Effect of heat treatment on microstructure and mechanical properties of hot isostatic pressing TC21 titanium alloy
The TC21 titanium alloy thin-walled workpiece was prepared via the hot isostatic pressing(HIP)route,utilizing powder derived from the super-speed plasma rotating electrode process(SS-PREP).The influence of heat treatment on the microstructure and mechanical properties of the titanium alloy was thoroughly examined.The re-sults indicate that TC21 powder produced by the SS-PREP method exhibits commendable sphericity and remark-able compactness.Following hot isostatic pressing,the workpiece was found to be free of defects such as micro-cracks,pores,and heterogeneous inclusions.The microstructure of the TC21 alloy,formed through hot isostatic pressing,primarily consists of equiaxed α phase and lath α phase,along with a small fraction of β phase,while the powder boundary is predominantly equiaxed α phase.After the solution treatment and aging treatment,significant precipitation of the secondary acicular α phase occurs.As the aging temperature increases,this secondary α phase undergoes growth and coarsening,resulting in a decrease in the alloy's strength alongside an increase in ductility.Overall,the mechanical properties after solution treatment and aging treatment show a notable enhancement,sur-passing those of forging.
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