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Ti6Al4V Ti6Al4V 64 Ti, Gr5 (Grade 5) Titanium Alloy _ Heat Treatment

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작성자 hnsonhnson 작성일23-02-22 14:32 조회47회 댓글0건

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Original title: Ti6Al4V 64 Ti, Gr5 (Grade 5) titanium alloy Titanium 6 aluminium-4 vanadium is generally considered the "base" of the titanium industry because it is by far the most widely used titanium alloy, accounting for more than 50% of the total use of titanium. It is an alpha + beta alloy that can be heat treated to achieve moderate strength. Titanium 6 aluminium-4 vanadium is recommended for use at temperatures not exceeding 350 ° C/660 ° F. Titanium 6 aluminium-4 vanadium is widely used in the aviation industry because of its hardness, light weight, forgeability and corrosion resistance. Component analysis: Description Pure titanium undergoes a transformation from a crowded hexagonal alpha phase to a solid individual centered beta image at 882.5 ° C/1620 ° F. The alloy element can be stabilized into an alpha phase or a beta phase through action. By using other alloys, the beta phase can stably coexist with the alpha phase at room temperature. This is the basis for the production of titanium alloys that can be heat treated to increase their strength. Titanium alloys can generally be divided into three categories: Alpha alloys: contain neutral alloying elements such as tin, and/or only alpha stable elements such as aluminum and oxygen, and cannot be heat treated; Alpha + Beta Alloys: generally contain a combination of alpha and beta stabilizers that can be heat treated at various levels. "Beta alloy: Metastable, containing large amounts of beta-stabilizers such as molybdenum and vanadium, that remain intact in the beta phase when quenched. Hardness can be significantly increased by solution treatment or aging.". Titanium 6 aluminium-4 vanadium is generally considered the "base" of the titanium industry because it is by far the most widely used titanium alloy, accounting for more than 50% of the total titanium used. It is an alpha + beta alloy that can be heat treated to achieve moderate strength. Titanium 6 aluminium-4 vanadium is recommended for use at temperatures not exceeding 350 ° C/660 ° F. Titanium 6 aluminium-4 vanadium is widely used in the aviation industry because of its hardness, light weight, forgeability and corrosion resistance. Application Titanium 6 aluminum-4 vanadium can be used in low to medium temperature environments where high strength, light weight, and excellent corrosion resistance are required. Such as parts of aircraft turbine engines, structural components of aircraft, aviation fasteners, high-performance automotive components, ships, medical equipment and sports equipment. Strength Coefficient Expand the full text One of the reasons titanium aluminum-vanadium is so widely used is its light weight and relatively high hardness. Its strength coefficient compared with other materials is as follows: Physical properties Density: 4.428g/cm3 (0.160 lb/in3) Modulus of elasticity: 105-116 Gpa (15.2-16.8 psi X 106) Beta commutation point: 955 +/-15 ℃ (1825 +/-25 25 ℉) Liquidus point: 1655 +/-20 ℃ (3011 +/-35 35 ℉) Solidification point: 1605 +/-10 ℃ (2920 +/-20 20 ℉) Resistivity: ~ 1.5 μΩm (-250 ℃) ~ 1.75 μΩm (room temperature) ~1.9μΩm(530℃) Magnetic properties: Titanium 6 aluminum-4 vanadium is not magnetic Thermal expansion chart Corrosion resistance When exposed to oxygen in air or water, titanium 6 aluminum-4 vanadium immediately and naturally forms a stable, continuous, and tightly adherent oxide film. This is due to its good corrosion resistance in different media. Titanium 6 aluminum-4 vanadium has excellent corrosion resistance in common corrosive solutions such as seawater, oxidizing acids, chlorine (present in water), rocket propellants, and alkalis. However, titanium 6 aluminium-4 vanadium is susceptible to general corrosion in weak acids or dry chlorine. Chlorinated solvents, cutting oils, and the like are generally avoided in titanium processing due to the occurrence of pressure corrosion cracking and corrosion cracking in environments containing chlorine or other halide ions. Titanium and titanium alloys including titanium 6 aluminum-4 vanadium are susceptible to hydrogen embrittlement. Gaseous or negative hydrogen can diffuse into metals to form brittle hydrogen. Therefore, in the process of processing, especially in the heat treatment and pickling process, the content of hydrogen must be reduced to a minimum. Product specifications for titanium 6 aluminium-4 vanadium generally specify a hydrogen content of no more than 150 ppm. General Corrosion Rate of Titanium 6 Aluminum 4 Vanadium in Different Media Heat treatment Fabricated products of titanium 6 aluminium-4 vanadium are generally used in the factory annealed or solution treated and fired condition.
Quenching (water quenching or equivalent) must be carried out as soon as possible after solution treatment in order to maximize the alpha martensite phase, i.e., to maximize the aging effect. Other heat treatments for titanium 6 aluminium-4 vanadium include stress relief of forged or welded portions, and beta annealing to improve damage tolerances. Like other titanium alloys, titanium 6 aluminum-4 vanadium has a high affinity for gases including oxygen, nitrogen, and hydrogen. The absorption of oxygen results in the formation of a very hard, brittle layer of oxidized alpha phase, the alpha shell, when heated in air. Intermediate and final annealing of titanium 6 aluminum-4 vanadium is typically performed in a vacuum or inert gas to avoid the formation of an alpha shell and the loss of related species. Vacuum annealing can be used to remove excess hydrogen, which is known as