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《Forging & Stamping Technology》 2010-01
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Study on isothermal forging temperature of high damage-tolerant titanium alloy

WANG Xiao-chen,GUO Hong-zhen,SHI Zhi-feng,WANG Yan-wei,YAO Ze-kun(School of Material Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)  
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.
【CateGory Index】: TG319
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