TA15钛合金高压及中压电子束焊接接头组织性能研究

Investigation on Microstructure and Mechanical Properties of High and Medium-Pressure Electron Beam Welded TA15 Titanium Alloy

分析了高压及中压两种电子束焊接条件下大厚度TA15钛合金焊接接头的显微组织及力学性能。通过光学显微镜及扫描电镜分析了焊接接头不同部位的显微组织形貌,并测试了不同焊后热处理条件下焊接接头的拉伸性能、冲击性能及疲劳性能。研究结果显示,通过焊后800℃退火处理,两种工艺下焊接接头的韧性获得了明显提高,焊接接头具有优异的强韧性匹配,并且焊接接头力学性能能够满足设计使用需求。

The microstructure and mechanical properties of high-thickness TA15 titanium alloy welded joints subjected to high-pressure and medium-pressure electron beam welding are investigated respectively. By the means of optical microscope and scanning electron mi- croscope, the mierostructure morphology of different parts of the welded joints is analyzed. Besides, tensile proper- ties, impact properties and fatigue properties of welded joints under different post-weld heat treatment conditions are tested, respectively. It is found that the toughness of welded joints with different welding processes increases obviously after 800℃ post-weld annealing treatment, moreover, the welded joint obtains excellent matching for strength and toughness, and its mechanical properties can meet the design requirements.