TC4合金β转变温度测定及力学性能研究
Measurement of β Transformation Temperature and Study on Mechanical Properties of TC4 Alloy
李亚非 1佟飞 2霍荣伟 2刘通1
作者信息
- 1. 张家界航空工业职业技术学院,湖南 张家界 427000;长沙理工大学,湖南 长沙 410100
- 2. 张家界航空工业职业技术学院,湖南 张家界 427000
- 折叠
摘要
对粉末热等静压+热挤压工艺成型的TC4 合金进行显微组织观察,并参照标准HB 6623.2-1992 进行β转变温度测定.结果表明,TC4 合金的显微组织致密度高,热变形后细小片层组织发生部分网篮化转变.该组织初生α相含量极少,因此无法通过检测不同加热温度下初生α相含量来测定β转变温度.但通过检测α片层的固溶度,可大致判定β转变温度为 990℃.拟定TC4 合金的热处理工艺为980℃×1 h,空冷,并检测其力学性能.由于细小片层组织的强韧化作用,热等静压+热挤压工艺成型的TC4 合金的拉伸强度、冲击韧性和断裂韧度指标均优于传统热成型TC4 合金,但其拉伸塑性略差.
Abstract
The microstructure of TC4 alloy formed by powder hot isostatic pressing and hot rolling technology was tested,and the β transformation temperature was measured according to HB 6623.2-1992 standard.The results showed that the microstructure of TC4 alloy was highly compact and the fine lamellar underwent a partial net-basket transformation dering thermal deformation.The primary α-phase content was less and it was not suit to determining β transition temperature by detecting its content at different heating temperatures.However,by detecting the solid solubility of the α lamellae,the β transformation temperature could be roughly determined to be 990℃.The proposed heat treatment process of TC4 alloy was 980℃×1 h and air cooling.Testing the mechanical properties of the specimens found that the tensile strength,impact toughness and fracture toughness of TC4 alloy which famed by hot isostatic pressure and hot rolling were better than those of the traditional hot forming TC4 alloy due to the strong toughening effect of the fine lamellar microstructure,but the tensile plasticity was a little inferior.
关键词
TC4合金/β转变温度/力学性能Key words
TC4 alloy/β transformation temperature/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据