Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness

WANG Xiangyu; GONG Shuili; YANG Jing

doi:10.16080/j.issn1671-833x.2016.23/24.104

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Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness

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- Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness
- Aeronautical Manufacturing Technology Vol. 59, Issue 23/24, (2016)
- 作者机构：
  
  中航工业北京航空制造工程研究所高能束流加工技术重点实验室,北京,100024
- 作者简介：
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- DOI：10.16080/j.issn1671-833x.2016.23/24.104
  CLC：
- Published：2016
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王翔宇，巩水利，杨璟，芦伟，单飞虎. TC4 钛合金激光窄间隙焊接工艺与组织特征研究[J]. 航空制造技术, 2016, 59(23/24): 104-107. WANG Xiangyu, GONG Shuili, YANG Jing, LU Wei, SHAN Feihu. Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness. Aeronautical Manufacturing Technology, 2016, 59(23/24): 104-107.

WANG Xiangyu, GONG Shuili, YANG Jing. Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness[J]. Aeronautical Manufacturing Technology, 2016, 59(23/24).
王翔宇，巩水利，杨璟，芦伟，单飞虎. TC4 钛合金激光窄间隙焊接工艺与组织特征研究[J]. 航空制造技术, 2016, 59(23/24): 104-107. WANG Xiangyu, GONG Shuili, YANG Jing, LU Wei, SHAN Feihu. Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness. Aeronautical Manufacturing Technology, 2016, 59(23/24): 104-107. DOI： 10.16080/j.issn1671-833x.2016.23/24.104.

WANG Xiangyu, GONG Shuili, YANG Jing. Narrow-gap|TC4 titanium alloy|Laser welding|Microstructure|Microhardness[J]. Aeronautical Manufacturing Technology, 2016, 59(23/24). DOI： 10.16080/j.issn1671-833x.2016.23/24.104.

摘要

使用IPG YLS-5000 多模光纤激光器实现了12mm 厚TC4 钛合金光纤激光窄间隙焊接，优化了焊接工艺，并对焊缝组织和显微硬度进行了分析。结果表明：激光窄间隙焊接容易产生气孔和侧壁未熔合缺陷，优化后的焊接工艺能显著减少气孔并消除未融合缺陷。母材显微组织为典型的等轴组织，焊缝区显微组织由粗大的β 柱状晶和网篮状马氏体α' 组成。热影响区晶粒尺寸明显细化。热影响区组织由细小的针状马氏体α'、转变α 组织和β转变组织构成。焊缝区和热影响区的显微硬度高于母材，近焊缝热影响区显微硬度达到最大值。

Abstract

The IPG YLS-5000 multi-mode fiber laser is used for the 12mm thick TC4 plate by the multiple-pass narrow-gap approach. Optimized process parameters are attained

as well as the microstructure in laser beam welds of TC4 titanium alloy is investigated. The result shows that incomplete fusion and porosity could be reduced using the optimized welding parameters. The microstructure of the base metal (BM) is typical equiaxed structure. The microstructure of fusion zone (FZ) is composed of β columnar crystal and basket weave martensite α′ phase. The grain size of heat affected zone (HAZ) is obviously refined. The HAZ partially transformed is made up of martensite α′ phase

transformed α and transformed β. Moreover

the microhardness of weld metal and heat affected zone is higher than that of base metal

and the hardness reaches to peak value in the heat affect zone near weld metal.

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