Superplastic forming method of complex section ring part of TC11 titanium alloy

Abstract

The invention discloses a superplastic forming method of a complex section ring part of a TC11 titanium alloy. The superplastic forming method comprises the following steps: the TC11 titanium alloy is heated to 1030-1050 DEG C for undergoing one-way elongation with the total deformation being 20%-40%, and then is air-cooled; the TC11 titanium alloy is heated again to 950-980 DEG C for undergoing repeated upsetting and elongation with the total deformation being 40-65%, and then is air-cooled; the TC11 titanium alloy is kept at the temperature of 950 DEG C for 1.5 hours and then is air-cooled; the TC11 titanium alloy is kept at the temperature of 530 DEG C for 6 hours and then is air-cooled; a fine-grain TC11 titanium alloy blank is thus obtained, and then is heated to the forging temperature, and is upset, punched and leveled to obtain an alloy ring blank; and the rolling formation is performed at the temperature of 880-900 DEG C at the maximal feeding speed of 2.0 mm / s to obtain the complex section ring part of the TC11 titanium alloy. The method can enable the TC11 titanium alloy to be in a superplastic state in the forming process so as to obtain the complex section ring part of the TC11 titanium alloy; and the properties and the size of the complex section ring part both satisfy the requirements. The ring part, mainly serving as a connecting ring and a bearing ring, is widely applied to mechanical equipment of such industrial fields as the aviation field and the aerospace field.

Description

technical field [0001] The invention relates to a superplastic forming method, in particular to a superplastic forming method of a TC11 titanium alloy complex cross-section annular piece. Background technique [0002] Ring parts with complex cross-sections are widely used as connections, slewing support rings, bearing rings, etc. in large-scale mechanical equipment in aviation, aerospace, construction machinery, wind power, petrochemical and other industrial fields. This kind of ring has harsh service conditions, high requirements on its performance, and the structure of the ring is complex. It is difficult to meet the performance and size requirements of the ring at the same time by using the traditional forming method. [0003] Superplastic forming technology has been widely used in aviation, aerospace and other fields due to its advantages of low deformation resistance, high material plasticity, and the ability to precisely form complex parts at one time. At present, the...

AI Technical Summary

Problems solved by technology

At present, the research on the superplasticity of TC11 titanium alloy is limited to the tensile test of the material; and in the field of ring rolling, there has been no report on the superplastic forming of TC11 titanium alloy ring parts with complex cross-sections.

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