航空材料学报Issue(1)：7-11,5.DOI:10.11868/j.issn.1005-5053.2016.1.002
定向层片组织铸造 TiAl 合金的热等静压温度选择
Optimization of Hot Isostatic Pressing Temperature for Cast TiAl Based Alloy with Directional Lamellar Microstructure
朱春雷 1王红卫 2韩波 3张熹雯 1易健宏3
作者信息
- 1. 钢铁研究总院 高温材料研究所，北京 100081
- 2. 兰州理工大学 材料科学与工程学院，兰州 730050
- 3. 昆明理工大学 材料科学与工程学院，昆明 650093
- 折叠
摘要
Abstract
The effect of hot isostatic pressing temperature on lamellar breakdown behavior and RT tensile properties was studied for a cast TiAl based alloy with directional lamellar microstructure by conventional casting,in order to optimize the temperature of hot isostat-ic pressing (HIP)for the special lamellar microstructure.After HIP at 1250 ℃,excessive equiaxed γgrains were precipitated along the colony boundary or in the colony,which resulted in reduction of tensile strength at RT.After HIP at 1290 ℃,breakdown of lamellar was occurred by coarsening of lamellar and formation of secondary lamellar with random orientation.Formation of the secondary lamellar resulted in instability of tensile properties at RT.After HIP at 1270 ℃,less equiaxed γgrains were precipitated and secondary lamellar did not generated,so the better integrality of lamellar and uniformity of lamellar orientation were kept by the microstructure obtained, and also the best tensile properties and good stability were achieved.Finally,HIP at 1270 ℃ is good for the directional lamellar micro-structure.关键词
铸造TiAl合金/定向层片/热等静压/二次层片/拉伸性能Key words
cast TiAl alloy/directional lamellar/hot isostatic pressing/secondary lamellar/tensile properties分类
矿业与冶金引用本文复制引用
朱春雷,王红卫,韩波,张熹雯,易健宏..定向层片组织铸造 TiAl 合金的热等静压温度选择[J].航空材料学报,2016,(1):7-11,5.
