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Novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy

A titanium alloy, low-cost technology, applied in the new low-cost, seawater corrosion-resistant titanium alloy, high plasticity field, can solve the problems of high material processing loss, high cost, long processing cycle, etc., to reduce the cost of raw materials and improve the deformation capacity. , the effect of improving the plastic deformation ability

Active Publication Date: 2017-01-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Through the above analysis, it can be seen that part of the reason for the high cost of titanium alloy products is the composition of precious metals in raw materials, long processing cycles during material processing, and high material processing losses.

Method used

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  • Novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy
  • Novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy
  • Novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy

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Experimental program
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Effect test

Embodiment 1-3

[0048] In Table 2, when the tensile strength of 1#, 2#, and 3# alloys is basically equivalent to that of Ti-6Al-4V, the plasticity and toughness are significantly improved. This is mainly due to the fact that an appropriate amount of Fe and Cu elements can reduce the activation energy of plastic deformation, produce the beneficial effects of "phase transformation plasticization" and "phase transformation toughening", and the interaction of the two elements, which comprehensively improves the plasticity and toughness of titanium alloys. . In addition, 1#, 2#, and 3# low-cost titanium alloys included in the present invention are compared with Ti-6Al-4V alloys in chemical composition, by reducing the amount of vanadium elements with higher prices, increasing the lower iron and copper elements Dosage, and further optimize the matching of the content of each element, so that the raw material cost of the new titanium alloy is significantly lower than that of the Ti-6Al-4V alloy.

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Embodiment 4

[0056] According to the composition of the chemical composition, ingredients were prepared and smelting electrodes were prepared, and a titanium alloy with low cost, high plasticity and seawater corrosion resistance was smelted by three vacuum self-consumption methods. The composition is 1#, 2#, 3# alloys in Table 1. The ingot is forged at 1150°C, and the grains are broken by upsetting at 1050°C, and then forged at 880°C in the α+β two-phase region to form a bar with a diameter of 120mm, and finally forged at 880°C through a precision forging process to form a bar with a diameter of 60mm. bar. The 60mm diameter bar was subjected to 8 different heat treatments, and the heat treatment specifications are shown in Table 3. Sampling and analysis of the rod section after heat treatment is carried out to detect the tensile strength and plasticity of the material.

[0057] 8 kinds of heat treatment systems involved in the present invention in table 3

[0058] Numbering ...

Embodiment 5

[0061] Taking the 2# composition alloy in Table 1 as the object, the corrosion behavior of the alloy in three different concentrations of NaCl solutions was studied. The concentrations of NaCl solutions were 3.5%, 7%, and 14% (weight percent). The surface morphology after soaking in the above NaCl solution for 7 weeks is as follows: Figure 13 , Image 6 , Figure 14 shown. It can be seen that after soaking in the above three NaCl solutions for 7 weeks, no obvious corrosion behavior occurred, indicating that the alloy has good seawater corrosion resistance.

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Abstract

The invention discloses a novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy, belonging to the technical field of a new titanium alloy. The novel low-cost high-plasticity sea-water-corrosion-resistant titanium alloy comprises the following elements by weight: 3.0-4.5% of Al, 2.0-3.0% of V, 0.5-1.5% of Fe, 0.5-2.0% of Cu and balance of Ti and impurity elements. Compared with Ti-6Al-4V alloy, the characteristics of the new alloy are as follows: (1) the raw materials are low in cost, hot workability plasticity is good, yield is high, and low is significantly reduced; (2) room temperature tensile strength of the new alloy after annealing is equal to that of the Ti-6Al-4V alloy, room temperature plasticity is higher, and the new titanium alloy is suitable for cold processing and warm processing forming of plates and pipes; and (3) corrosion resistance in seawater of the alloy is further improved. The titanium alloy is suitable for producing titanium alloy products such as rods, wires, plates, pipes,and the like, and can be widely used in the technical fields of aviation, spaceflight, ocean, and the like.

Description

technical field [0001] The invention relates to the technical field of new titanium alloys, in particular to a new low-cost, high-plasticity, seawater corrosion-resistant titanium alloy, which is suitable for being made into rods, wires, plates, pipes, etc., and can be widely used in aviation, Aerospace, marine and other technical fields. Background technique [0002] Due to its high specific strength and excellent corrosion resistance, titanium alloys have been widely used in aviation, aerospace, marine and other fields, among which Ti-6Al-4V alloy is more typical. Titanium accounts for 0.6% of the earth's crust, second only to aluminum, iron, and magnesium. However, corresponding to the huge reserves, the amount of titanium alloy used in different fields is significantly lower than that of aluminum alloy and steel. The main barrier restricting the wide application of titanium alloy is its higher cost compared with steel and other materials. [0003] The high cost of tita...

Claims

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Application Information

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IPC IPC(8): C22C14/00
Inventor 杨锐雷家峰马英杰黄森森刘羽寅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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