| 摘要: |
| 针对钛合金焊缝金属易形成粗大柱状晶严重影响其性能的特点,利用电子束扫描焊接,对Ti 6Al 4V合金焊缝金属凝固组织及微观组织进行了研究。结果表明,当电子束扫描频率为0~200Hz时,焊缝凝固组织均为300μm以上粗大柱状晶;当电子束扫描频率为300~1000Hz时,焊缝凝固组织细化为100~300μm等轴晶。其中扫描频率为400Hz时,焊缝金属凝固组织得到最佳细化效果,晶粒尺寸为100μm,同时焊缝金属微观组织均匀细小。并分析了有关细化机理。 |
| 关键词: 电子束扫描 钛合金 焊缝金属组织 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Effect of scanning electron beam on solidified structure of welded Ti-6Al-4V alloy |
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ZHAO Hui1,2, HAN Zhong3, CHEN Xiao-feng3
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1.School of Materials Science & Engineering. Shenyang University of Technology, Shenyang 110023, China;2.School of Materials Science & Engineering, Shenyang Ligong University, Shenyang 110168, China;3.Shenyang National Lab for Materials Sciences & Engineering. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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| Abstract: |
| In view of coarse columnar B grains in welded Ti alloy,the effect of scanning electron beam on solidified structure and microstruc-ture of welded Ti-6AL-4V ally was studied.It was indicated that fine e-quiaxed 13 grains had been gained by certain scanning electron beam.For example,when scanning frequency is 400 Hz,the β grains were about100 Ixm.And metastable β phase are fine and uniform.The related re-finement mechanism was discussed. |
| Key words: scanning electron beam Ti-6Al-4V alloy solidified structure of weld metal |
