Ultrahigh-strength and ductility low-cost titanium alloy and preparation method and application thereof

Abstract

The invention relates to ultrahigh-strength and ductility low-cost titanium alloy. The titanium alloy is prepared from Ti, Mo, Cr, Al and Fe, wherein the mass of Ti is more than 75% of the total massof the titanium alloy. The invention further provides a preparation method of the titanium alloy. In order to reduce the total cost of the titanium alloy, preferably, Mo, Cr, Al and Fe elements in thealloy are added in the form of intermediate alloy of Al-Mo, Mo-Fe and Cr-Fe. The ultrahigh-strength and ductility low-cost titanium alloy has ultrahigh strength and ductility, has ideal yield strength, high ductility and good work hardening rate, can be processed into rods, plates, profiles and the like, has the advantage of low use cost and has high application values in the field of aviation, aerospace, marine exploration, shipbuilding and / or automobile making.

Description

technical field

[0001] The invention belongs to the technical field of alloys, and relates to a low-cost titanium alloy with super high strength and plasticity and a preparation method. Background technique

[0002] The strength-plastic product refers to the product of the room temperature tensile strength of the material and the total elongation at break, and is often used as one of the indicators for judging the comprehensive performance of structural metal materials. However, the strength and plasticity (expressed by elongation) of metal materials are generally incompatible. That is, if high strength is obtained, the plasticity will decrease; In order to obtain metal materials with high strength and plasticity, it is generally necessary to adjust the chemical composition of the alloy and develop a better heat treatment process. For example, after decades of development of high-strength plastic steel, on the basis of the first and second generation high-strength plastic s...

Examples

Embodiment 1

[0025] This embodiment provides a low-cost titanium alloy with ultra-high strength and plasticity, and its chemical composition is Mo7%, Cr 4%, Al 4%, Fe 1%, and the balance is Ti.

[0026] The ultra-high-strength plastic product low-cost titanium alloy provided in this example is prepared by the following method:

[0027] (1) According to the weight percentage of each component, respectively weigh the sponge Ti particles, the master alloy Al-Mo, the master alloy Mo-Fe and the master alloy Cr-Fe;

[0028] (2) Stir and mix the weighed raw materials evenly and press them into consumable electrode blocks, and use tungsten sub-arc welding to weld between the electrode blocks. The purity of argon gas used for welding is 99.99%; vacuum is used The consumable electric arc furnace is smelted three times to prepare ingots;

[0029] (3) After skinning the ingot, removing the riser and the bottom, the ingot is subjected to a homogenization heat treatment at 1050° C. for 12 hours in a va...

Embodiment 2

[0038] This embodiment provides an ultra-high-strength plastic product low-cost titanium alloy, the chemical composition of which is Mo6%, Cr 4%, Al 4%, Fe 2%, and the balance is Ti.

[0039] The preparation method is the same as in Example 1.

[0040] The alloy's with The values ​​are 2.35 and 2.77 respectively, and the [Mo]eq is 14.2. The alloy belongs to the metastable β-type titanium alloy. It can be seen from the test that the titanium alloy provided in this embodiment has excellent tensile strength and elongation, and the strength-plasticity product is ≥ 45 GPa·%.

Embodiment 3

[0042] This embodiment provides a low-cost titanium alloy with ultra-high strength and plasticity, and its chemical composition is composed of Mo7%, Cr 3%, Al 3%, Fe 1%, and the balance is Ti.

[0043] The preparation method is the same as in Example 1.

[0044] The alloy's with The values ​​are 2.38 and 2.78 respectively, and the [Mo]eq is 11.7. The alloy belongs to the metastable β-type titanium alloy. It can be seen from the test that the titanium alloy provided in this embodiment has excellent tensile strength and elongation, and the strength-plasticity product is ≥ 45 GPa·%.

technical field

[0001] The invention belongs to the technical field of alloys, and relates to a low-cost titanium alloy with super high strength and plasticity and a preparation method. Background technique

[0002] The strength-plastic product refers to the product of the room temperature tensile strength of the material and the total elongation at break, and is often used as one of the indicators for judging the comprehensive performance of structural metal materials. However, the strength and plasticity (expressed by elongation) of metal materials are generally incompatible. That is, if high strength is obtained, the plasticity will decrease; In order to obtain metal materials with high strength and plasticity, it is generally necessary to adjust the chemical composition of the alloy and develop a better heat treatment process. For example, after decades of development of high-strength plastic steel, on the basis of the first and second generation high-strength plastic s...

Examples

Embodiment 1

[0025] This embodiment provides a low-cost titanium alloy with ultra-high strength and plasticity, and its chemical composition is Mo7%, Cr 4%, Al 4%, Fe 1%, and the balance is Ti.

[0026] The ultra-high-strength plastic product low-cost titanium alloy provided in this example is prepared by the following method:

[0027] (1) According to the weight percentage of each component, respectively weigh the sponge Ti particles, the master alloy Al-Mo, the master alloy Mo-Fe and the master alloy Cr-Fe;

[0028] (2) Stir and mix the weighed raw materials evenly and press them into consumable electrode blocks, and use tungsten sub-arc welding to weld between the electrode blocks. The purity of argon gas used for welding is 99.99%; vacuum is used The consumable electric arc furnace is smelted three times to prepare ingots;

[0029] (3) After skinning the ingot, removing the riser and the bottom, the ingot is subjected to a homogenization heat treatment at 1050° C. for 12 hours in a va...

Embodiment 2

[0038] This embodiment provides an ultra-high-strength plastic product low-cost titanium alloy, the chemical composition of which is Mo6%, Cr 4%, Al 4%, Fe 2%, and the balance is Ti.

[0039] The preparation method is the same as in Example 1.

[0040] The alloy's with The values ​​are 2.35 and 2.77 respectively, and the [Mo]eq is 14.2. The alloy belongs to the metastable β-type titanium alloy. It can be seen from the test that the titanium alloy provided in this embodiment has excellent tensile strength and elongation, and the strength-plasticity product is ≥ 45 GPa·%.

Embodiment 3

[0042] This embodiment provides a low-cost titanium alloy with ultra-high strength and plasticity, and its chemical composition is composed of Mo7%, Cr 3%, Al 3%, Fe 1%, and the balance is Ti.

[0043] The preparation method is the same as in Example 1.

[0044] The alloy's with The values ​​are 2.38 and 2.78 respectively, and the [Mo]eq is 11.7. The alloy belongs to the metastable β-type titanium alloy. It can be seen from the test that the titanium alloy provided in this embodiment has excellent tensile strength and elongation, and the strength-plasticity product is ≥ 45 GPa·%.

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