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Medium-strength and high-toughness titanium alloy with yield strength of 800MPa for ocean engineering and preparation process of medium-strength and high-toughness titanium alloy

A technology of yield strength and marine engineering, which is applied in the field of marine engineering, titanium alloy and its forming process, can solve the problems of unremarkable special performance of marine engineering, unsuitable for large-scale application in the marine field, and high comprehensive cost, so as to ensure structural safety, Improved structural safety and high stress corrosion resistance

Active Publication Date: 2022-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, TC4 and Ti80 have bottleneck properties that are not suitable for large-scale applications in the marine field because their special performance for marine engineering is not outstanding, or the overall cost is relatively high

Method used

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  • Medium-strength and high-toughness titanium alloy with yield strength of 800MPa for ocean engineering and preparation process of medium-strength and high-toughness titanium alloy
  • Medium-strength and high-toughness titanium alloy with yield strength of 800MPa for ocean engineering and preparation process of medium-strength and high-toughness titanium alloy
  • Medium-strength and high-toughness titanium alloy with yield strength of 800MPa for ocean engineering and preparation process of medium-strength and high-toughness titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0040] According to the alloy target control composition in Table 1, three kinds of Ti-Al-Mo-Cr-V-Sn-Zr titanium alloy ingots with different chemical compositions were smelted, the ingot weight was 700kg and the diameter was 380mm. The chemical compositions of the upper and lower parts of the three alloy ingots actually tested are shown in Table 2. After metallographic detection, it was found that the transformation points of the three alloys were 920±5℃ for 1# alloy, 950±5℃ for 2# alloy, and 950±5℃ for 3# alloy. The alloy ingots are successively subjected to billet forging in the β single-phase region, upsetting and drawing in the β single-phase region, forging in the α+β two-phase region, one-time thermal deformation in the β single-phase region, and ordinary annealing heat treatment. The specific process is as follows:

[0041] (1) According to the ratio of each alloy element in Table 1, the raw materials such as titanium sponge, aluminum-vanadium alloy, titanium-tin alloy,...

Embodiment 2

[0065] In Example 2, on the basis of Example 1, the content of Mo was reduced from 3% to 1% by weight, and the content of Sn was reduced from 2% to 1%. By comparing Table 3 and Table 5, it can be found that due to the weakening of the solid solution strengthening effect of solute elements, the strength of the alloy decreases (such as image 3 ), however, the ductility and toughness of the alloy did not decrease, especially the room temperature impact performance was significantly improved (such as Figure 4 shown). Therefore, the strength-toughness matching of the alloy can be optimized under the premise of reducing the production cost by appropriately reducing the content of Mo element and Sn element with weak solid solution strengthening effect.

Embodiment 3

[0066] In Example 3, based on Example 2, the content of Mo was increased from 1% to 1.5% by weight, and the content of Al was slightly increased. By comparing Table 5 and Table 7, it can be found that the solid solution strengthening effect of Mo element is strong, and the strength of the alloy is significantly improved, while the toughness of the alloy does not decrease. Therefore, by fine-tuning the content of Mo element in the alloy, the strength-toughness matching of the new alloy is further improved.

[0067] The new titanium alloy can be subjected to ordinary annealing heat treatment in a wide temperature range, and can achieve medium-strength and high toughness under ordinary annealing conditions. It can be seen from Tables 3 to 6 that the ordinary annealing temperature has little effect on the mechanical properties of the alloy at room temperature. After ordinary annealing at 540°C to 780°C, only the strength of the 2# alloy decreases when annealed at a higher temperat...

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Abstract

The invention discloses a medium-strength and high-toughness titanium alloy with yield strength of 800MPa for ocean engineering and a preparation process of the medium-strength and high-toughness titanium alloy, and belongs to the technical field of titanium alloys and forming processes of the titanium alloys. The alloy comprises the following chemical components: 4.5 to 5.5 percent of Al, 0.5 to 2.5 percent of Mo, 0.5 to 1.5 percent of Cr, 0.5 to 1.5 percent of V, 0.5 to 1.5 percent of Sn, 1.0 to 3.0 percent of Zr, less than or equal to 0.25 percent of Fe, less than or equal to 0.12 percent of O and the balance of Ti and inevitable impurity elements. Compared with the traditional moderate-strength titanium alloy with the yield strength of 800MPa, the novel alloy provided by the invention has higher room-temperature and low-temperature toughness and stress corrosion resistance. The novel titanium alloy provided by the invention can be used for manufacturing bars, plates, forgings and the like, and is applied to the technical field of ocean engineering such as ships, ocean platforms, marine aviation and the like.

Description

technical field [0001] The invention relates to the technical field of titanium alloy and its forming process, in particular to a medium-strength and high-toughness titanium alloy with a yield strength of 800 MPa for marine engineering and a preparation process thereof. The titanium alloy can be used for making medium-strength and high-toughness titanium alloy bars and plates. , forgings, etc., used in marine engineering technology fields such as ships and offshore platforms. Background technique [0002] Titanium alloys are widely used in aviation, aerospace and shipbuilding due to their excellent specific strength, corrosion resistance and high temperature resistance. As a structural material, the strength and toughness of titanium alloys are the key performance indicators for structural damage tolerance design. Good strength and toughness matching can greatly reduce structural weight while ensuring structural safety. At the same time, structural materials for marine engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C14/00C22C1/02C22F1/183
Inventor 马英杰雷家峰杨锐黄森森邱建科
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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