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A kind of preparation method of high-strength fine-grained pure titanium rod and wire
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A high-strength, rod-and-wire technology, which is applied in the field of preparation of high-strength fine-grained pure titanium rods and wires, can solve problems such as insufficient strength of pure titanium materials, achieve the effects of solving high-strength requirements, improving strength, and overcoming long process flow
Active Publication Date: 2018-09-14
SOUTHEAST UNIV +1
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Problems solved by technology
[0003] Technical problem to be solved: the purpose of this invention is to provide a method for preparing high-strength fine-grained pure titanium rods and wires to solve the problem of insufficient strength of pure titanium materials produced by traditional processes. By controlling the key links in the preparation process of titanium rods and wires and Process parameters, refine the grain size, significantly improve the strength of pure titanium
Method used
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Embodiment 1
[0016] Step 1, Nominal β-transition temperature T of TA1 titanium material β 900°C, TA1 titanium material is subjected to high-temperature hot rolling at about 895°C, and the strain rate is controlled at 0.5s -1 about;
[0017] Step 2, pre-deform the TA1 titanium material at 620°C, the strain amount is 0.5, and the strain rate is 0.005s -1 ;
[0018] Step 3, the TA1 titanium material is subjected to warm tensile deformation at 470°C, with a strain of 1.3;
[0019] Step 4, annealing the deformed TA1 titanium material at about 540° C. for 5 hours.
[0020] The yield strength of the TA1 titanium material produced by the above steps reaches 235MPa, and the tensile strength reaches 352MPa.
Embodiment 2
[0022] Step 1: Carry out high-temperature hot rolling on TA1 titanium material at about 905°C, and control the strain rate at 0.1s -1 about;
[0023] Step 2, pre-deform the TA1 titanium material at 615°C, the strain amount is 0.6, and the strain rate is 0.05s -1 ;
[0024] Step 3, the TA1 titanium material is subjected to warm tensile deformation at 490°C, with a strain of 1.5;
[0025] Step 4: Annealing the deformed TA1 titanium material at about 580° C. for 3 hours.
[0026] The yield strength of the TA1 titanium material produced by the above steps reaches 223MPa, and the tensile strength reaches 330MPa.
Embodiment 3
[0028] Step 1, the nominal β-transition temperature T of TA2 titanium material β 910°C, TA2 titanium material is subjected to high-temperature hot rolling at about 905°C, and the strain rate is controlled at 0.01s -1 about;
[0029] Step 2, pre-deform the TA2 titanium material at 610°C, the strain amount is 0.6, and the strain rate is 0.005s -1 ;
[0030] Step 3, the TA2 titanium material is subjected to warm tensile deformation at 490°C, with a strain of 1.3;
[0031] Step 4, annealing the deformed TA2 titanium material at about 550° C. for 4 hours.
[0032] The yield strength of the TA2 titanium material produced by the above steps reaches 320MPa, and the tensile strength reaches 445MPa.
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Abstract
The invention discloses a preparation method of high-strength fine-grain pure titanium bars and wires. The preparation method comprises the steps that high-temperature hot rolling is conducted on pure titanium at the temperature 10 DEG C above or below a beta transformation temperature point Tbeta (ranging from Tbeta-10 DEG C to Tbeta+10 DEG C), wherein the strain rate is controlled within 5 s<-1>; medium-temperature predeformation is conducted on pure titanium at the temperature ranging from 600 DEG C to 630 DEG C, wherein the strain capacity ranges from 0.3 to 0.8, and the strain rate is controlled within 0.1 s<-1>; warm drawing deformation is conducted on pure titanium at the temperature ranging from 450 DEG C to 580 DEG C, wherein the strain capacity reaches 1 or above; annealing treatment is conducted on pure titanium at the temperature ranging from 520 DEG C to 600 DEG C, wherein the heating time ranges from 2 h to 6 h, and then the high-strength fine-grain pure titanium bars and wires are obtained. The pure titanium bars and wires produced through the preparation method have the advantages of being fine and uniform in texture and high in strength.
Description
technical field [0001] The invention belongs to the technical field of pure titanium materials, and in particular relates to a preparation method of high-strength fine-grained pure titanium rods and wires. Background technique [0002] Pure titanium has many advantages such as high specific strength, corrosion resistance and heat resistance, and it is more and more widely used in various fields. With the continuous expansion of the application field of titanium materials, the demand and requirements for high-strength titanium materials continue to increase. Since pure titanium cannot be strengthened by alloying methods, the methods usually used to improve the strength of pure titanium materials include deformation strengthening and fine grain strengthening. Cold deformation processing is used to improve the strength of pure titanium by using work hardening. However, due to the poor plasticity of titanium at room temperature, the material is easy to break and the scrap rate ...
Claims
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Application Information
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