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What are the advantages of induction melting technology for titanium alloy forgings and titanium alloy flanges?

The widely used melting method in China's industry is vacuum consumable electrode arc melting. Although it can effectively ensure that the alloy liquid has a certain degree of superheat and a relatively accurate composition of the alloy melt, this method requires extremely high quality of the raw material electrode, and the surface area of the melt pool is large and the depth is small, causing significant volatilization loss of high vapor pressure elements (such as A1 element), which is not conducive to controlling the alloy composition.

The induction melting method for water-cooled copper crucibles involves placing copper crucibles that are divided into sections and cooled by water under an induction electromagnetic field for melting, which can maximize the advantages of the induction melting method. There is a solid shell layer formed by the solidification of titanium melt between the water-cooled copper crucible and the metal melt, which is called a solidified shell. At this point, the inner lining of the crucible is equivalent to being made of the molten metal, that is, the inner surface of the crucible has the same composition as the molten metal, avoiding contamination of the crucible with the molten metal. With the increase of the number of cold crucible combination blocks and the input power of the power supply, the strong magnetic field promotes the rapid melting of the furnace material and generates a strong stirring effect, making the temperature and composition of the metal melt uniform and achieving consistent superheat. Due to the complex composition of new titanium alloys and TiAl compound alloys, the allowable deviation of alloy element content is small. It is difficult to meet the requirements for alloy composition using the commonly used arc melting method of titanium alloys. Water cooled crucible induction melting is particularly suitable for this type of work. The melted alloy composition is uniform, and the superheat of the alloy liquid with appropriate interstitial element content meets the requirements of static and centrifugal casting.

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