Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C14/00—Alloys based on titanium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B34/00—Obtaining refractory metals
  • C22B34/10—Obtaining titanium, zirconium or hafnium
  • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
  • C22F1/18—High-melting or refractory metals or alloys based thereon
  • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Definitions

• a titanium alloy comprises, in weight percentages based on total alloy weight: 8.6 to 11.4 of one or more elements selected from the group consisting of vanadium and niobium; 4.6 to 7.4 tin; 2.0 to 3.9 aluminum; 1.0 to 3.0 molybdenum; 1.6 to 3.4 zirconium; 0 to 0.5 chromium; 0 to 0.4 iron; 0 to 0.25 oxygen; 0 to 0.05 nitrogen; 0 to 0.05 carbon; titanium; and impurities.
• incidental elements and impurities in the alloy composition may comprise or consist essentially of one or more of hydrogen, tungsten, tantalum, manganese, nickel, hafnium, gallium, antimony, silicon, sulfur, potassium, and cobalt.
• Certain non limiting embodiments of titanium alloys according to the present disclosure may comprise, in weight percentages based on total alloy weight, 0 to 0.015 hydrogen, and 0 up to 0.1 of each of tungsten, tantalum, manganese, nickel, hafnium, gallium, antimony, silicon, sulfur, potassium, and cobalt
• the aluminum content of titanium alloys according to the present disclosure may be about 3.0% to about 3.9%, by weight.
• the titanium alloy comprises an intentional addition of tin and zirconium in conjunction with certain other alloying additions such as aluminum, oxygen, vanadium, molybdenum, niobium, and iron. Without intending to be bound to any theory, it is believed that the intentional addition of tin and zirconium stabilizes the a phase, increasing the volume fraction of the a phase without the risk of forming embrittling phases it was observed that the intentional addition of tin and zirconium increases room temperature tensile strength while maintaining ductility.
• molybdenum if present, may be included for solid solution strengthening of the alloy and stabilization of beta phase.
• molybdenum may be present in any of the following weight
• the raw materials may include, but are not be limited to, titanium sponge or powder, elemental additions, master alloys, titanium dioxide, and recycle material.
• Recycle material also known as revert or scrap, may consist of or include titanium and titanium alloy turnings or chips, small and/or large solids, powder, and other forms of titanium or titanium alloys previously generated and re-processed for re-use.
• the form, size, and shape of the raw material to be used may depend on the methods used to melt the alloy.
• the material may be in the form of a particulate and introduced loose into a melt furnace.
• some or all of the raw material may be compacted into small or large briquettes.
• the raw' material may be melted to form one or more first melt electrode(s).
• the electrode(s) are prepared and remelted one or more times, typically using VAR, to produce a final melt ingot.
• the raw material may be plasma arc cold hearth melted (PAM) to create a 26 inch diameter cylindrical electrode.
• the PAM electrode may then be prepared and subsequently vacuum arc remelted (VAR) to a 30 inch diameter final melt ingot having a typical weight of approximately 20,000 lb.
• the final melt ingot of the alloy is then converted by wrought processing means to the desired product, which can be, for example, wire, bar, billet, sheet, plate, and products having other shapes.
• each billet and the bottom of the bottom-most billet at 7 inch diameter were sampled for chemistry and b transus. Based on the intermediate billet chemistry results, 2 inch long samples were cut from the billets and“pancake”-forged on the press. The pancake specimens were heat treated using the following heat treatment profile,
• the titanium alloy has an aluminum equivalent value of 6 0 to 9.0.
• the titanium alloy has a molybdenum equivalent value of 5.0 to 10 0
• the present disclosure also provides a titanium alloy comprising, in weight percentages based on total alloy weight: 8.6 to 11.4 of one or more elements selected from the group consisting of vanadium and niobium; 4.6 to 7.4 tin; 2.0 to 3.9 aluminum; 1.0 to 3.0 molybdenum; 1.6 to 3.4 zirconium; 0 to 0.5 chromium; 0 to 0.4 iron; 0 to 0.25 oxygen; 0 to 0.05 nitrogen; 0 to 0.05 carbon; titanium; and impurities.
• the titanium alloy comprises, in weight percentages based on total alloy weight, 1.0 to 2.0 molybdenum.
• the present disclosure also provides a titanium alloy consisting essentially of, in weight percentages based on total alloy weight: 2.0 to 5.0 aluminum; 3.0 to 8.0 tin; 1.0 to 5.0 zirconium; 0 to a total of 16.0 of one or more elements selected from the group consisting of oxygen, vanadium, molybdenum, niobium, chromium, iron, copper, nitrogen, and carbon; titanium; and impurities.
• a molybdenum content in the alloy is, in weight percentages based on total alloy weight, 0.1 to 5.0.
• a sum of vanadium and niobium contents is 6.0 to 12.0, or 6.0 to 10.0; a molybdenum content is 0.1 to 5.0; an iron content is 0.01 to 0.30; an oxygen content is 0.005 to 0.3; a carbon content is 0.001 to 0.07; and a nitrogen content is 0.001 to 0.03, all in weight percentages based on total weight of the titanium alloy.

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• Engineering & Computer Science (AREA)
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• Mechanical Engineering (AREA)
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• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
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• Crystallography & Structural Chemistry (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Manufacturing & Machinery (AREA)
• Powder Metallurgy (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Conductive Materials (AREA)
• Heat Treatment Of Steel (AREA)
• Materials For Medical Uses (AREA)
• Inverter Devices (AREA)
• Heat Treatment Of Sheet Steel (AREA)
• Laminated Bodies (AREA)

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