Titanium alloy can obtain different phase composition and structure by adjusting the heat treatment process. It is generally believed that the small equiaxed structure has good plasticity, thermal stability and fatigue strength; the needle-shaped structure has higher endurance strength, creep strength and fracture toughness; the equiaxed and needle-shaped mixed structure has better comprehensive properties.
Commonly used heat treatment methods are annealing, solid solution and aging treatment. Annealing is to eliminate internal stress, improve plasticity and structural stability, and obtain better overall performance. Usually, the annealing temperature of α alloy and (α+β) alloy is selected at 120~200℃ below the (α+β)-→β phase transformation point; the solution and aging treatment are rapid cooling from the high-temperature zone to obtain martensite α′ Phase and meta-stable β-phase, and then keep these meta-stable phases in the middle-temperature zone to decompose, obtain α-phase or compound and other finely dispersed second-phase particles to achieve the purpose of strengthening the alloy. Usually (α+β) alloys are quenched at 40~100℃ below the (α+β)—→β phase transition point, and metastable β alloys are quenched at 40~80℃ above the (α+β)—→β phase transition point. get on. The aging treatment temperature is generally 450~550℃. In addition, in order to meet the special requirements of the workpiece, the industry also uses metal heat treatment processes such as double annealing, isothermal annealing, β heat treatment, and thermomechanical heat treatment.
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