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| 焊后热处理对Ti17线性摩擦焊接头组织及力学性能的影响 |
| Effect of Post-Weld Heat Treatment on Microstructure and Mechanical Properties of Linear Friction Welded Ti17 Titanium Alloy Joint |
| Received:May 21, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.05.020 |
| 中文关键词: 线性摩擦焊 Ti17 焊后热处理 微观组织 力学性能 |
| 英文关键词: linear friction welding Ti17 titanium alloy post-weld heat treatment microstructure mechanical property |
| 基金项目:国家科技重大专项(2017-Ⅶ-0005-0098) |
| Author Name | Affiliation | | GUO Zhen-guo | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | MA Tie-jun | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | LI Ju | Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China | | LI Wen-ya | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | TANG Long-fei | Key Laboratory of Friction Welding Engineering Technology of Shaanxi Province, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 目的 获得双态组织Ti17钛合金线性摩擦焊接头合适的焊后热处理(PWHT)工艺，以满足该合金在航空发动机整体叶盘线性摩擦焊工程中的应用要求。方法 选用3种热处理温度(600，620，640 ℃)对接头进行PWHT，利用光镜(OM)及扫描电镜(SEM)观察分析接头微观组织，利用拉伸试验机及显微硬度计测试分析接头力学性能。结果 热处理后接头母材(BM)组织与焊态接头相比无明显变化，焊缝区(WZ)及热力影响区(TMAZ)内析出了细小的层片状二次α，使WZ及TMAZ的显微硬度与焊态接头相比均有所提高。随着热处理温度由600 ℃→620 ℃→640 ℃，WZ及TMAZ内二次α相逐渐长大粗化，导致WZ及TMAZ显微硬度随PWHT温度的升高而逐渐降低。结论 所选的PWHT温度可改善接头组织，使接头拉伸强度和断后伸长率均高于焊态接头及许用标准。 |
| 英文摘要: |
| In order to meet the engineering application requirements of linear friction welded (LFW) Ti17 titanium alloy blisk in aeroengine, the suitable post-welding heat treatment (PWHT) process of LFWed bimodal microstructure Ti17 titanium alloy joint was investigated. Three temperatures (600, 620, 640 ℃) were selected to carry out the PWHT. The microstructure of the joints was analyzed in detail by using an optical microscopy and a scanning electron microscopy; the mechanical properties of the joints were tested by means of a tensile testing machine and a microhardness tester. The results reveal that the base metal (BM) microstructure of PWHT joints is similar to that of as-welded joint; fine lamellar secondary α is formed in weld zone (WZ) and thermo-mechanically affected zone (TMAZ) of PWHT joints, which is contributed to the increase of microhardness compared with the WZ and TMAZ of as-welded joint. With the increase of PWHT temperature (600, 620, 640 ℃), lamellar secondary α in WZ and TMAZ grows and coarsens gradually, resulting in the decrease of microhardness. The PWHT conditions selected in this paper are beneficial to optimize the joint microstructure, which make the tensile strength and elongation of the PWHT joint higher than those of as-welded joint and allowable standard. |
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