A fiber crystal toughened high-strength ultra-fine-grained pure titanium and its preparation method
A technology of ultra-fine-grained pure titanium and fiber crystal, which is applied in the field of fiber-crystal toughening high-strength ultra-fine-grained pure titanium material and its preparation field, which can solve the problem of low industrial production efficiency, insufficient high strength and toughness of pure titanium, and small size of pure titanium block. and other problems, to achieve the effect of excellent fatigue resistance, overcoming the bottleneck of toughness performance, and strong practicability
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Embodiment 1
[0056] Raw materials: coarse-grained pure titanium rods with a diameter of 56mm.
[0057] Follow the steps below to implement:
[0058] Step 1: Adjust the grain orientation by drawing one by one: select a drawing die with an outlet diameter of 48mm, and cold draw the initial coarse-grained pure titanium rod one by one, and the cold drawing temperature is 350°C.
[0059] Step 2: High-strain swaging: the first pass of swaging is to swage the 48mm-diameter titanium rod I obtained in step 1 to a diameter of 24mm, and the strain is about 1.38; the second pass is to turn the 24mm-diameter titanium rod to Forged to a diameter of 12mm, the strain is about 1.38, and the cumulative strain of two swivel forgings is about 2.77.
[0060] Step 3: Put the titanium rod ‖ with a diameter of 12 mm obtained in Step 2 in a vacuum furnace for recovery annealing at a temperature of 350° C. for 1 h.
[0061] Step 4: Multi-pass low-strain swaging: in the first pass, the titanium rod III with a diam...
Embodiment 2
[0068] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step 5 is 450° C., and the annealing time is extended to 30 minutes.
[0069] figure 1 The thin solid line in this case is the engineering stress-strain curve of the quasi-static tensile test along the swaging direction of the fiber crystal toughened high-strength ultra-fine-grained pure titanium prepared in this case. The yield strength is as high as 706.7MPa, and it has a very large work hardening rate. The tensile strength reaches 780.5MPa, the uniform plastic strain is 12.8%, and the elongation after fracture is greater than 21.3%. Compared with the properties obtained in Example 1, the strength is slightly reduced, but the plasticity is increased.
[0070] The microstructure is not significantly different from that of Example 1.
Embodiment 3
[0072] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step 5 is 500° C., and the time is 10 minutes.
[0073] Figure 5 It is the EBSD grayscale image of the fiber crystal toughened high-strength ultra-fine-grained pure titanium prepared in this implementation case. As indicated by the arrows, the material consists of fibrous crystals and equiaxed ultrafine grains. The statistical results in this area show that the average length of fiber crystals is 13.6 μm, the average aspect ratio is 17, and the volume ratio is about 40%; the average size of equiaxed ultrafine crystals is 0.56 μm. Compared with the results obtained in Example 1, the distribution of fiber crystals is more uniform.
[0074] Such as figure 1 The thick dotted line in this case is the engineering stress-strain curve of the quasi-static tensile test along the swaging direction of the fiber crystal toughened high-strength ultra-f...
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Abstract
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