vacuum degassing. Vacuum heat treated parts must be thoroughly cleaned. Tensile strength comparison table Cleaning and finishing After air heat treatment, it is extremely important to completely remove the surface and internal alpha shell. It can be removed by mechanical methods such as grinding or machining, or by molten salt or abrasive descaling after pickling with a nitric/hydrofluoric acid mixture. Titanium alloys are susceptible to hydrogen embrittlement, so care must be taken to avoid the ingestion of excess hydrogen during heat treatment or pickling. The final heat treatment of the finished part must be carried out in vacuum if no processing or pickling is to be done. Cleaning of vacuum heat treated materials is of primary importance. Oil, ti6al4v eli , fingerprints, or smudges can cause the formation of alpha shells even under vacuum, and chlorine in some detergents can cause SCC of titanium. Therefore, the processing of vacuum heat treatment must conform to the following procedures: first clean thoroughly with a chlorine-free solvent or aqueous solution, then wash away the residual detergent with a large amount of deionized or distilled water (not tap water), and finally dry. After cleaning, gloves must be worn to prevent re-contamination. Select the processing performance Strength of annealed titanium 6 aluminium-4 vanadium at typical room temperature: Maximum tensile strength: 1380-2070Mpa (200-300ksi) Compressive yield strength: 825-895Mpa (120-130ksi) Maximum shear strength: 480-690 Mpa (70-100ksi) Processability at elevated temperatures: The higher the temperature, the lower the strength. Fatigue limit: The fatigue limit of titanium 6 aluminium-4 vanadium is mainly affected by the microstructure and surface condition. The general fatigue limit indices for annealed processed materials are as follows. Fatigue limit range of titanium 6 aluminium-4 vanadium (axial fatigue R = 0.06-1) Bright: 400-700Mpa (60-100ksi) Notch: 140-270Mpa (20-40 ksi) Fracture toughness The fracture toughness of Ti-6Al-4V is between that of aluminum alloy and steel. Microstructures with higher toughness are generally more thin layers and rougher structures. The ELI grade of titanium 6 aluminum-4 vanadium has a higher toughness than the regular grade. Wear performance: In general, titanium 6 aluminium-4 vanadium and titanium alloys have a tendency to galling and are generally not suitable for wear applications. Welding Titanium 6 aluminium-4 vanadium can be welded with titanium 6 aluminium-4 vanadium. Inert gas shielding techniques must be used during welding to avoid oxygen ingestion and embrittlement of the weld area. The most common welding process for titanium 6 aluminium-vanadium 4 is the gas tungsten shielded arc welding process. Gas metal arc welding is used for thicker parts. Plasma arc welding, spot welding, electron beam, laser beam, resistance welding and diffusion welding have been successfully used for titanium 6 aluminium-4 vanadium welding. Forgeability Hot work: Titanium 6 aluminum-4 vanadium can be hot worked by conventional methods such as hot drawing, forging, and hot pressing. Generally, the temperature of hot work is in the high temperature range of α/β, about 870-980 ℃ (1600-18001800 ℉). Care is taken to prevent the formation of excess alpha shells, which must be removed after processing. Thermal processing of the sheet is generally 650 ° C (1200 ° F to 1200 ° F). Titanium 6 aluminium-4 vanadium can be successfully superplastically worked in the range of 850 ° C (1560 1560 ° F). Warm "work": The yield strength of titanium 6 aluminium-4 vanadium in either the annealed or solution annealed condition decreases rapidly with temperature. This makes it forgeable at moderate temperatures. For example, heating at 427 ° C (800 to 800 ° F) results in approximately a 40% decrease in yield strength.
Warmwork is widely used in many products, including fasteners, aerospace components, and medical equipment. Cold work: Titanium 6 aluminium-4 vanadium has limited cold workability but can also be cold drawn and moulded. Cold work is mainly used for brackets and clamps. Due to the low modulus of titanium, processing at room temperature can cause a rebound phenomenon. In theory, this can be compensated for by overbending, but in practice, hot working is often used to correct the difference. Machining performance Using a ratio system based on AISI B1112 steel, the machinability of titanium 6 aluminium-4 vanadium is 22% of that of AISI B1112. In general, it is recommended to use low cutting speed, deep feed and a large amount of cutting agent. And because titanium is easily worn and contaminated, never stop feeding when tools and parts are about to come into contact. Use a chlorine-free cutting agent to prevent possible chlorine inhalation. Please note that titanium is highly flammable and appropriate safety precautions must be taken. Specification AMS(Aerospace Material Specification) 4928…………………… Bar, wire, forged, ring, annealed AMS(Aerospace Material Specification) 4965…………………… Bar, wire, forging, ring, solution annealing AMS(Aerospace Material Specification) 4967…………………… Bar, wire, forging, ring, solution annealing AMS(Aerospace Material Specification) 4963…………………… Bar, wire, forging, ring, heat treatable ASTM(American Standard of Testing Materials)B348…………… Rod, blank ASTM(American Standard of Testing Materials)F1472 ………… All shapes, annealed A5.16(ERTI-5)……………………………………………………… Bonded wire Shapes produced by Dynamet Stock Bar Fine Ground Bar Wire Dynalube Rolls SMART Coil Titanium Rolls Seamless coiled thin type bar profile Production shapes of other factories Ingot, sheet, plate,nickel titanium wire, pipe, casting, powder Return to Sohu to see more Responsible Editor:. yunchtitanium.com

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