Mechanical properties of titanium and titanium alloys

The main measure to eliminate cold barriers or flow marks is to use the correct gating system to prevent two or more metal flows from converging, or turbulent and interrupted flow when liquid titanium is filling the mold. In gravity pouring, it is recommended to use bottom pouring system as much as possible, so as to avoid or reduce cold barriers or flow marks on the surface of castings as much as possible.

In order to obtain castings with a smooth surface and a complete filling, centrifugal casting is usually used. At this time, the flow rate of liquid titanium from the bypass into the cavity is very large, which is prone to strong splashing. It is very difficult to completely avoid cold barriers or flow marks. In this case, more attention should be paid to the process design of the castings, reasonable casting process, correct gating system, avoid reverse metal flow in the cavity, try to eliminate metal splash, and try to increase the molten metal if possible. The pouring temperature.

The influence of the wall thickness of titanium castings on the microhardness of the surface layer (the degree of surface contamination). For castings poured in the same mold, the thicker the casting, the more serious the contamination of the surface layer. For castings with wall thickness (greater than 10mm), it is not advisable to preheat the mold to an excessively high temperature before pouring. Some literature pointed out that when the wall thickness of the casting is below 10mm, the influence of the wall thickness of the casting on the surface roughness of the casting is not very obvious. The contamination layer on the surface of the casting is mainly caused by the interaction between titanium and the mold and the adsorption of a gas on the surface of the mold, of which oxygen is the most harmful.
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