Method for continuously casting titanium alloy near single-crystal ingot by using electromagnetic cold crucible

Abstract

A method of continuously founding the titanium alloy to be close to an single crystal ingot with a magnetic field belongs to a method of making the titanium alloy to be close to the single crystal ingot. The method solves the problem that the container material is easy to pollute the alloy and thus affect the physical and mechanical performances of the single crystal alloy during preparation of single crystal in the current directional solidification methods. The procedures of the invention are as follows: 1. vacuum pumping is conducted in a furnace (4), and then argon is re-charged. 2. induction coils (3) are arranged out of a water-cooled copper crucible (2), and spread on the outer surface of the water-cooled copper crucible (2). 3. a material rod (3) enters into the induction coils (3), the titanium alloy charge enters into the cavity of the water-cooled copper crucible (2), and the diameter of the upper part of the charge is small. 4. After heating, pulling is conducted, the feeding speed must strictly match with the pulling action; a rod enters into a crystallizer (9); the material rod forms close single crystal after pulling, and obtains the single crystal ingot after processing the outer layer. The invention realizes high-grade, high-efficiency, safety, special and low-cost single crystal preparation method for the titanium alloy material.

Description

technical field [0001] The invention relates to a preparation method of a titanium alloy single crystal ingot. Background technique [0002] A single crystal refers to a substance composed of a single grain, and the growth of the grain is properly controlled, and finally grows into a crystalline structure composed of one grain. Because the whole structure is one grain without grain boundary, it has better comprehensive performance or a certain unidirectional performance than directional solidification structure and polycrystalline structure. At present, single crystal materials are widely used [0003] Used in aerospace blades, semiconductor silicon electronic materials, magnetostrictive materials, GaAs crystal luminescent materials, intermetallic compounds and various metal-based and inorganic composite materials. Nickel-based single crystal materials are currently the main materials for manufacturing advanced aero-engine and gas turbine blades. In nickel-based single cr...

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Problems solved by technology

[0004] In order to solve the problem that the existing directional solidification methods are not applicable to the preparation of titanium alloy single crystals, this is due to the high activity of titanium alloys, which makes processing, forming and preparation relatively difficult, and the container material is easy to pollute the alloy when preparing single crystals. , the accuracy of the chemical composition of the alloy is poor, and the chemical inclusions are easy to erode the single crystal structure, affecting the physical and mechanical properties of the single crystal alloy, and the cooling rate is slow, so that the solidified structure has sufficient time to grow and coarsen, resulting in serious segregation , resulting in the lower performance of the material. In order to solve the above problems, a method for continuously melting and casting titanium alloy near-single crystal ingots using an electromagnetic cold crucible is now provided.

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