Hello,
In my experiment we are deforming pure titanium at high temperature (975 K) on Gleeble plastic deformation simulator. Samples are 10 mm in diameter and 12 mm in height. This is titanium grade 2. Unfortunately, just after temperature is reached the thermocouples are falling off. There is some sort reaction that cases places in which thermocouples are atached to melt. Has anybody had similar problem? Has anybody any idea what may cause such reaction?
Vadim Verlotski
Have you welded the thermocouple to the titanium sample and then heated the sample in air? It is possible that the thermocouple falls off due to oxidation of the titanium surface (welding point is oxidized). It would be better to insert the thermocouple into a deep hole in the sample.
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