TC4 density: p=4.44g/cm3.
TC4 melting temperature range 1630~1650C
TC4 magnetic properties: non-magnetic, the magnetic permeability μ=1.00005H/m under the condition of 1592A/m magnetic field strength.
TC4 titanium alloy is a metal with low density, high strength, and high heat resistance, and is widely used in the chemical industry and other fields. TC4 titanium alloy is the most used two-phase titanium alloy in the world because of its excellent comprehensive properties.
The main semi-finished products of TC4 titanium alloy are bars, forgings, thick plates, thin plates, profiles, and wires. The alloy is mainly used in the annealed state and can also be strengthened by solution aging treatment, but the transparent cross-section generally does not exceed 25mm.
The phase transition temperature a+ transition temperature is 980~1010C.
Time-temperature-tissue transition curve.
Alloy structure: The alloy is composed of a and B phases in an equilibrium state at room temperature, and the content of the phases is generally 8% to 10%. When the alloy is rapidly cooled from the B phase region, a supersaturated martensitic phase a is obtained; when rapidly cooled from the upper part of the a+B phase region, the a+a phase is obtained, accompanied by a small amount of retained B phase. During the aging process, both a' and B phases decompose into the a+B phase. When slowly cooling from the upper part of the a+B zone, the primary a phase, the flaky secondary a phase, and a small amount of retained B phase are obtained. The mixture of the secondary a-phase and retained B-phase is often referred to as a transformed B-structure.
Microstructure and mechanical properties of laser store forming TC4:
1. The laser three-dimensional forming TC4 alloy is composed of β columnar crystals that run through multiple cladding layers. It shows a light and dark layer structure along the deposition direction. The interior is a widmanstatten structure with small α clusters and martensite α′.
2. Stress relief annealing and solution aging treatment can weaken the lamination phenomenon and play a role in homogenizing the structure; stress relief annealing treatment can improve the overall strength and plasticity, but the effect is poor; solution aging treatment can obtain the basket structure, And equiaxed α phase can be obtained, which significantly improves the comprehensive mechanical properties of laser store forming TC4 alloy.
3. The tensile fracture of TC4 titanium alloy deposited and stress-relieved annealed by laser three-dimensional forming is a mixed fracture, the dimple is shallow and small, and the formation mechanism of the cleavage step is that the crack is along the parallel Widmanstatten α lath interface or grain boundary in the grain The continuous α phase interface is rapidly expanded and formed; the tensile fracture in the solution aging state is a ductile fracture, and the equiaxed α phase and basket structure obtained by solution aging treatment can reduce the slip distance and inhibit the occurrence of cleavage, significantly improving the comprehensive mechanical properties.
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