Experimental method for electric pulse auxiliary regulation and control additive manufacturing near-[Beta] type titanium alloy metallographic structure

Abstract

The invention discloses an experimental method for an electric pulse auxiliary regulation and control additive manufacturing near-[Beta] type titanium alloy metallographic structure. The experimentalmethod comprises the following steps that: 1) through additive manufacturing, obtaining a cubic titanium alloy, processing a cylindrical titanium alloy sample of which two end surfaces are flat, and finally, polishing to remove an oxidation layer on the surface of the titanium alloy sample; 2) independently enabling tow end surfaces of the polished titanium alloy sample to be in complete contact with two electrodes of electric pulse processing equipment, regulating the current and the acting time of the electric pulse processing equipment, and carrying out electric pulse processing on the titanium alloy sample; and 3) cutting the titanium alloy sample subjected to the electric pulse processing, through a hot inlay method to prepare a metallographic specimen, polishing, buffing, cleaning and corroding the surface of the metallographic specimen, and utilizing a metallographic microscope and a field emission scanning electron microscopy to represent and analyze the change of an [Alpha] phase and a [Beta] phase before and after electric pulse processing. By use of the method, the additive manufacturing near-[Beta] type titanium alloy metallographic structure is changed and verified with small energy consumption and short time consumption, and the combination property of the additive manufacturing near-[Beta] type titanium alloy is improved.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to an experimental method for electric pulse-assisted regulation and additive manufacturing of near-β-type titanium alloy phase structure. Background technique [0002] Additive manufacturing (3D printing technology) is a technology based on digital models, using bondable materials such as powder metal, and using layer-by-layer printing to construct physical objects. It does not require machining or molds, and only uses computer software to make any Shaped parts can greatly shorten the product development cycle, reduce production costs, and improve efficiency. However, a large number of columnar β phases formed in the process of additively manufacturing near-β-type titanium alloys restrict the overall performance of the alloy, which not only limits additive manufacturing. The service life of formed parts also restricts the development of additive manufacturing techn...

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Problems solved by technology

[0002] Additive manufacturing (3D printing technology) is a technology based on digital models, using bondable materials such as powder metal, and using layer-by-layer printing to construct physical objects. It does not require machining or molds, and only uses computer software to make any Shaped parts can greatly shorten the product development cycle, reduce production costs, and improve efficiency. However, a large number of columnar β phases formed in the process of additively manufacturing near-β-type titanium alloys restrict the overall performance of the alloy, which not only limits additive manufacturing. The service life of formed parts also restricts the development of additive manufacturing technology and industry. In view of this problem, the current optimization method of titanium alloy phase structure mainly relies on heat treatment, adopting the method of heating and solid solution, heat preservation and water cooling, and then heat preservation. Although the heat treatment process can transform the phase structure of the near-β-type titanium alloy manufactured by additive manufacturing, it consumes a lot of energy and takes a long time to process.

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