Titanium alloy with matched high strength and toughness and preparation process of titanium alloy
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A titanium alloy and high toughness technology, applied in the field of titanium alloy and its forming process, can solve the problems of difficult forming of forgings, achieve the effects of improving strength and toughness, optimizing plastic rheological characteristics, and increasing tensile strength
Active Publication Date: 2017-04-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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Compared with the most widely used Ti-6Al-4V alloy, the chemical composition range of the new titanium alloy proposed by the present invention has an equivalent fracture toughness value and excellent strength-toughness matching when the tensile strength is significantly improved; at the same time, By adopting a special die forging process for this titanium alloy, the problem of difficult forming of forgings is solved
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Embodiment 1-4
[0043] In Table 1, Ti-Al-Sn-Zr-Mo-Cr-V-Fe-O alloys numbered 2#, 4#, 5#, and 9# have obtained strength and toughness through solution aging heat treatment. better match. It can be seen from Table 2 that the tensile strength of the above four-component alloy is greater than 1100MPa, and the fracture toughness is higher than 80MPa 1 / 2 .
[0044] In Table 1 and Table 2, the alloys numbered 2#, 4#, 5#, and 9# have obvious advantages in strength and toughness matching compared with TC4 alloys, and the alloys of 2#, 4#, 5#, and 9# The fracture toughness value of the alloy is equivalent to that of the TC4 alloy, and the strength is increased by about 100-200MPa, which can obtain obvious structural weight reduction effect under the premise of ensuring safety and reliability.
Embodiment 5
[0061] The specific preparation examples of high-strength and high-toughness titanium alloy forgings in this embodiment are as follows: including components selection, electrode pressing, ingot melting, ingot blanking, bar or plate forming and other processes.
[0062] 1) Alloy ingredients are distributed according to the following target components. The weight percentage of each constituent element is: Al: 5.8%, Sn: 2.1%, Zr: 2.0%, Mo: 3%, Cr: 1%, V: 1%, Fe : 0.16%, O: 0.15%, other elements such as C, N, H, Si and other elements are impurity elements, the weight percentages are all less than 0.1%, and the balance is Ti.
[0063] 2) Electrode pressing: finalize the ingredient list through composition design, selection of master alloys, and calculation of the ratio of different master alloys, and complete electrode pressing on a hydraulic press according to the ingredient list.
[0064] 3) Ingot smelting: After three times of vacuum self-consumption or plasma cooling furnace, t...
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Abstract
The invention relates to a titanium alloy and the field of forming processes, in particular to titanium alloy with matched high strength and toughness and a preparation process of the titanium alloy. The alloy comprises the following components in percentages by weight: 5.5-6.5% of Al, 1.5-2.5% of Sn, 1.5-2.5% of Zr, 2.5-3.5% of Mo, 0.5-1.5% of Cr, 0.5-1.5% of V, 0.1-0.3% of Fe, 0.1-0.2% of O and the balance of Ti and inevitable impurities. The preparation process of the alloy comprises the following steps: step one, carrying out one-heating-number forging in a beta single-phase region at the temperature of 20-50 DEG C above an alloy phase transformation point, wherein forging deformation is about 40%-80%; step two, forging and forming in an alpha+ beta two-phase region at the temperature of 20-50 DEG C below the alloy phase transformation point, wherein the heating number of forging of the two-phase region is controlled to be 1-3, and the accumulative deformation does not exceed 20%; and step three, carrying out heat treatment in a temperature range of 500-600 DEG C. The titanium alloy can be used for manufacturing various types of products such as rods and wires, plates and forge pieces of high-strength and high-toughness titanium alloy, and is applied to the fields of aviation, aerospace, ships and warships and the like with requirements on structure weight reduction and corrosion resistance.
Description
technical field [0001] The invention relates to the field of titanium alloy and its forming process, specifically refers to a titanium alloy containing multiple components with high strength and high toughness matching and its preparation process and forging heat treatment process, which can be applied to the key bearing structure of my country's new generation aircraft Components, as well as aerospace, ships and other technical fields that require structural weight reduction and corrosion resistance. Background technique [0002] Common two-phase titanium alloys mainly contain α-phase and β-phase. Titanium alloys with equiaxed α-phase have good strength but poor fracture toughness, while titanium alloys with lamellar structure have good toughness, but Strength and shaping are slightly worse than isometric tissue. It is the goal pursued by the industry to realize the combination of equiaxed structure and lamellar structure mechanical properties through chemical composition a...
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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 马英杰雷家峰杨锐王鼎春刘羽寅何书林乔璐郭佳林
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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