等温锻造和双重退火对TC11钛合金显微组织和力学性能的影响

Effect of Isothermal Forging and Duplex-Annealing on Microstructure and Mechanical Properties of TC11 Titanium Alloy

研究了α+β相区等温锻造和双重退火工艺对TC11钛合金显微组织和力学性能的影响。结果表明,等温锻造温度越高,β转变组织含量越高,双重退火后合金强度越高。高温退火温度高于锻造温度会提高β转变组织含量,从而提高强度;高温退火温度低于锻造温度会造成次生α相的粗化,不利于强度提高。获得合金高强度的关键在于获得足够比例的β转变组织,并使得其中的次生α相细小、不粗化。

The effects of isothermal forging in α +β zone and duplex-annealing processes on the microstructure and mechanical properties of TC11 titanium alloy were studied. The results show that the higher the isothermal forging temperature, the higher the content of β-transformation structure and the higher the strength of the alloy after duplex-annealing. When the annealing temperature is higher than the forging temperature, the content of β-transformation structure will be increased and the strength will be improved;when the annealing temperature is lower than the forging temperature, the secondary α phase will be coarsened, which is not conducive to improve ment of the strength. The key to obtain high strength of the alloy is to obtain a sufficient proportion of β-transformation structure and make the secondary αphase fine and not coarse.