Machining method for improving obdurability of two-phase titanium alloy large-size bar

• Main Authors: MAO XIAONAN, GUO PING, HAN DONG, ZHAO YONGQING, HONG QUAN, JIA YUJU
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2013
• Subjects: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a machining method capable of improving the obdurability of a two-phase titanium alloy large-size bar, comprising the following steps of: 1, performing cogging forging on a two-phase titanium alloy cast ingot; 2, performing primary upsetting-drawing forging; 3, performing homogenization treatment; 4, performing secondary upsetting-drawing forging; and 5, performing annealing treatment on a finished product to obtain the two-phase titanium alloy large-size bar having a diameter of 250-450 mm. The two-phase titanium alloy large-size bar prepared by the machining method disclosed by the invention has a certain equiaxial alpha-phase content, original beta-crystalline grains are uniform and fine, and secondary alpha-strips are of a duplex organization structure with a certain length-width ratio, so that the flaw detection level of the large-size bar is raised while the strength and the fracture toughness of alloy is improved; and the two-phase titanium alloy large-size bar prepared by the ma