Titanium and titanium processing products?
Jul 26, 2022
Titanium is an isomer, melting point is 1720℃, below 882℃ dense hexagonal lattice structure, known as α titanium; Above 882℃, it exhibits a body centered cubic character structure, which is called β titanium. Using the different characteristics of the above two structures of titanium, adding appropriate alloying elements to gradually change the phase transition temperature and phase fraction content to get different structures of titanium alloy (Itanium Alloy). At room temperature, titanium alloys have three kinds of matrix structures, which are divided into the following three categories: α alloys,(α+β) alloys and β alloys. China is represented by TA, TC and TB respectively.
Alpha titanium alloy
It is a single-phase alloy composed of α phase solid solution, both at general temperature and at higher practical application temperature, is α phase, stable structure, wear resistance is higher than pure titanium, oxidation resistance. At 500℃ ~ 600℃, its strength and creep resistance are still maintained, but it cannot be strengthened by heat treatment, and its strength at room temperature is not high.
Beta titanium alloy
It is a single phase alloy composed of β phase solid solution, which has high strength without heat treatment. After quenching and aging, the alloy is further strengthened, and its strength can reach 1372 ~ 1666 MPa at room temperature. But poor thermal stability, not suitable for use at high temperature.
Alpha + beta titanium alloy
It is a duplex alloy, with good comprehensive properties, good microstructure stability, good toughness, plasticity and high temperature deformation performance, can be better for hot pressure processing, quenching, aging to strengthen the alloy. The strength after heat treatment is about 50% ~ 100% higher than that after annealing. High strength at high temperature, can work at 400℃ ~ 500℃ temperature for a long time, its thermal stability is inferior to α titanium alloy.
The most commonly used of the three titanium alloys are α titanium alloy and α+β titanium alloy; The machinability of α titanium alloy is the best, followed by α+ P titanium alloy and β titanium alloy. α titanium alloy is code-named TA, β titanium alloy is code-named TB, α+β titanium alloy is code-named TC.
Titanium alloy can be divided into heat resistant alloy, high strength alloy, corrosion resistant alloy (ti-molybdenum, ti-Palladium alloy, etc.), low temperature alloy and special function alloy (ti-iron hydrogen storage material and ti-nickel memory alloy), etc. The composition and properties of typical alloys are shown in the table.
Heat treatment Titanium alloy can obtain different phase composition and microstructure by adjusting heat treatment process. It is generally considered that fine equiaxed microstructure has good plasticity, thermal stability and fatigue strength. The acicular structure has higher durable strength, creep strength and fracture toughness. Equiaxed and acicular mixed structures have better comprehensive properties.
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