solution strengthened nickel-based deformed superalloy GH3625 (GH625) Encyclopedia.
1. Overview. GH3625 (GH625) is a solution-strengthened nickel-based deformed superalloy with a temperature range of 980 1200. The alloy has excellent corrosion resistance and oxidation resistance in high-temperature environments, and is widely used in aviation, aerospace, energy and other fields.
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The main components of GH3625 (GH625) alloy are nickel, chromium, molybdenum and other elements, and good mechanical properties are obtained through solution strengthening and aging treatment.
Second, the chemical composition.
The chemical composition of GH3625 (GH625) is as follows:
Nickel (Ni): 4585%
Chromium (cr): 200%~23.0%
Niobium (NB): 10%~1.7%
Molybdenum (Mo): 80%~10.0%
Iron (Fe): 50%
Aluminium (AL): 04%
Titanium(Ti): 04%
Carbon(c): 01%
Manganese (mn): 05%
Silicon (Si): 05%
Phosphorus (p): 0015%
Sulfur (s): 0015%
Cobalt (Co): 10%
Copper (cu): 007%
3. Mechanical properties.
The mechanical properties of GH3625 (GH625) alloy at different temperatures are as follows:
1.At room temperature: tensile strength 760MPa, yield strength 450MPa, elongation 45%.
2.At high temperature: tensile strength 1100MPa, yield strength 700MPa, elongation 25%.
3.Fatigue properties: The alloy has good fatigue properties, and the fatigue strength at 100 is 1 at room temperature8 times.
4.Hardness: The hardness of the alloy decreases with increasing temperature, but it remains high throughout the temperature range of the service.
Fourth, process performance and requirements.
1.Heat treatment: The heat treatment process of the alloy includes solution treatment and aging treatment. The solution treatment has a temperature range of 1170 1200 °C and a holding time of 1 hour, followed by air or water cooling. The aging treatment has a temperature range of 650 750 °C and a holding time of 8 hours, followed by air or water cooling. By adjusting the heat treatment process parameters, different mechanical properties and microstructures can be obtained.
2.Melting and casting: The smelting and casting processes of alloys mainly include vacuum induction melting, electroslag remelting and vacuum directional solidification casting. By selecting the appropriate melting and casting process parameters, high-quality castings and good metallurgical quality can be obtained.
3.Welding: The alloy has good welding properties and can be welded by methods such as argon arc welding, laser welding and electron beam welding. Preheating treatment should be carried out before welding, and stress relief treatment should be carried out after welding to prevent the occurrence of cracks.
4.Work hardening: The work hardening phenomenon will occur during the machining process of the alloy, resulting in an increase in deformation resistance. In order to ensure the smooth progress of processing, the processing parameters should be reasonably selected, and intermediate annealing treatment should be carried out. The machined workpiece should be stress-relieved to restore its mechanical properties.