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Classification and properties of titanium alloy

Views: 0     Author: Site Editor     Publish Time: 2022-11-22      Origin: Site

Titanium alloys are alloys containing a mixture of titanium and other chemical elements.This alloy has very high tensile strength and toughness (even at extreme temperatures).They are lightweight, have extraordinary corrosion resistance and the ability to withstand extreme temperatures.However, the high cost of raw materials and processing limits their use in military applications, aircraft, spacecraft, bicycles,medical equipment, jewelry, high-stress components such as connecting rods on expensive sports cars, and some advanced sports equipment and consumer electronics use.Although "commercially pure" titanium has acceptable mechanical properties and has been used in orthopedic and dental implants, for most applications titanium is alloyed with small amounts of aluminum and vanadium, typically 6% and 4% by weight, respectively.This mixture has a solid solubility that varies significantly with temperature, making it capable of precipitation strengthening.This heat treatment process is carried out after the alloy has been worked into its final shape but before it is put into service, making it easier to manufacture high-strength products. titanium alloy sheet gr5 astmb265-

Products Descriptions:

  • Product  name: titanium alloy sheet  GR5  ASTM B265 

  • Thickness: 0.3-100mm

  • Width: 20-1250mm

  • Length: less than 6000mm

  • Shape: Rectangle, square, circle, diamond,Customized

  • Technique: Cold Rolled, Hot rolled & cold rolled

  • Grade: Gr1 Gr2 Gr3 Gr4 Gr5 Gr7 Gr9 Gr12 Gr23 Ti6Al4V-Eli

  • Standard: ASTM B265,ASME SB265,AMS4911,ASTM F136,ASTM F67

  • Advantage: Corrosion Resistance

  • Material: pure or alloy titanium

  • Surface: Bright, Polished, Pickling, Acid cleaning, Sandblasting

  • Density: 4.51kg/cm3 

Categories

  • Titanium alloys are generally divided into four categories:

  • Alpha alloys containing only neutral alloying elements (such as tin) and/or alpha stabilizers (such as aluminum or oxygen).These are not heat treatable.Examples include:Ti-5Al-2Sn-ELI, Ti-8Al-1Mo-1V.

  • Near alpha alloys contain small amounts of ductile beta phase. Near-alpha alloys are alloyed with 1-2% beta-phase stabilizers such as molybdenum, silicon, or vanadium in addition to the alpha-phase stabilizer. Examples include:Ti-6Al-2Sn-4Zr-2Mo, Ti-5Al-5Sn-2Zr-2Mo, IMI 685, Ti 1100.

  •  Alpha and beta alloys, which are metastable, usually contain some combination of alpha and beta stabilizers, and can be heat treated. Examples include: Ti-6Al-4V, Ti-6Al-4V-ELI, Ti-6Al-6V-2Sn, Ti-6Al-7Nb.

  •  Beta and near-beta alloys, which are metastable and contain enough beta stabilizers (such as molybdenum,silicon, and vanadium) to allow them toretain the beta phase when quenched, and can also be solution treated and aged to increase strength.Examples include:Ti-10V-2Fe-3Al,Ti–29Nb–13Ta–4.6Zr, Ti-13V-11Cr-3Al, Ti-8Mo-8V-2Fe-3Al, Beta C, Ti-15-3.

Beta-titanium

Beta titanium alloys exhibit the BCC allotropic form of titanium, known as beta.The elements used in this alloy are one or more of the following elements, but with varying amounts of titanium.These are molybdenum, vanadium, niobium, tantalum, zirconium, manganese, iron, chromium, cobalt, nickel copper.Titanium alloys have excellent formability and are easy to weld.β titanium is now mainly used in the field of orthodontics, and was used in orthodontics in 1980s.This type of alloy has replaced stainless steel in some uses, which has dominated orthodontics since the 1960s.It has nearly twice the strength/modulus ratio of 18-8 austenitic stainless steel, greater elastic deflection of the spring, and 2.2 times lower force reduction per unit displacement than appliances.Some β-titanium alloys can be transformed into hard and brittle hexagonal omega-titanium at low temperature or under the influence of ionizing radiation.

Properties

In general, β-phase titanium is the more ductile phase, while α-phase is stronger but less ductile, due to the higher number of slip planes in the bcc structure of β-phase compared to hcp α-phase. α-β phase titanium has mechanical properties in between.Titanium dioxide dissolves in metals at high temperatures and its formation is very dynamic.These two factors mean that all but the most carefully purified titanium contains a significant amount of dissolved oxygen and can therefore be considered a Ti-O alloy.Oxide precipitates provide some strength (as above) but do not respond well to heat treatment and can reduce the toughness of the alloy.Many alloys also contain titanium as a small additive, but since alloys are usually classified according to the elements that make up the bulk of the material, they are not usually considered "titanium alloys".Titanium alone is a strong light metal.It is stronger than ordinary mild steel, yet weighs 45% less. It's also twice as strong as weaker aluminum alloys, but only 60% heavier.Titanium has excellent corrosion resistance to seawater, so it is used  propeller shafts, rigging and other parts of boats exposed to seawater.Titanium and its alloys are used in aircraft, missiles and rockets where strength, light weight and high temperature resistance are important.In addition, because titanium does not react in the human body, titanium and its alloys can be used in artificial joints, screws, plates for fractures, and other biological implants.

Titanium grades

The ASTM International Standard for Seamless Tubing for Titanium and Titanium Alloys cites the following alloys and requires the following treatments:"Alloys may be supplied as follows: Grades 5, 23, 24, 25, 29, 35, or 36 annealed or aged; Grades 9, 18, 28, or 38 cold worked and stress relieved or annealed; Grades 9, 18, 23, 28, or 29 transformed-beta condition; and Grades 19, 20, or 21 solution-treated or solution-treated and aged.”"NOTE 1—Class H materials are identical to the corresponding numerical grades (i.e., Class 2H = Class 2), except for a higher guaranteed minimum UTS, and can always be shown to meet the requirements of their corresponding numerical grades.Class 2H, 7H, 16H and 26H are mainly used in pressure vessels.”"Class H was added at the request of user associations based on a study of more than 5,200 commercial Class 2, 7, 16 and 26 test reports, of which more than 99% met a minimum UTS of 58 ksi." 

Grade 1

It is the most ductile and softest titanium alloy.It is a good solution for cold forming and corrosive environments. ASTM/ASME SB-265 provides standards for commercially pure titanium sheet and plate.

2nd grade

Pure titanium, standard oxygen.

2H level.

Unalloyed Titanium (Grade 2, minimum UTS 58 ksi).

Third grade

Unalloyed titanium, medium oxygen.

Grades 1-4 are unalloyed and considered commercially pure or "CP". Typically, the tensile and yield strengths of these "pure" grades rise with the grade.The difference in their physical properties is mainly due to the amount of interstitial elements.They are used in corrosion resistant applications where cost, ease of fabrication and welding are important.

Grade 5 is also known as Ti6Al4V, Ti-6Al-4V or Ti 6-4.Not to be confused with Ti-6Al-4V-ELI (Grade 23), which is the most commonly used alloy.Its chemical composition is 6% aluminum, 4% vanadium, 0.25% (maximum) iron, 0.2% (maximum) oxygen, and the balance titanium.It is much stronger than commercially pure titanium (grades 1-4), while having the same stiffness and thermal properties (excluding thermal conductivity, grade 5 Ti is about 60% lower than CP Ti).Among its many advantages, it is heat treatable.This grade is an excellent combination of strength, corrosion resistance, weldability and manufacturability.


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