Production process method of ultrahigh-strength TA4 titanium alloy thin strip

Abstract

The invention provides a multi-rolling-stroke mode formed by alternating stepped deformation repeated cold rolling and multiple times of online continuous solid solution stepped annealing. A TA4 titanium alloy strip is treated in the multi-rolling-stroke mode, and then a titanium alloy thin strip with the tensile strength larger than or equal to 700 Mpa, the yield strength larger than or equal to 600 Mpa and the elongation larger than or equal to 15% is obtained; and under the condition that the elongation of the TA4 titanium alloy thin strip is guaranteed, the tensile strength and the yield strength of the TA4 titanium alloy thin strip are effectively improved, the use requirements of high-end equipment are met, and high application and popularization value is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production process method of an ultra-high-strength TA4 titanium alloy strip. Background technique [0002] TA4 / Grade4 titanium alloy strip is a medium-strength titanium alloy strip that is widely used in aerospace engineering in the world. It is also a key material for consumer electronics and other industries, especially high-end smart phones. According to the needs of the application field, it is hoped that the comprehensive mechanical properties of TA4 / Grade4 alloy strip and foil will be further improved to meet the following requirements: tensile strength≧700Mpa, yield strength≧600Mpa, elongation≧15%, that is to say, the required material The bottom line of tensile strength and yield strength is increased by 150Mpa and 117Mpa respectively, and the elongation must also be maintained at the original index level. [0003] However, the tensile strength and yiel...

AI Technical Summary

Problems solved by technology

[0005] The traditional TA4 / Grade4 titanium alloy thin strip production method is also carried out by rolling and vacuum annealing or bell annealing, but since the rolling is carried out according to the basic proportional deformation, the usual vacuum annealing or bell annealing is also It cannot solve the problem of rapid cooling and solid solution during the annealing process, so the influence on the processing structure of the material cannot be created to increase the strength while ensuring that the elongation is not reduced, so the traditional production method cannot improve the TA4 / Grade4 titanium alloy thin strip. strength index, and it cannot be guaranteed that its elongation rate will not decrease; therefore, in summary, it is necessary to improve

Images