Corrosion method for clearly displaying metallographic structure of cold-rolled alpha+beta type titanium alloy pipe

Abstract

The invention belongs to the technical field of titanium alloy metallographic structure observation, and particularly relates to a corrosion method for clearly displaying a metallographic structure of a cold-rolled alpha+beta type titanium alloy pipe. The technical problem to be solved by the invention is to provide the corrosion method for clearly displaying the metallographic structure of the cold-rolled alpha+beta type titanium alloy pipe. The method comprises the following steps of: a, adding hydrofluoric acid and water into a beaker, adding ammonium bifluoride, performing stirring until the ammonium bifluoride is completely dissolved, and conducting standing to obtain a solution A; b, adding concentrated nitric acid and concentrated sulfuric acid into the solution A, and sequentially adding oxalic acid and methanol to obtain a solution B; and c, soaking a ground and polished metallographic specimen into the solution B, conducting corroding, taking out the specimen, performing washing with clear water, and conducting blow-drying. By the adoption of the method, the corrosion effect of the metallographic structure of the cold-rolled titanium alloy pipe can be improved, the alpha+beta phase structure of the cold-rolled TC titanium alloy can be displayed more clearly, structure observation and subsequent phase identification are facilitated, and a positive effect is brought to detection work.

Description

technical field

[0001] The invention belongs to the technical field of titanium alloy metallographic structure observation, and in particular relates to a corrosion method for clearly displaying the metallographic structure of a cold-rolled α+β type titanium alloy pipe material. Background technique

[0002] With the development of science and technology, titanium alloys are used more and more, and the required supply status is also varied. The cold-rolled titanium alloy pipes (only for stress relief annealing) are due to their high dimension accuracy, good surface quality, The mechanical properties are qualified, and there are more demands. For cold deformed metals, the mechanical properties and metallographic structure in the direction of extension are the most basic inspection indicators.

[0003] The common cold-rolling process of TC titanium alloys is direct multi-pass cold rolling after the cast or forged bars are hot-rolled and pierced or bored and cut out. , elonga...

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