谭观华,王善林,张子阳,等.电子束焦点位置对TC4板材焊接接头显微组织的影响[J].精密成形工程,2018,10(5):16-21.
TAN Guan-hua,WANG Shan-lin,ZHANG Zi-yang,et al.Effects of Electron Beam Focus Position on Microstructure of TC4 Welds[J].Journal of Netshape Forming Engineering,2018,10(5):16-21. |
| 电子束焦点位置对TC4板材焊接接头显微组织的影响 |
| Effects of Electron Beam Focus Position on Microstructure of TC4 Welds |
| 投稿时间：2018-07-10 修订日期：2018-09-10 |
| DOI：10.3969/j.issn.1674-6457.2018.05.002 |
| 中文关键词: 板TC4 真空电子束 焦点位置 显微组织 |
| 英文关键词: TC4 plate vacuum electron beam focus position microstructure |
| 基金项目:国家自然科学基金（51461031）；轻合金加工科学与技术国防重点学科实验室基金（gf201501005） |
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| 中文摘要: |
| 目的 针对厚板TC4合金真空电子束焊缝组织不均匀的问题，通过改变不同焦点位置，分析焊接接头显微组织特征。方法 采用真空电子束对厚度为20 mm的TC4板进行对接试验，用光学显微镜和显微硬度计对焊缝不同位置的显微组织进行观察与分析。结果 采用表面聚焦时，可获得成形良好的“I”型焊缝；焊缝显微组织由柱状β相转变组织组成；表面聚焦状态下电子束流密度大，气孔较少，截面成形最好；接头显微硬度沿熔深方向上呈梯度分布，接头底部显微硬度最高，顶部硬度最低。结论 不同聚焦状态下焊缝中部晶粒存在较大差别，表面聚焦晶粒最为细小。接头沿熔宽方向上的显微硬度呈“W”型分布，沿熔深方向呈梯度分布。 |
| 英文摘要: |
| The paper aims to solve the problem of uneven structure of electron beam weld of TC4 alloy in thick plate and analyze the microstructure of welded joints by changing the position of different focal points. The TC4 plate with thickness of 20 mm was tested by vacuum electron beam. The microstructure of the weld was observed and analyzed by optical microscope and microhardness tester. The results showed that good "I" welds could be formed by surface focusing. The weld microstructure consisted of columnar beta phase transitions. The electron beam current density was large under the surface focusing state, the pores were less, and the cross-section was formed the best. The microhardness of the joint also showed a gradient along the depth of the penetration. The microhardness of the joint was the highest and the hardness of the top was the lowest. There are large differences in grain size in the middle of the weld under different focusing states, and the surface focused grains are the smallest. The microhardness of the joint in the direction of the melt width is "W"-shaped and distributed in a gradient along the depth of penetration. |
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