Effect of Heat Treatment Process on Microstructure and Mechanical Properties of Large Size TC17 Titanium Alloy Bar
Effects of solution temperature,cooling method,holding time and sampling direction on the microstructure and mechanical properties of large size TC17 titanium alloy bar were studied,and the best heat treatment was selected according to the experimental results.The results show that the optimum heat treatment process of TC17 titanium alloy is 800℃/2 h/WQ+630℃/8 h/AC.Heat treatment in α+β phase zone and the same cooling conditions,the strength of the alloy increases and the plasticity decreases with the increasing of solution temperature within the two phase region.The strength of the alloy is higher and the plasticity is lower after solid solution treatment followed by air cooling and aging than that after solid solution treatment followed by water cooling and aging at the same temperature.The ductility of the alloy can be improved by shortening solution holding time under the same temperature and water cooling.The large size TC17 titanium alloy bar after being forged exists anisotropism.
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