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YAN Taiqi, CHENG Xu, LI An, TIAN Xiangjun, LIU Dong. Microstructure and mechanical properties of electron beam welded joints in different state of TC4[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(6): 112-117. DOI: 10.12073/j.hjxb.2019400164
Citation: YAN Taiqi, CHENG Xu, LI An, TIAN Xiangjun, LIU Dong. Microstructure and mechanical properties of electron beam welded joints in different state of TC4[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(6): 112-117. DOI: 10.12073/j.hjxb.2019400164
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Microstructure and mechanical properties of electron beam welded joints in different state of TC4

  • National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering, Beihang University, Beijing 100191, China;School of Materials Science and Engineering, Beihang University, Beijing 100191, China

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  • Received Date: August 19, 2018
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    • Abstract
  • 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.
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