The methods to improve the hardness of Gr5 titanium alloy mainly include the following:
Solid solution-aging heat treatment: The hardness of Gr5 titanium alloy can be raised from its initial 325–340HV to 490HV by adjusting the solution-aging heat treatment system. Hardness is more affected by the temperature of the solid solution and the cooling technique, whereas aging time has less effect.
Physical Vapor Deposition (PVD): The Gr5 titanium alloy's surface hardness can be raised to more than 2800HV using a coating made with PVD technology.
Supersonic Flame Spraying (HVOF): The surface hardness of Gr5 titanium alloy can be raised to greater than 1100HV using HVOF spraying technique.
Surface strengthening treatment: including surface oxygenation strengthening, mechanical grinding, vacuum nitriding, laser gas nitriding, plasma nitriding, and other techniques. These techniques can significantly enhance titanium alloys' surface strength and broaden their range of applications. For instance, Gr5 titanium alloy's wear resistance can be greatly enhanced using plasma nitriding technology, which can quadruple the alloy's surface microhardness compared to the matrix.
Composite strengthening treatment: Following mechanical ball milling, the Gr5 titanium alloy undergoes vacuum induction nitriding treatment, which can further increase its surface hardness, using the composite strengthening concept of mechanical deformation + vacuum nitriding.
The following are the application possibilities, benefits, and drawbacks of these techniques:
Heat treatment with solid solution aging: Low cost and suitable for large-scale production, although heat treatment parameters must be strictly controlled.
Physical Vapor Deposition (PVD): Ideal for uses where a high degree of hardness is needed, but the process is complicated and the equipment is costly.
Although hydronic flame spraying (HVOF) is useful for local strengthening and rapid repair, the bonding strength between the substrate and the coating may be weak.
Surface strengthening treatment: Such as laser gas nitriding, plasma nitriding, etc., performs well on a variety of intricately formed workpieces but requires costly equipment and a complex process.
Composite strengthening treatment: Surface hardness can be greatly increased by combining different strengthening techniques, although process control is challenging.
Through these methods, the hardness of Gr5 titanium alloy can be effectively improved to meet the needs of different application scenarios.
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