Electron beam cold hearth single melted TC4 titanium alloy cast ingot head feeding process

Abstract

The invention discloses a single-time smelting TC4 titanium alloy ingot head feeding process on an electron beam cooling bed, which belongs to the technical field of titanium alloy ingot feeding technology and comprises the following steps: determining the ingot head to be fed; Once the metal liquid flows into the crystallizer, keep the current of 6-7# at 5.5A for 5 minutes; the current of 6-7# decreases from 5.0A to 0.5A in steps of 0.5A, and lasts for 5 minutes for each step down; Start with a current of 3.0A, narrow the scanning range of 6-7#; enlarge 6-7# to the edge until the molten pool disappears, and complete the feeding; after the feeding is completed, cool down. The invention has the advantages of simple process, convenient operation and good use effect, can effectively solve the defects in the head of the ingot, greatly improves the primary yield of the ingot, and can obtain obvious economic benefits.

Description

technical field [0001] The invention relates to a TC4 titanium alloy ingot head feeding process, in particular to an electron beam cooling bed single-melting TC4 titanium alloy ingot head feeding process, which belongs to the technical field of titanium alloy ingot feeding technology. Background technique [0002] For vacuum autoconsumption melting (VAR) melting of titanium and titanium alloys, at the end of melting, when the electrode has a certain weight remaining, the feeding process of the prior art generally adopts the method of gradually reducing the melting current and keeping the heat at a small current. In the feeding process, it is necessary to formulate the remaining electrode weight at the start of feeding, each level of current, voltage and time. As the feeding progresses, the remaining weight of the consumable electrode gradually decreases and tends to zero. However, the ingots produced by the above-mentioned feeding usually have large fluctuations in the rang...

AI Technical Summary

Problems solved by technology

Electron beam cooling bed single-melting TC4 titanium alloy ingot, if it is carried out according to the traditional feeding process, because the saturated vapor pressure of Al element is much higher than that of matrix elements, a large area of ​​volatilization loss of alloy element Al occurs during the smelting process, resulting in ingot head Part of the chemical composition can not meet the standard

If the feeding process is not carried out, it is easy to form casting defects such as risers and cross-section cracks

Generally, the method of cutting the head and tail is adopted to eliminate the influence of the defect on the subsequent processing, but this method will greatly reduce the yield of the ingot

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