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Beta phase nearly isothermal forging of high-damage tolerant titanium alloy TC4-DT

A TC4-DT, isothermal forging technology, applied in the field of warm forging technology, can solve problems such as reducing plasticity, and achieve the effects of improving strength, improving fracture toughness, and stable and reliable performance

Inactive Publication Date: 2014-08-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

β heat treatment is to heat the sample to a certain temperature in the single-phase region and hold it for a certain period of time before annealing. The obtained structure is a flaky structure with straight grain boundaries, which can obtain high fracture toughness, but reduces the plasticity.

Method used

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  • Beta phase nearly isothermal forging of high-damage tolerant titanium alloy TC4-DT
  • Beta phase nearly isothermal forging of high-damage tolerant titanium alloy TC4-DT
  • Beta phase nearly isothermal forging of high-damage tolerant titanium alloy TC4-DT

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The mechanical properties of TC4-DT titanium alloy after adopting the above-mentioned β-phase region near-isothermal forging process can be seen from Table 1. Compared with the traditional two-phase region forging and quasi-β forging, on the basis of ensuring good plasticity, its Both strength and fracture toughness are improved.

[0021] Table 1 Mechanical properties after near-isothermal forging in β phase region, two-phase region forging and quasi-β forging

[0022]

Embodiment 2

[0024] The same material specifications and deformation conditions as in Example 1 were adopted, except that the final heat treatment was changed to a double annealing and solution aging system in the two-phase region, and their respective mechanical properties are listed in Table 2. It can be seen from the table that under the same deformation conditions, different heat treatment systems have a significant impact on its properties. Although solution aging can greatly increase the strength, its fracture toughness is significantly reduced, which is still not as good as that of near isothermal steel. Forged performance is reliable.

[0025] Table 2 Mechanical properties after near-isothermal forging in the β phase region and different heat treatment systems

[0026]

[0027]

Embodiment 3

[0029] Table 3 shows the performance comparison results of the TC4-DT titanium alloy using the above-mentioned near-isothermal forging process in the β phase region and the conventional β heat treatment and quasi-β heat treatment processes. It can be seen from Table 3 that near-isothermal forging in the β phase region can obtain a good strength-plasticity-toughness matching, and the performance is stable and reliable. Although there are also processes that meet the requirements in the β heat treatment, the overall performance matching is not as good as that of β The phase area is near isothermal forging, and the performance is unstable.

[0030] Table 3 Mechanical properties of TC4-DT titanium alloy with equiaxed original structure after different thermomechanical treatments

[0031]

[0032]

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Abstract

The invention relates to a beta phase nearly isothermal forging method for a high-damage tolerant titanium alloy TC4-DT. After a sample is heated to a certain temperature above T beta and preserved at the temperature for a certain time, deformation parameters, such as deformation degree and deformation speed and the heating temperature of a die during deformation are set in an isothermal forging control system of a hydraulic press so as to deform the sample, air cooling or water cooling is carried out after forging, and then, common annealing treatment is carried out on the deformed sample to ensure the stability of texture. The method belongs to a beta phase nearly isothermal forging technology which not only improves the fracture toughness of the TC4-DT alloy, but also can improve the tenacity. A flaky texture with high plasticity is obtained, the flaky tissue not only has the plasticity of a basket-weave structure, but also has the inherent excellent properties of the flaky texture, damage design requirements can be met, and the stable and reliable performance of components in actual application is ensured.

Description

technical field [0001] The invention belongs to the technical field of thermal processing of titanium alloys, in particular to a near-isothermal forging of a high damage tolerance titanium alloy TC4-DT in a β-phase region, which can obtain high plasticity while ensuring high strength and fracture toughness A near-isothermal forging process in the β phase region. Background technique [0002] Two-phase titanium alloys can obtain four different types of microstructures according to their different processing techniques, namely equiaxed microstructure, two-state microstructure, basket microstructure, and lamellar microstructure. Equiaxed and two-state microstructures have good matching of strength and plasticity and low cycle fatigue performance, but their creep resistance and fatigue crack growth resistance are poor. The lamellar structure has high fracture toughness, creep resistance and durable strength, but its plasticity is poor. The fatigue performance of the basket str...

Claims

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Application Information

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IPC IPC(8): C22F1/18B21J5/02
Inventor 彭小娜郭鸿镇姚泽坤石志峰秦春赵张龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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