铸造技术2025，Vol.46Issue(2)：187-189,3.DOI:10.16410/j.issn1000-8365.2025.4213
热等静压工艺参数对TiAl-4522XD合金组织性能的影响
Effect of HIP Processing Parameters on the Microstructure and Mechanical Properties of TiAl-4522XD Alloy
摘要
Abstract
A prealloyed powder hot isostatic pressing(HIP)technique was utilized to fabricate a TiAl-4522XD alloy.The effects of HIP processing parameters(temperature and powder particle size)on the microstructure and mechanical properties of TiAl-4522XD alloys were investigated.Densification cannot be achieved at a HIP temperature of 1 200℃,with prior particle boundaries(PPBS)in the microstructure,resulting in a low matrix strength.At a HIP temperature of 1 260℃,complete densification is achieved,the PPBS disappears,and the tensile strength of the alloy significantly increases.When the hot pressing temperature is increased to 1 300℃,γ grains and borides rapidly grow,microcracks appear at the γ/α2 phase boundaries under thermal stress,and the tensile strengths at both room temperature and high temperatures decrease compared with those at 1 260℃.HIP samples with different particle sizes were fabricated at 1 260℃for 4 h.The results show that all the samples reached the theoretical density of the TiAl-4522XD alloy.For the particle size ranges of 150～212 and 45～212 μm,the deformation amount of powder particles is uneven,with microcracks present in the hot-pressed samples;for the particle size range of 45～150 μm,the hot-pressed samples have uniform and fine microstructures without obvious defects.Additionally,the vacuum degree during powder loading and degassing must reach 10-3 Pa;otherwise,it affects the density of the microstructure and the uniformity of powder deformation,leading to cracks at the PPBS.On the basis of these results,the optimal HIP process is achieved:the powder particle size range is 45～150 μm,and the HIP parameters are 1 260℃/4 h/10-3 Pa.Under these conditions,a uniform and dense near-γ microstructure is obtained,with a room temperature tensile strength of(698.0±2.0)MPa and a high-temperature tensile strength of(504.5±2.5)MPa.关键词
TiAl-4522XD合金/热等静压/组织/性能Key words
TiAl-4522XD alloy/hot isostatic pressing/microstructure/properties分类
矿业与冶金引用本文复制引用
黄海涛,杨超,张国栋,唐洪奎,张康..热等静压工艺参数对TiAl-4522XD合金组织性能的影响[J].铸造技术,2025,46(2):187-189,3.基金项目
中国航发自主创新专项资金项目(ZZCX-2020-007) （ZZCX-2020-007）
