Alpha plus beta two-phase titanium alloy and method for processing same

Abstract

An alpha plus beta two-phase titanium alloy and a method for processing the same relate to an ultrahigh-strength weldable short-time heat-resistant (alpha plus beta) two-phase titanium alloy and a method for processing the same in the field of aerospace and armament. The alpha plus beta two-phase titanium alloy is characterized by comprising the following components by weight percent: 6.5%-7.9% of Al, 1.6%-2.6% of Sn, 1.6%-2.6% of Zr, 1.8%-2.8% of Mo, 0.9%-2.3% of Cr, 1.6%-2.6% of Nb, 0.8%-1.8% of Ni, no more than 0.5% of Si, no more than 0.20% of Fe, no more than 0.10% of C, no more than 0.10% of N, no more than 0.15% of O, no more than 0.015% of H, no more than 0.40% of other impurities and the balance of Ti. The titanium alloy can be welded through adopting an electronic beam welding method, and the strength coefficient after the welding can reach above 0.8. The titanium alloy is the ultrahigh-strength titanium alloy with the tensile strength which can reach above 1200 mega pascals at room temperature and reach the maximum magnitude of 1700 mega pascals; and the alloy has the electronic beam welding characteristic and the short-time heat resistance at high temperature of 600 DEG C.

Description

technical field [0001] A sort of A two-phase titanium alloy and a processing method thereof relate to an ultra-high-strength weldable short-time heat-resistant ( ) two-phase titanium alloy and its processing method. Background technique [0002] In the field of titanium production and application, the definition of ultra-high strength is: According to the general understanding of titanium alloys, titanium alloys classified according to room temperature tensile strength levels are classified into: low-strength titanium and titanium alloys ( R m <700MPa), medium-strength titanium alloy (700 MPa Rm< 850MPa), medium and high strength titanium alloy (850 MPa Rm< 1000MPa), high-strength titanium alloy (1000 MPa Rm< 1200MPa) and ultra-high strength titanium alloy ( R m 1200 MPa) five categories. The purpose of developing ultra-high-strength titanium alloys is to increase specific strength (ratio of strength to density), give full play to material p...

AI Technical Summary

Problems solved by technology

[0005] At present, the existing ultra-high-strength titanium alloys are mostly concentrated in the near or Titanium alloy; but since most of the or Titanium alloys have poor heat resistance, so they are limited to use below 300°C and do not have heat-resistant properties; currently, most of the existing heat-resistant titanium alloys are concentrated in or near Titanium alloys, but without ultra-high-strength properties; under appropriate conditions, ( ) Two-phase titanium alloys may have both ultra-high strength and heat resistance

At present, there are no official reports or patents on the room temperature tensile strength of rods or plates with an effective cross-section above 10mm reaching or exceeding 1600MPa~1700MPa.

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