With the development of science and technology, the application fields of titanium alloys are also very extensive, so what is the performance of titanium alloys? The titanium screw manufacturer will briefly share with you
Titanium alloy is an alloy composed of titanium as the matrix and other elements. Titanium has two homogenous and heterogeneous crystals: below 882°C it is close-packed hexagonal α titanium and above 882°C it is body-centered cubic β titanium.
According to the influence on the phase transition temperature, alloying elements can be divided into three categories:
1. Stable alpha phase
2. Stable β phase
3. The element that has little effect on the phase transition temperature is a neutral element.
The main impurities of titanium alloys: oxygen, nitrogen, carbon and hydrogen.
Alpha titanium alloy: It is a single-phase alloy composed of secondary solid solute. It has a stable microstructure, higher wear resistance and stronger oxidation resistance than pure titanium, at normal temperatures and higher actual application temperatures. At a temperature of 500℃~600℃, it still maintains its strength and creep resistance, but it cannot be strengthened by heat treatment, and its strength is not high at room temperature.
β titanium alloy: It is a single-phase alloy composed of β-solid solute. It has higher strength without heat treatment. After quenching and aging, the alloy is further strengthened, and the room temperature strength can reach 1372～1666MPa, but the thermal stability is poor and it is not suitable for high temperature use.
α+β titanium alloy: It is a dual-phase alloy with good comprehensive properties, good structure stability, good toughness, plasticity and high temperature deformation properties, and can be better used for hot pressing, quenching, aging and other alloys Of reinforcement. The strength after heat treatment is 50%~99% higher than the strength after annealing. The high temperature strength can work for a long time when the high temperature strength is 400~500~C, and the thermal stability is not as good as that of α titanium alloy.
Titanium alloys can be divided into heat-resistant alloys, high-strength alloys, corrosion-resistant alloys (titanium-molybdenum, titanium-palladium alloys, etc.), low-temperature alloys and special functional alloys (titanium iron hydrogen storage materials and titanium nickel memory alloys). By adjusting the heat treatment process of the titanium alloy, different phase compositions and microstructures can be obtained. It is generally believed that the fine equiaxed structure has good plasticity, thermal stability and fatigue strength. The acicular structure has high enduring strength, creep strength and fracture toughness. The mixed structure with different shafts and needles has better overall performance.
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