Processing method for effectively reducing anisotropy of cold-rolled titanium tape

Abstract

The invention discloses a processing method for effectively reducing the anisotropy of a cold-rolled titanium tape, which comprises the following steps: carrying out complete recrystallization annealing on a GR1 or GR2 cold-rolled titanium tape which is cold-rolled to a target thickness or close to the target thickness, wherein the crystalline grain diameters of different parts of the titanium tape subjected to annealing are sequentially controlled at 40-65 mu m in the GR1 cold-rolled titanium tape and 10-20 mu m in the GR2 cold-rolled titanium tape; and feeding the cold-rolled titanium tape into a common cold-rolling mill, and under the conditions that the rolling speed is 15-50 m/min, the uncoiling unit tension is 2-10 kg/mm<2>, and the winding unit tension is 3-15 kg/mm<2>, in a constant rolling force control mode, carrying out dry planishing on the pure titanium tape directly by using a working roll on the common cold-rolling mill, and controlling the rolling reduction. According to the invention, the anisotropy of the cold-rolled titanium tape is obviously reduced, the difference between transverse and longitudinal yielding-to-tensile ratios of the GR1 cold-rolled titanium tape is reduced from 26.8% to 11.1%, and the difference between transverse and longitudinal yielding-to-tensile ratios of the GR2 cold-rolled titanium tape is reduced from 16.2% to 3.8%; and in addition, the evenness of a titanium plate subjected to planishing is significantly increased in comparison with that before annealing, and the unevenness can be up to 3 mm/m, therefore, the titanium plate is good in processing formability.

Description

technical field [0001] The invention relates to a material processing technology, in particular to a processing method for effectively reducing the anisotropy of cold-rolled titanium coils. Background technique [0002] my country's titanium industry started late, and there is a big gap in the development and application of titanium compared with foreign countries. Although my country has established a relatively complete titanium industrial system, the production of titanium coils has not yet formed a large-scale production. The production technology of titanium coils is not fully mastered, the equipment is not matched, the degree of automatic control of the rolling process is low, the production capacity and output are low, and the production process is low. relatively backward. The production of foreign titanium coils is generally carried out in special steel mills using hot continuous rolling mills to roll to 2~3mm thick titanium coils, and then rolled to the finished si...

AI Technical Summary

Problems solved by technology

[0003] Titanium is a metal with a close-packed hexagonal structure with few slip systems and poor symmetry. It is inevitable to produce crystal preferred orientation during processing or deformation, and the titanium coil cannot achieve commutation during the entire rolling process. Rolling, which directly leads to a huge difference in deformation of cold-rolled pure titanium coils along the rolling direction (longitudinal) and perpendicular to the rolling direction (transverse) during processing, and the rolled plate has obvious anisotropy. Even after good annealing, there are still obvious differences in the transverse and longitudinal mechanical properties of the plate, which reduces the processing and forming performance of the titanium plate, such as quality problems such as ear making or poor deep drawing performance.

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