摘要: |
使用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和X射线衍射谱仪(XRD),研究了不同温度热处理后Ti-22Al-25Nb合金电子束焊接接头显微组织,对接头拉伸性能及断口分析后认为,经过850℃保温2h空冷的热处理可以有效地改善接头的室温和高温拉伸性能。 |
关键词: Ti-22Al-25Nb合金;电子束焊接;热处理;显微组织;力学性能 |
基金项目: |
|
The PWHT Process for Electron Beam Welded Joints of Ti-22Al-25Nb Alloy |
Zhu Ruican1, Wang Weirong1, Wang Guoqing2, Wang Wei1, Xu Wen1
|
1. Capital Aerospace Machinery Company, Beijing 100076;2. China Academy of Launch Vehicle Technology, Beijing 100076
|
Abstract: |
The post-weld heat treatment (PWHT) parameters of 800℃, 850℃and 900℃ were carried out. Aimed at the electron beam welding joints of Ti-22Al-25Nb alloy before and after the heat treatment, the tensile tests on room temperature and 650℃ were carried out. The microstructure, mechical properties of Ti-22Al-25Nb (at%) alloys welded joints were investigated by using the equipments optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The result shows that the mechanics performance of the joints with PWHT of 850℃ holding two hours followed cooling in air would get better. |
Key words: Ti-22Al-25Nb alloy;electron beam welding;heat treatment;microstructure;mechical properties |