Microstructure Evolution and Mechanical Properties of Electron Beam Welded Joint of Thick Plate TC4 Titanium Alloy

Caiyou ZENG; Xiaomei LIANG; Valerii Bilous; Sergii Akhonin; Khaskin Vladyslav; Caiyou ZENG; Xiaomei LIANG

doi:10.7512/j.issn.1001-2303.2022.06.10

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Microstructure Evolution and Mechanical Properties of Electron Beam Welded Joint of Thick Plate TC4 Titanium Alloy
Vol. 52, Issue 6, Pages: 87-92(2022)
DOI： 10.7512/j.issn.1001-2303.2022.06.10

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张宇鹏，丁来法，Valerii Bilous，等.厚板TC4钛合金电子束焊接头组织演变及力学性能［J］.电焊机，2022，52（6）：87-92.

ZHANG Yupeng, DING Laifa, Bilous Valerii, et al.Microstructure Evolution and Mechanical Properties of Electron Beam Welded Joint of Thick Plate TC4 Titanium Alloy[J].Electric Welding Machine, 2022, 52(6): 87-92.
张宇鹏，丁来法，Valerii Bilous，等.厚板TC4钛合金电子束焊接头组织演变及力学性能［J］.电焊机，2022，52（6）：87-92. DOI： 10.7512/j.issn.1001-2303.2022.06.10.

ZHANG Yupeng, DING Laifa, Bilous Valerii, et al.Microstructure Evolution and Mechanical Properties of Electron Beam Welded Joint of Thick Plate TC4 Titanium Alloy[J].Electric Welding Machine, 2022, 52(6): 87-92. DOI： 10.7512/j.issn.1001-2303.2022.06.10.

摘要

电子束焊因其真空环境、能量密度大、焊缝深宽比大等优点，被广泛应用于钛合金焊接。系统研究了30 mm厚TC4钛合金电子束焊接接头组织演化及其力学性能。结果表明：熔合区中部由粗大原始β柱状晶组成，内部为α,GB,、块状α集束和部分网篮组织构成的混合组织，靠近热影响区的熔合区由等轴原始β晶粒构成；热影响区存在较显著的组织不均匀性，随着距熔合区距离增大，β转变组织（次生α片层+残余β相）含量逐渐降低，初生α相含量逐渐升高；熔合区平均显微硬度比母材高约50 HV，接头抗拉强度达到906 MPa，接头强度系数达到96%，拉伸断裂位置位于熔合区内。

Abstract

In this paper, the microstructure evolution and mechanical properties of electron beam welded joints of 30 mm thick TC4 titanium alloy were systematically studied. The results show that the central part of the fusion zone is composed of coarse primary β columnar crystals, the interior is a mixed structure composed of grain boundary α phase, massive α cluster and part of the basket structure, and the fusion zone near the heat-affected zone is composed of equiaxed primary β grains. There is significant microstructure inhomogeneity in the heat-affected zone. As the distance from the fusion zone increases, the content of β-transition microstructure (secondary α-sheet + residual β-phase) gradually decreases, while the content of primary α-phase gradually increases. The average microhardness of the fusion zone is ~50 HV higher than that of the base metal, the tensile strength of the joint reaches 906 MPa, and the joint strength coefficient reaches 96%. The tensile fracture position is located in the fusion zone.

关键词

TC4钛合金厚板电子束焊接显微组织力学性能

Keywords

TC4 titanium alloythick plate electron beam weldingmicrostructuremechanical properties

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