王湘宁,朱郎平,莫晓飞,等.TiAl合金粉末热等静压组织及其力学性能均匀性研究[J].精密成形工程,2022,14(1):55-61.
WANG Xiang-ning,ZHU Lang-ping,MO Xiao-fei,et al.Microstructure and Mechanical Property Uniformity of TiAl Alloy Powders Consolidated by Hot Isostatic Pressing[J].Journal of Netshape Forming Engineering,2022,14(1):55-61. |
| TiAl合金粉末热等静压组织及其力学性能均匀性研究 |
| Microstructure and Mechanical Property Uniformity of TiAl Alloy Powders Consolidated by Hot Isostatic Pressing |
| 投稿时间：2021-09-27 |
| DOI：10.3969/j.issn.1674-6457.2022.01.007 |
| 中文关键词: TiAl合金 粉末冶金 热等静压 显微组织 力学性能 |
| 英文关键词: TiAl alloy powder metallurgy hot isostatic pressing microstructure mechanical properties |
| 基金项目:国家科技重大专项(J2019-VII-0005-0145);国防基础科研(JCKY2017213B004) |
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| 摘要点击次数: 1933 |
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| 中文摘要: |
| 目的 研究圆柱包套经热等静压后内部不同位置粉末TiAl合金的组织与力学性能，为后续复杂结构包套热等静压整体成形工艺优化提供参考。方法 将装填有Ti-47Al-2Cr-2Nb雾化粉末的不锈钢包套在1230 ℃/170 MPa/3.5 h条件下热等静压，利用扫描电子显微镜观察烧结后包套内不同区域的显微组织，利用显微硬度计测量相应区域的显微硬度，最后选取芯部与靠近边缘组织测量室温与750 ℃的拉伸性能。结果 经扫描电镜观察，各区域组织均匀度为:芯部＞径向边缘/下端盖＞装粉口/边角处。其中，包套装粉口/边角区域组织存在球形γ相、PPBs以及大块α2相，而芯部组织分布更均匀。经显微硬度测试，边角处与装粉口显微硬度最低，分别为275.38HV0.2/10与280.23HV0.2/10;芯部显微硬度最高，为309.47HV0.2/10。芯部组织的室温、750 ℃拉伸性能均好于边缘组织。结论 包套直角结构对组织均匀性影响较大，圆柱包套不同部位组织形貌差异明显，芯部区域拉伸性能与显微硬度都更好。 |
| 英文摘要: |
| The work aims to study the microstructure and mechanical properties of TiAl alloy at different zones inside the cylindrical capsule prepared by powder hot isostatic pressing, so as to provide reference for the integral forming of capsule with complex structure by hot isostatic pressing. A stainless steel capsule filled with Ti-47Al-2Cr-2Nb atomized powder was hot isostatic pressed at 1230 ℃/170 MPa/3.5 h. The microstructure and microhardness of different zones in capsule after sintering were observed and measured by SEM and microhardness tester, respectively. The microstructures in core and near the edge were selected to measure the tensile properties at room temperature and 750 ℃. The uniformity order of the microstructure at each zone was:core>radial edge/bottom cover>filling port/corner zone. There were spherical γ phases, PPBs and large α2 phases in the microstructure at filling port/corner zone, while the core had more uniform microstructure. Through the microhardness test, the microhardness at filling port and corner zone was the lowest, 275.38HV0.2/10 and 280.23HV0.2/10 respectively. The microhardness in core zone was the highest, reaching 309.47HV0.2/10. Besides, the microstructure in core zone had better tensile properties than that near edge zone at room temperature and 750 ℃. The corner structures of capsules have a great impact on the microstructure uniformity. The microstructures in different zones of cylindrical capsule are obviously different, and the tensile properties and microhardness in core zone are better. |
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