郭震国,马铁军,李文亚,等.TA19/TB2异质钛合金线性摩擦焊试验研究[J].精密成形工程,2019,11(6):8-13.
GUO Zhen-guo,MA Tie-jun,LI Wen-ya,et al.Linear Friction Welded Dissimilar Joint of TA19 and TB2 Titanium Alloys[J].Journal of Netshape Forming Engineering,2019,11(6):8-13. |
| TA19/TB2异质钛合金线性摩擦焊试验研究 |
| Linear Friction Welded Dissimilar Joint of TA19 and TB2 Titanium Alloys |
| 投稿时间：2019-08-29 修订日期：2019-11-10 |
| DOI：10.3969/j.issn.1674-6457.2019.06.002 |
| 中文关键词: TA19 TB2 线性摩擦焊 微观组织 力学性能 |
| 英文关键词: TA19 TB2 linear friction welding microstructure mechanical properties |
| 基金项目:国家自然科学基金（51675435） |
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| 摘要点击次数: 3341 |
| 全文下载次数: 2356 |
| 中文摘要: |
| 目的 探究TA+TB钛合金组合的线性摩擦焊（LFW）接头组织及力学性能特点。方法 进行了TA19/TB2异质接头LFW焊接试验。利用光学显微镜及扫描电镜观察分析了接头微观组织特征，利用拉伸试验机及显微硬度计测试分析了接头力学性能。结果 TA19侧焊缝区为动态再结晶形成的等轴细晶组织，晶内析出了针状α'及细小片层α，热力影响区晶粒发生了不同程度的变形，在近焊缝较宽范围内形成水平流线形貌；接头中部界面TA19侧形成了直径约为2~3 μm的细小等轴晶；TB2侧焊缝区由动态再结晶形成的等轴晶及部分变形晶粒组成，热力影响区晶粒变形程度较低未形成流线形貌。接头界面两侧组织特征具有不同程度的强化效果，TA19侧从母材区到界面显微硬度值逐渐增大，TB2侧焊缝及热力影响区显微硬度值略高于母材；接头拉伸强度与TB2母材相当。结论 说明TA19与TB2钛合金可通过LFW获得可靠连接。 |
| 英文摘要: |
| The paper aims to study the microstructure and the mechanical properties of linear friction welded (LFW) joint of TA+TB titanium alloys. The welding experiment of TA19 and TB2 titanium alloys was carried out. By means of optical microscopy, scanning electron microscopy, tensile testing machine and microhardness tester, the microstructure characteristic and the mechanical properties of the joint were analyzed in detail. The results showed that the weld zone (WZ) of TA19 side was composed of fine equiaxial grains formed by dynamic recrystallization as well as acicular α' and small lamellar α precipitate from these grains. The grains of the thermo-mechanically affected zone (TMAZ) were deformed to different degrees and horizontal streamline morphology was formed in a wide region near the WZ. Some fine equiaxial grains with a size of 2-3 μm were formed near the middle interface in the TA19 side. The WZ of TB2 side was composed of equiaxed grains formed by dynamic recrystallization and some deformed grains. The streamline morphology was not formed in the TMAZ of TB2 side because of the slight deformed degree of the grains. In addition, the microstructure on both sides of the weld interface had different strengthening effects. The microhardness of TA19 side increased gradually from the base metal (BM) to the weld interface, the microhardness of the WZ and the TMAZ of TB2 side was slightly higher than that of the BM; the tensile strength of the joint was not lower than that of the BM of TB2. Therefore, TA19 and TB2 titanium alloys can achieve reliable connection through LFW. |
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