TA15
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TA15 is a near α titanium alloy, with a domestic designation of TA15, corresponding to the Russian designation BT20 and similar to the American Ti-6242S. Its main components are Ti-6.5Al-3.5Mo-1.5Zr-0.3Si, combining the heat resistance of α alloys with the strengthening effect of a small amount of β stabilizing elements.
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Coal tar epoxy steel pipe
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TA15
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Details description
Composition and Properties
The main components are Ti-6.5Al-3.5Mo-1.5Zr-0.3Si, combining the heat resistance of α-type alloys with the strengthening effect of a small amount of β stabilizing elements. It has good high-temperature performance, with a long-term operating temperature of 500-550℃ and a short-term temperature of up to 800℃. At the same time, it also has high specific strength, tensile strength ≥930MPa, and good weldability. It can be welded using TIG welding and electron beam welding, with a post-weld strength retention rate >90%. In addition, it has a low deformation rate under high temperature and high stress, making it suitable for long-term pressure-bearing components.
Product Forms
Common forms include plates, tubes, and bars. TA15 titanium plates can be used to manufacture aircraft fuselage skins and combustion chamber shells; the development of TA15 titanium alloy tubes has expanded the application range of titanium alloy tubes; bars can be processed into various shaft-type parts.
Application Areas
Aerospace: It is a core material for high-temperature structural components in aerospace, and can be used to manufacture fuselage skins, load-bearing frames, wing beams, casings, and turbine blades. For example, the use of TA15 titanium alloy in the wing beam of a certain type of military aircraft resulted in an 18% weight reduction and a 15% increase in fatigue life.
Marine Engineering: It can be used for submarine pressure hulls, with better resistance to seawater corrosion than TA7. It can also be used to manufacture propeller guide vanes, which can resist cavitation erosion.
Energy: It can be used in geothermal pipelines, resisting high-temperature geothermal fluid corrosion; it can also be used in nuclear power equipment, such as reactor cooling system liners, with better resistance to radiation embrittlement than ordinary titanium alloys.
Processing and Treatment: It is usually produced by three times vacuum self-consumable arc furnace melting and casting. The ingots are then repeatedly upset and formed in the β region and α+β region to prepare extruded billets, which are further processed into tubes and other products. Air cooling is mainly used, because rapid cooling (such as water quenching) easily leads to residual stress cracking. When used at high temperatures, an Al-Si coating should be sprayed to prevent oxidation and peeling above 600℃.
Comparison with Other Materials
Compared with TA7 titanium plate, TA15 titanium plate has higher strength, with a tensile strength ≥930MPa, while TA7 is approximately 800MPa. TA15 is a near-α type, containing Mo, Zr and other β stabilizing elements, while TA7 is an α type, without β stabilizing elements. In terms of cold formability, both are relatively poor, and TA15 is relatively more dependent on hot processing. In terms of cost, TA15 is more expensive due to the inclusion of rare metals Mo and Zr, while TA7 is relatively cheaper.
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