The β-type titanium alloy was originally the B120VCA alloy (Ti-13v-11Cr-3Al) developed by American Crucible in the mid-1950s. The β-type titanium alloy has good hot and cold processing properties, is easy to forge, can be rolled and welded, and can obtain high mechanical properties, good environmental resistance, and good combination of strength and fracture toughness through solution-aging treatment. The new high-strength and high-toughness β-type titanium alloys are representative of the following types: Ti1023 (Ti-10v-2Fe- # al), which is equivalent to the 30CrMnSiA high-strength structural steel commonly used in aircraft structural parts, and has excellent forging properties ; Ti153 (Ti-15V-3Cr-3Al-3Sn), the cold workability of this alloy is better than industrial pure titanium, the room temperature tensile strength after aging can reach more than 1000MPa; β21S (Ti-15Mo-3Al-2.7Nb-0.2Si ), The alloy is a new type of oxidation-resistant, ultra-high-strength titanium alloy developed by Timet Division of American Titanium Metal Company. It has good oxidation resistance, excellent cold and hot processing properties, and can be made into a foil with a thickness of 0.064mm; SP-700 (Ti-4.5Al-3V-2Mo-2Fe) titanium alloy developed by Japan Steel Pipe Corporation (NKK) has high strength, superplastic elongation of up to 2000%, and superplastic forming temperature is higher than Ti-6Al- 4V low 140 ℃, can replace Ti-6Al-4V alloy with superplastic forming-diffusion connection (SPF / DB) technology to manufacture various aerospace components; BT-22 developed by Russia (TI-5v-5Mo-1Cr-5Al ), Its tensile strength can reach more than 1105MPA.
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