超窄间隙激光焊接TC4钛合金接头组织及性能研究

作者:崔冰;张华;赵常宇;邵童阁; 刊名:材料导报 上传者:李德春

【摘要】以TA2为焊丝,采用超窄间隙激光焊接方法焊接了10mm的TC4钛合金板,间隙为2mm。利用光学显微镜(OM)、扫描电镜(SEM)和拉伸试验机分析了TC4钛合金接头的组织与性能。结果表明,选取合适的工艺可以实现TC4钛合金超窄间隙激光填丝焊接,获得无缺陷的焊接接头。接头由母材、热影响区、熔合区、焊缝组成,界线清晰。其中热影响区为网篮状组织,焊缝由大β晶粒组成,大晶粒内部为杂乱的α+α′相针状组织,热影响区晶粒明显细化。由于超窄间隙的啮合效应,接头最大抗拉强度为893MPa,达到母材的84.7%,断裂位置在焊缝中心。焊缝区和热影响区的显微硬度高于母材,且在热影响区的显微硬度最大,接头整体显微硬度呈马鞍状分布。

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超窄间隙激光焊接TC4钛合金接头组织及性能研究 崔 冰,张 华,赵常宇,邵童阁 (北京石油化工学院机械工程学院,北京102617) 摘要  以 TA2为焊丝,采用超窄间隙激光焊接方法焊接了10mm 的 TC4钛合金板,间隙为2mm。利用光学显微镜(OM)、 扫描电镜(SEM)和拉伸试验机分析了TC4钛合金接头的组织与性能。结果表明,选取合适的工艺可以实现TC4钛合金超窄间隙激光填丝焊接,获得无缺陷的焊接接头。接头由母材、热影响区、熔合区、焊缝组成,界线清晰。其中热影响区为网篮状组织,焊缝由大β晶粒组成,大晶粒内部为杂乱的α+α′相针状组织,热影响区晶粒明显细化。由于超窄间隙的啮合效应,接头最大抗拉强度为893MPa,达到母材的84.7%,断裂位置在焊缝中心。焊缝区和热影响区的显微硬度高于母材,且在热影响区的显微硬度最大,接头整体显微硬度呈马鞍状分布。 关键词  超窄间隙 激光焊接 TC4钛合金 显微组织 力学性能中图分类号:TG407  文献标识码: A   Microstructure and Mechanical Properties of TC4Titanium Alloy Jointby Ultra-narrow Gap Laser Welding CUI Bing,ZHANG Hua,ZHAO Changyu,SHAO Tongge ( School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617) Abstract  TC4titanium alloy plates of 10mm thick were welded using ultra-narrow gap laser welding method with TA2wire, the gap was 2mm.The microstructure and mechanical properties of joint were tested by  optical microscope,scanning electron micro- scope and tensile testing machine.The result showed that complete defect free butt joints are obtained with ultra-narrow gap laser welding under approp-riate conditions.The welding joint consists of base material,heat affected zone,fusion zone and weld zone,existing clear boundaries.The HAZ is basket weave structure,the WZ consists of largeβgrains and acicularα+α′phase interiors. Due to the meshing effect in the ultra-narrow gap,the maximum tensile strength was up to 893MPa(84.7% of base material)and the fractures occured on WZ.The average hardness of HAZ is much hig

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