Alpha+beta type titanium alloy

Abstract

The invention discloses an alpha plus beta type titanium alloy. The titanium alloy comprises the following components in percentage by weight: 7 to 8.5 percent of aluminum, 0.5 to 1.5 percent of vanadium, 1 to 3 percent of molybdenum, 1 to 3 percent of chromium, 0.3 to 1 percent of iron, 0.05 to 0.1 percent of rare earth element, the balance being titanium and inevitable impurities. The titanium alloy can be manufactured by common manufacturing methods for the titanium alloy such as the fusion casting pressure processing method and the powder metallurgic method. The total weight percentage of carbon, hydrogen, oxygen and nitrogen in the impurities is no more than 0.25 percent, and the vanadium is added in the form of aluminum-vanadium intermediate alloy, the molybdenum is added in the form of aluminum-molybdenum intermediate alloy, and the rare earth is added in the form of lanthanum-cerium mixed rare earth. Compared with Ti-6Al-4V, the room-temperature tensile strength and yield strength of the titanium alloy are improved by more than 30 percent, the high-temperature strength is also obviously enhanced, and the density and the cost are slightly lowered, so that the titanium alloy has more desirable performance-to-price ratio and wider market prospect.

Description

A kind of α+β type titanium alloy technical field The invention relates to a titanium alloy, in particular to an α+β type titanium alloy with high strength and superior cost performance. Background technique α+β-type titanium alloys are widely used in aviation, aerospace, automobiles, golf club heads, bicycles and other fields. Its typical representative is the Ti-6Al-4V alloy successfully developed in the United States in 1954. Ti-6Al-4V alloy has good comprehensive properties. At present, the usage of Ti-6Al-4V alloy has accounted for more than half of all titanium alloys. However, the cost performance of Ti-6Al-4V alloy is not high enough. The long-term working temperature is about 350°C. The higher V content in the alloy leads to higher price of the alloy, and its room temperature strength and high temperature strength need to be further improved, which limits the Ti-6Al-4V alloy. Further promotion and application of 6Al-4V alloy in national defense and civilian produ...

AI Technical Summary

Problems solved by technology

However, the cost performance of Ti-6Al-4V alloy is not high enough. The long-term working temperature is about 350°C. The higher V content in the alloy leads to higher price of the alloy, and its room temperature strength and high temperature strength need to be further improved, which limits the Ti-6Al-4V alloy. Further popularization and application of 6Al-4V alloy in national defense and civilian products