电焊机2025，Vol.55Issue(5)：89-93,5.DOI:10.7512/j.issn.1001-2303.2025.05.12
钛合金电子束焊接接头组织和性能分析
Microstructure and Mechanical Properties of Titanium Alloy Electron Beam Welded Joints
李晓强 1宋晓娇 1高健 1夏灵 1何明桓1
作者信息
- 1. 上海航天动力技术研究所,上海 201100
- 折叠
摘要
Abstract
To investigate the microstructural evolution of electron beam welded joints in dual-aged TC11,an α+β dual-phase titanium alloy widely used in aerospace applications,and its influence on mechanical properties,this study conducted vacuum electron beam welding experiments on cylindrical specimens with a wall thickness of 4.8 mm through optimized process parameters.The microstructure and mechanical properties of the welded joints were systematically characterized us-ing scanning electron microscopy(SEM),microhardness testing,and tensile testing.Results revealed that the primary α phase in the heat-affected zone(HAZ)exhibited irregular morphology due to thermal cycling near the α→β phase transfor-mation temperature,accompanied by β-phase precipitation.The fusion zone predominantly consisted of coarse lamellar transformed β-phase with a bamboo basket structure,characterized by unevenly distributed α-phase along grain boundaries.The distinct microstructural features resulted in a 16.7%increase in weld microhardness compared to the base metal,while tensile fractures consistently occurred in the base metal,indicating superior weld integrity.The optimized TC11 M vacuum electron beam welding process successfully achieved defect-free Class I welds with a tensile strength exceeding 1 030 MPa.This study provides theoretical insights and practical references for electron beam welding process design of medium-thickness titanium alloy components.关键词
钛合金/真空电子束焊/微观组织/力学性能/相变行为Key words
titanium alloy/vacuum electron beam welding/microstructure/mechanical properties/phase transformation分类
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李晓强,宋晓娇,高健,夏灵,何明桓..钛合金电子束焊接接头组织和性能分析[J].电焊机,2025,55(5):89-93,5.
