The Process Study Of Electron Beam Cold Hearth Furnace Melting Pure Titanium Ingots

Titanium alloy owns low density, high specific strength and excellent high temperature and corrosion resistant properties, so it has been widely used in many fields, such as, aerospace, ships, metallurgy, chemical industry, electric power. With the rapid development of economic, the applying field and consumption of Ti alloy will be continuously increased.Because the increasing requirement on the aerospace field especially in aircraft engine, and the VAR’ inherent disadvantages on melting process which can not elimate the HDI and LDI effectively, the technology of EBCHM has been developed. EBCHM has three melting zones: raw materials melting zone, fine melting zone and solidification/crystallization zone.By using the theory of high temperature digestion and density separation, the HDI and LDI can be removed. Therefore, it can produce titanium alloy ingots without any inclusions.This paper has discussed the process of making pure titanium ingots using EBCHM. It has discussed the processing parameters’(raw materials, melting parameter, electron beam canning pattern and melting rate) influence on the ingots’ component and quality. Finally, the reasonable process will be confirmed and the qualified ingots which meet the requirement of GB/T 3620.1—2007 will be produced.In order to produce fine pure titanium ingots and keep the chemical component homogeneours, it focus on the control of raw materials and improving the ingot’s homogeneity:the defective materials in the experiments are dryin and without polluted; using U box and binding makes electrodes; using binding core materials and putting defective materials and electrodes blocks on horizontal direction uniform.The result shows that: the homogeneity of ingots has been improved.In order to improve ingots’ metallurgical quality, different scans have been taked according to different raw materials; the proper melting processing has been choosed by changing melting power, melting rate and dummy ingots speed. The result shows that ingots’ metallurgical quality can been guaranteed using those processing parameter.In the process of producing ingots, the relationship between the melting parameters and ingot’ chaminical component and quality has been discussed comparing the experiments’ result, the reasonable process route and main parameters have been confirmed. Based on this, titanium ingots witch has excellent metallurgical quality has been produced and the efficient has been up to 30%.