VT9 alloy made of titanium
Titanium grades are classified according to crystal lattice configuration: cubic (β-state), in a form of hexahedron (α-state), mixed (α + β). Titanium gost VT9 refers to a group of α + β alloys. It is alloyed with aluminium — 6.4%, molybdenum — 3%, zinc — 1.5%, silicon — 0.25%. It is invented in 1960 by VIAM. This alloy is a first thermally hardened alloy that has been utilized in industry. The highest strength properties are achieved at temperature of up to 500 ° C.
Chemical composition of alloy according to GOST 19 807- 91
|5.8 -7.5||≤0.05||≤0.015||86.15−89.9||0.2 — 0.35||≤0.1||≤0.25||1−2||≤0,15||2−3|
Note: titanium is a basis; its percentage is noted in a table. Impurities are permissible to 0.3%.
|Volume weight||Properties||t° of melting||Application||Manufacturing process|
|4,48 g/cm³||A high percentage of aluminium and silicon doping increases a strength, heat resistance in comparison to titanium grade 5. It is intended to work at temperature of 400 — 500 °C. Combination of qualities ensures isothermal and double annealing. Content of β — phase in annealed alloy is 10%. Alloys are hardened by age-hardening and thermohardening.||980−1020°||Gas-turbine engines: blades and discs, parts of compressors etc.||It is satisfactorily deformed in a hot condition. During cold pressure treatment, workability is worse in comparison to titanium grade 5. Welding is not recommended.|
Rod, sheet, wire, tube made of this titanium grade are widely used in aircraft, petrochemical engine industry for manufacture of compressors details, pumps, pipelines, parts of gas turbine engines that operate at a temperature of 400 — 500 °C.
|Temperature at which are obtained actual characteristics °С||20°С|
|Heat conduction coefficient t° 200 °C [1/ °С]||10.5|
|Elasticity module of 1 sort Е [MPa] x 10-5||1.18|
|Short-term strength limitsв [MPa] Bar, GOST 26 492−85||930−980|
|Short-term strength limitsв [MPa] Bar, higher quality GOST 26 492−85||980−1230|
|Specific electric resistance Оhm-mm2/m||R|
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