Research on Microstructure and Mechanical Properties of Electron Beam Welded Joints of 12 mm Thick TC11 Titanium Alloy

LIU Haikun; ZHAO Jian; HAN Ke; LIU Hangtian; WANG Qun

doi:10.7512/j.issn.1001-2303.2025.03.07

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Research on Microstructure and Mechanical Properties of Electron Beam Welded Joints of 12 mm Thick TC11 Titanium Alloy
Vol. 55, Issue 3, Pages: 58-64(2025)
Received：14 June 2024，

Revised：2024-12-11，

Published：20 March 2025
DOI： 10.7512/j.issn.1001-2303.2025.03.07
稿件说明：

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刘海坤，赵健，韩柯，等.12 mm厚TC11钛合金电子束焊接接头组织及力学性能研究［J］.电焊机，2025，55（3）：58-64. DOI： 10.7512/j.issn.1001-2303.2025.03.07.

LIU Haikun, ZHAO Jian, HAN Ke, et al.Research on Microstructure and Mechanical Properties of Electron Beam Welded Joints of 12 mm Thick TC11 Titanium Alloy[J].Electric Welding Machine, 2025, 55(3): 58-64. DOI： 10.7512/j.issn.1001-2303.2025.03.07.

摘要

采用高压真空电子束焊机对12 mm厚TC11钛合金板进行焊接，利用X射线检测仪对焊缝内部质量进行检测，使用超景深显微镜对焊接接头显微组织进行观察，分析不同组织的分布规律，通过拉伸试验、显微硬度对力学性能进行测试，借助扫描电镜对显微组织与拉伸断口形貌进一步观察。结果表明，真空电子束焊接接头成形良好，TC11钛合金母材组织有两种不同尺寸的等轴α相镶嵌在β基体，焊缝熔合线附近交替分布着针状马氏体α'，在焊缝中出现不同角度的片状α相，等轴β相与片状α相组成的亚稳态组织，以及出现一条由亚微米级等轴β相组成的细晶带；焊缝与热影响区显微硬度略高于母材区，焊缝中部硬度略高于焊缝上部与下部；拉伸试样均断裂于焊缝处，抗拉强度低于母材；断口形貌为韧窝状，为典型的韧性断裂。

Abstract

The 12 mm thick TC11 titanium alloy plate was welded by electron beam welding machine

and the internal quality of the weld was examined by X-ray detector

the welded joint was observed by super depth-of-field microscope to analyze the distribution pattern of different tissues

and the mechanical properties were tested by tensile test and microhardness

and further observed by scanning electron microscope on the microstructure and fracture morphology. The results show that the welded joint are well formed

the TC11 titanium alloy base metal organization has two different sizes of equiaxial α-phase embedded in the β matrix

the fusion line near the alternating distribution of acicular martensite α'

in the weld appears at different angles of the lamellar α-phase

equiaxial β-phase and lamellar α-phase composed of the metastable state microstructure

as well as the emergence of a sub-micron level equiaxial β-phase composed of a fine crystalline band; welded seam zone and heat-affected zone microhardness Slightly higher than the base metal area

welded seam middle hardness is slightly higher than the weld upper and lower; tensile specimens are fractured in the welded seam

the tensile strength is lower than the base material; The fracture morphology is tough fossa-like

typical of toughness fracture.

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Keywords

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