Method for processing Ti-6Al-4V titanium alloy large size bar material

Abstract

The invention relates to a large-scale processing method of Ti-6Al-4V titanium alloy rod bars with the phi of 200-400mm and the length of over 3000mm. The technique is characterized by adopting Ti-6Al-4V titanium alloy casting ingots with the phi of 700-950 mm, a gas furnace for heating and heat preserving at 1150 DEG C, a hydraulic press for hammer cogging, and adopting multi-heating number smithing over the beta transition temperature with the whole smithing ratio not smaller than 3; heating and smithing below the beta transition temperature by 20-30 DEG C with a smithing ratio of 1.5-1.8; preserving the heat for 0.5-3 hours over the beta transition temperature by 20 DEG C, water cooling, performing homogenization treatment; finally heating below the beta transition temperature by 30-50 DEG C, performing multi-heating number smithing in the alpha+beta phase section to the finished product format and the total forging ratio of the alpha+beta phase section being not less than 6. The weight of a single rod bar is greatly improved through integral smithing of casting ingots / large-scale smithing stocks, the length of the rod bar can reach more than 3 m and the rod bars have favorable tissue and performance.

Description

technical field [0001] The invention relates to a method for processing Ti-6Al-4V titanium alloy large-scale rods, belonging to the technical field of titanium alloy materials, specifically Ti-6Al-4V titanium alloy with a diameter of 200-400 mm, a length of more than 3000 mm, and high requirements for structure and performance The processing technology of large-size bars, the products are mainly used in important applications such as aviation and aerospace. Background technique [0002] Titanium alloy has the advantages of high specific strength, strong corrosion resistance, excellent high temperature performance, good machinability, etc. It is an important material used in aviation, aerospace, weapons and other fields. The aviation industry is the main application field of titanium alloys. Ti-6Al-4V (the brand name in my country's national standard is TC4) is the alloy brand with the largest amount, accounting for about 70% of the total output of titanium alloys, and is mai...

AI Technical Summary

Problems solved by technology

However, the realization of upsetting and drawing forging relies on manual clamping to complete the operation, which is limited by the operation method of upsetting and drawing forging, which makes the production cycle of domestic Ti-6Al-4V titanium alloy Φ100mm and above bars long, and the unit weight of bars is small. Poor quality consistency, low level of ultrasonic flaw detection

At present, the maximum diameter of the bars produced and applied in industrialization is Φ220mm, and the length of a single bar is only about 1.5 meters, which is difficult to meet the needs of domestic and foreign aviation, aerospace, ships and other fields

Although many domestic units have carried out the research and development of bars with specifications above Φ220mm, they are still limited to the repeated upsetting and drawing forging technology of small billets, and it is difficult to increase the length of bars.

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