Microstructure and mechanical properties of electron beam welded joints in different state of TC4

被引：0
作者：
Yan T. [1 ,2 ]
Cheng X. [1 ,2 ]
Li A. [1 ,2 ]
Tian X. [1 ,2 ]
Liu D. [1 ,2 ]
机构：
[1] National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering, Beihang University, Beijing
[2] School of Materials Science and Engineering, Beihang University, Beijing
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2019年 / 40卷 / 06期
关键词：
Electron beam welding; Laser additive manufacturing; Mechanical properties; Microstructure; TC4 titanium alloy;
D O I：
10.12073/j.hjxb.2019400164
中图分类号：
学科分类号：
摘要：
This paper studied the influence of a specification of electron beam welding on the structure of 'rolled+ laser deposited' TC4 welded joints, and analyzed the mechanical properties of the joints. Results show that on the rolled side, the microstructure of heat affected zone changes obviously, the shorter the distance away from welding center, the more amount of transformed β generates, and the columnar grain gradually transforms into equiaxed grain, with the appearance of clustered martensite α'. However, on the laser-deposited side, few changes are observed in the heat affected zone, β grain stays columnar, in which martensite α' generates, no equiaxed grain generates. The change trend of microhardness on both sides is similar, the closer the distance from the center, the higher the microhardness gets, the maximum hardness is around 400 HV found in the fusion zone. The mechanical properties of welded joints are similar to forged TC4, all the fractures locate in the laser-deposited base metal region. © 2019, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
引用
收藏
页码：112 / 117
页数：5
相关论文
共 14 条
  • [1] Li G.C., Li J., Tian X.J., Et al., Microstructure and properties of a novel titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si manufactured by laser additive manufacturing, Materials Science & Engineering A, 684, pp. 233-238, (2007)
  • [2] Niu C., Song X., Hu S., Et al., Effect of brazing temperature on the interfacial microstructure and mechanical properties of TC4/Ti60 brazed joints, Transactions of the China Welding Institution, 39, 6, pp. 77-80, (2018)
  • [3] Wang H., Zhang S., Wang X., Progress and challenges of laser direct manufacturing of large titanium structural components (Invited Paper), China Laser, 36, 12, pp. 3204-3209, (2009)
  • [4] Dirk H., Vanessa S., Eric W., Et al., Additive manufacturing of metals, Acta Materialia, 117, pp. 371-392, (2016)
  • [5] Zhu Y.Y., Tang H.B., Li Z., Et al., Solidification behavior and grain morphology of laser additive manufacturing titanium alloys, Journal of Alloys and Compounds, 777, pp. 712-716, (2019)
  • [6] Xu H., Yin L., Li J., Et al., Microstructure and properties of electron beam welded joints in TC4 titanium alloy, Transactions of the China Welding Institution, 26, 11, pp. 43-46, (2005)
  • [7] He W., Du X., Ma H., Et al., Determination and analysis of phase transition temperature of TC4 titanium alloy, Physical Testing and Chemical Analysis(Part A: Physical Testing), 50, 7, pp. 461-464, (2014)
  • [8] Yang J., Yu H., Han J., Et al., Transition temperature of TC4 alloy by laser selective melting forming, Journal of Material Heat Treatment, 37, 9, pp. 80-85, (2016)
  • [9] Zhou X., Huang Y., Chen Y., Et al., Laser joining of Mo and Ta sheets with Ti6Al4V or Ni filler, Optics and Laser Technology, 106, pp. 487-494, (2018)
  • [10] Li Z., Cheng X., Li J., Et al., Thermal expansion properties of laser melting deposited Ti-6. 5Al-2Zr-1Mo-1V alloy during α + β zone annealing, Materials Characterization, 128, pp. 115-122, (2017)
12