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Abstract：
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The effect of isothermal forging temperature on microstructure and mechanical properties of TC21 alloy forgings was studied by isothermal forging at the strain rate of 5.5×10-4s-1,deformation of 40%.The results show that the microstructure of TC21 is sensitive to forging temperature.The microstructure consists of primary α and transition β phase and when the alloy is deformed in α+β field,the volume fraction of primary equiaxed α decreases and its size increases with elevating temperature.Typical basketweave microstructure will be obtained when forging is made at the transition temperature,and the lamellar microstructure will be obtained in the β field.The tensile strength and fracture toughness are enhanced with elevating temperature,but the tensile ductility is reduced.When forging is made at 965℃,the thinner lamellar microstructure will be obtained,which possesses a good match among strength,plasticity and fracture toughness.965℃ is recommended for isothermal forging.
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