热处理对热等静压TC21合金粉末冶金件组织和性能的影响
Effect of heat treatment on microstructure and mechanical properties of hot isostatic pressing TC21 titanium alloy
李安 1王庆相 1樊玉鹏 2张艺丫 1赖运金 1李少强1
作者信息
- 1. 西安欧中材料科技股份有限公司,陕西西安 710018
- 2. 中国航发西安航空发动机有限公司,陕西西安 710021
- 折叠
摘要
以超高转速等离子旋转电极法(SS-PREP法)制备的高球形TC21合金粉末为原料,采用粉末热等静压工艺(HIP)制备出TC21钛合金薄壁件,重点研究了热处理制度对合金组织和力学性能的影响.研究结果表明:SS-PREP合金粉末球形度为99.65％,松装密度和振实密度达到理论密度的60％及68％,HIP后制件致密度良好,内部无微裂纹、气孔、异质夹杂等缺陷.HIP后合金组织由片状α、片层间β组织及少量细小等轴α晶组成粒.固溶时效处理后,β基体生成大量细小的针状次生α组织,随着时效温度的升高,次生α相发生长大粗化,合金的强度明显下降,塑性提高.固溶时效处理后,室温抗拉强达到1 317 MPa,较HIP态显著提高,并且优于锻件水平.
Abstract
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.
关键词
TC21粉末/热等静压/热处理/微观组织/力学性能Key words
TC21 powder/hot isostatic pressing/heat treatment/microstructure/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据