12 kinds of solution treatment+aging processes were designed to study the microstructure and mechanical properties of as-forged TC21 titanium alloy under different solution treatment(880-920 ℃)and aging temperatures(500-650 ℃).The results show that as the solution treatment temperature rises,there is a reduction in the primary α phase's volume and dimensions,leading to decreased ductility.At the same solution temperature,the change in aging temperature affects the content and size of the secondary α phase.With the aging temperature increasing,the dispersion degree of the secondary α phase increases,and the yield strength of the titanium alloy increases first and then decreases.When the aging temperature is too high,and reaches 650 ℃ the secondary α phase becomes coarse.Specimen is subjected only to solution treat at 920 ℃ for 2 h,Which exhibites a yield strength(Rp0 2)of 1107.0 MPa and a tensile strength(Rm)of 1238.5 MPa.The addition of subsequent aging treatment significantly enhances the yield and tensile strength.Especially,by solution treatment at 920 ℃ for 2 h followed by aging at 590 ℃ for 4 h,the as-forged TC21 titanium alloy achieves excellent comprehensive mechanical properties,with a yield strength(Rp02)of 1237.7 MPa and a tensile strength(Rm)of 1322.0 MPa.
TC21 titanium alloysolution treatment and agingmicrostructuremechanical properties
NETL
NSTL
万方数据
