When the hydrogen content in the titanium rod is too much, the impact toughness and notch elongation will drop sharply due to brittleness, so it is generally stipulated that the hydrogen content in the titanium rod should not exceed 0.015%. In order to reduce the amount of hydrogen absorbed, the parts are heat treated Fingerprints, rolling mill marks, grease and other residues should be removed before heating, and there is no water vapor in the atmosphere in the heat treatment furnace. If the hydrogen content of the titanium rod exceeds the allowable value, it should be removed by vacuum annealing. Vacuum annealing for dehydrogenation is generally maintained at 538-760°C for 2-4 hours at a pressure lower than 0.066Pa.
When the temperature does not exceed 540°C, the oxide film on the surface of the titanium rod will not be significantly thickened, and at a higher heat treatment temperature (above 760°C), the oxidation rate will be accelerated sharply, and oxygen will expand into the material to form a diffusion layer. pollution layer. Oxygen contamination layer has a high brittleness ratio and causes cracks and damage to the product surface.
Mechanical processing methods (such as sand blasting, room cutting, etc.) to remove oxygen from the contaminated layer, or chemical methods such as pickling, chemical milling, etc., during heat treatment, the heating time should be shortened as much as possible under the premise of ensuring heat treatment of meteorites, or in vacuum furnace or inert gas (argon, nitrogen, etc.) heating furnace. Appropriate application can also avoid or reduce the pollution generated when titanium rod parts are heated in an air furnace.
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