Heat-resistant titanium alloys TC4, TC6, TC11

TC4 (Ti-6Al-4V) TC6 (Ti-6Al-1.5Cr-2.5Mo-0.5Fe-0.3Si) TC11 (Ti-6Al-3.5Mo-1.5Zr-0.3Si)

Heatresistant titanium alloy (heatresistant titanium alloy) is a titanium alloy suitable for long-term work at higher temperatures. It has high transient and long-lasting strength in the whole working temperature range; good plasticity, good creep resistance and good thermal stability at room temperature; good fatigue resistance at both room and high temperatures. Mainly used in the manufacture of pressurized air in the disk, blade, intake magazine and aircraft structural components. Heat-resistant titanium alloys have been applied to solid solution strengthened a-β type and near a-type titanium alloy. Can work at 500 ℃ below the long-term a-β type heat-resistant titanium alloy, contain more a stabilizing elements, aluminum equivalent are more than 6%, add appropriate β stabilizing elements, so that the alloy at high temperatures not only has a high instantaneous strength, but also has sufficient plasticity. Typical alloys in China are TC4, TC6 and TC11. heat-resistant titanium alloys that work for a long time at 500℃ or below, contain a small amount of a stabilizing element. Aluminum equivalent almost all in more than 7%, in equilibrium state alloy has more amount of a phase, so these alloys in 500 ℃ above has higher creep resistance and better fatigue and fracture toughness. Nearly a-type alloys due to these excellent comprehensive performance, and become the main system of heat-resistant alloys. Typical alloys are U.S. Ti-811 and Ti-6242, Russia BT20, Britain IMI829 and so on.

The development of heat-resistant alloys with operating temperature higher than 500℃ is mainly to solve the contradiction between the thermal strength and thermal stability of alloys. At present, the heat-resistant titanium alloys used in foreign countries at about 600 ℃ are: British IMI834, the United States Ti-1100, Russia's BT18y, BT36, as well as China's Ti-60 and Ti-600 and so on.

1, TC4 (Ti-6Al-4V) titanium alloy

Operating temperature: -100-550 ℃, density: 4.51g/cm3 room temperature mechanical properties (25 ℃): tensile strength σb / MPa ≥ 895, specified residual elongation stress σr0.2 / MPa ≥ 825, elongation δ5 (%) ≥ 10, section shrinkage ψ (%) ≥ 25 high temperature mechanical properties (400 ℃) tensile strength: σb / MPa ≥ 620, durable Strength: σ100h/MPa≥570.

2, TC6 (Ti-6Al-1.5Cr-2.5Mo-0.5Fe-0.3Si) titanium alloy

Operating temperature: 300 ℃, density: 4.51g/cm3 room temperature mechanical properties (25 ℃) tensile strength σb/MPa ≥ 980, the specified residual elongation stress σr0.2/MPa ≥ 840, elongation δ5 (%) ≥ 10, sectional shrinkage ψ (%) ≥ 25 High-temperature mechanical properties (400 ℃) tensile strength: σb/MPa ≥735, endurance strength: σ 100h/MPa≥665.

3,TC11 (Ti-6Al-3.5Mo-1.5Zr-0.3Si) titanium alloy

Operating temperature: 500 ℃, density: 4.51g/cm3 room temperature mechanical properties (25 ℃) tensile strength: σb/MPa>1030, the specified residual elongation stress σr0.2/MPa ≥ 900, elongation δ5 (%) ≥ 10, sectional shrinkage ψ (%) ≥ 30 High-temperature mechanical properties (500 ℃) tensile strength: σb/MPa>685, endurance strength: σ 100h/MPa≥640.