CN-121992248-A - High-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment

Abstract

The invention discloses a high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment, which comprises, by mass, 4.8% -5.5% of Al, 2.8% -3.2% of Mo, 2.5% -3.5% of V, 2.8% -3.2% of Cr, 1.5% -2.5% of Zr, 0.8% -1.2% of Nb, and the balance of Ti and unavoidable impurity elements, wherein B 0 ≤0.767,2.374≤M d is more than or equal to 0.765 and less than or equal to 2.385. According to the invention, through adding Al, mo, V, cr, zr, nb elements and controlling the content of the elements and reasonably matching B 0 and M d , the control of the structure performance regulation window after the additive manufacturing of the alloy is realized, so that the alloy has better strong plasticity performance after the additive manufacturing molding and heat treatment, the selection is provided for deep sea equipment, the structure of the deep sea equipment can be optimized, the weight is reduced, and the comprehensive performance of the equipment is improved after the additive manufacturing is applied.

Inventors

• ZHANG SIYUAN
• LI QIAN
• LI SILAN
• XIN SHEWEI
• MAO CHENGLIANG
• WANG JIALU

Assignees

• 西北有色金属研究院

Dates

Publication Date

20260508

Application Date

20260225

Claims (4)

1. 1. A high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment is characterized by comprising, by mass, 4.8% -5.5% of Al, 2.8% -3.2% of Mo, 2.5% -3.5% of V, 2.8% -3.2% of Cr, 1.5% -2.5% of Zr, 0.8% -1.2% of Nb and the balance of Ti and unavoidable impurity elements, wherein d-electron concentration parameter B 0 of the high-strength and high-toughness titanium alloy meets 0.765- 0 -0.767, parameter M d meets 2.374-M d -2.385, tensile strength R m -1100 MPa, yield strength R p0.2 -1050 MPa and elongation A-9% of the high-strength and high-toughness titanium alloy subjected to solid solution and aging treatment after additive manufacturing and molding.
2. 2. The high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment according to claim 1, wherein the high-strength and high-toughness titanium alloy comprises the following components in percentage by mass.
3. 3. The high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment according to claim 1, wherein the high-strength and high-toughness titanium alloy comprises the following components in percentage by mass.
4. 4. The high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment according to claim 1, wherein the high-strength and high-toughness titanium alloy comprises the following components in percentage by mass.

Description

High-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment Technical Field The invention belongs to the technical field of titanium alloy materials, and particularly relates to a high-strength and high-toughness titanium alloy for additive manufacturing of deep sea equipment. Background The titanium alloy material has the advantages that the titanium alloy material hardly corrodes in seawater, can greatly reduce maintenance and maintenance work of ship equipment and the like in the seawater, is honored as ocean metal, and can be widely used as a structural member due to the excellent high specific strength characteristic. Along with the proposal of the construction of ocean national strategy, novel equipment facing extreme environments such as deep sea and the like is rapidly developed, and new demands are put forward for higher-performance materials and structures meeting the application of the deep sea environment. The additive manufacturing technology is a near net forming manufacturing mode of stacking from zero according to a component structure, and is contrary to traditional component blank manufacturing and residual material removing material reducing manufacturing by machining, the additive manufacturing only fills a required area, and a structure which is difficult or impossible to process due to space interference in the original machining can be easily manufactured, so that the additive manufacturing technology has important value for weight reduction and optimization of a structural component, and in the fields of aerospace and the like, the additive manufactured titanium alloy component has started to enter a popularization and use stage. But the materials used in the additive manufacturing of titanium alloys are all conventional materials used in the subtractive manufacturing. Titanium alloy is used as a dual-phase metal material with a complex phase structure, and unlike steel, the structural performance state of the material can be adjusted in a large range through a heat treatment process, a solidification structure formed by a large amount of plastic deformation, crushing and smelting is needed, and then the microstructure is subjected to fine adjustment on the phase structure through heat treatment. It can be said that the properties of conventional titanium alloy materials are determined by both deformation and heat treatment. However, the titanium alloy component manufactured by additive loses the deformation process, and the supernormal metallurgical process and the cyclic heating process in the forming process are obviously different from the traditional titanium alloy material preparation, so the characteristic of coupling additive manufacturing and forming is an important development direction of domestic and foreign scientific research and engineering at present. The prior art is analyzed, and most of titanium alloy materials used by the current ocean engineering equipment are Ti-6Al-4V (TC 4) and Ti-6Al-3Nb-2Zr-1Mo (Ti-80) alloys with high strength in 800 MPa. The TC4 alloy is widely applied to aerospace structural members due to long development time and mature research of preparation and application technologies, and can be used in a high-temperature service environment below 400 ℃, and the tensile strength R m is more than or equal to 895MPa and the yield strength R p0.2 is more than or equal to 825MPa. In order to meet the toughness requirements of marine engineering equipment, it is generally necessary to reduce the content of interstitial elements of TC4 to improve the toughness, but the strength is slightly reduced (R p0.2 is larger than or equal to 795 MPa). The Ti80 alloy is a special titanium alloy developed for ships and deep submarines in China, the tensile strength R m is more than or equal to 880MPa, the yield strength R p0.2 is more than or equal to 800MPa, the impact energy KV 2 is more than or equal to 55J, and the alloy has good toughness under medium and high strength. The invention patent with publication number CN114592142A discloses a medium-strength high-toughness titanium alloy with yield strength of 800MPa for ocean engineering, and a preparation process thereof, wherein the tensile strength R m is more than or equal to 880MPa, the yield strength R p0.2 is more than or equal to 800MPa, the impact energy KV 2 is more than or equal to 70J, the titanium alloy for ocean engineering with the fracture toughness of K IC≥100MPa·m1/2 has excellent impact resistance and fracture toughness performance, but has relatively low strength level. The invention patent with publication number CN107541615A discloses a titanium alloy for ocean engineering, which has good impact resistance but relatively low strength level, wherein the tensile strength R m is more than or equal to 850MPa, the yield strength R p0.2 is more than or equal to 750MPa and the impact toughness alpha KV2≥30J/cm2. these alloys have low levels of plastic