Effect of the surface condition of titanium alloy components on their working capacity after annealing in different atmospheres
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During annealing in vacuum furnaces with a specific air leakage rate of Qsp>13.3 mPa/sec, and also in furnaces with an argon atmosphere (with insufficient furnace sealing or with the use of unpurified argon), and with an air atmosphere, there is impregnation of surface layers with oxygen and carbon which leads to an increase in their microhardness, and as a result of this to a reduction in endurance and fatigue limit for alloy VT6.
Removal of the gas impregnated surface layers by etching or sand blasting of VT6 alloy specimens makes it possible to increase their endurance in cyclic tests by about a factor of ten and the fatigue limit by 30%.
KeywordsFatigue Titanium Furnace Surface Layer Titanium Alloy
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