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酸性盐雾下2024铝合金搅拌摩擦焊接头的腐蚀行为

付瑞东 , 何淼 , 栾国红 , 董春林 , 康举

中国腐蚀与防护学报

在详细分析2024铝合金搅拌摩擦焊焊缝表面微结构的基础上,采用酸性连续盐雾试验研究焊缝表面的腐蚀行为。组织分析表明,焊缝表层因受搅拌头轴肩水平挤压作用而呈现弧形条纹特征,并导致晶粒和第二相粒子得到显著细化;合金中的第二相粒子主要为棒状的Al2CuMg(S相)和颗粒状的CuAl2θ相)。盐雾试验表明,搅拌摩擦焊焊缝区耐蚀性因包铝层遭到破坏而呈现下降趋势,腐蚀程度因焊缝表面残留的纯铝而呈现不均匀性。腐蚀首先从局部点蚀开始,最终演变为剥落腐蚀。

关键词: 2024铝合金 , friction stir welding , microstructure , salt spray test , corrosion

7A52铝合金的应力腐蚀性能影响

闫永贵马力曾红杰张海兵

腐蚀科学与防护技术

采用慢应变拉伸试验技术研究了阴极极化电位和焊接工艺对7A52铝合金应力腐蚀性能的影响,并利用体视显微镜和扫描电镜分析了断口形貌.结果表明:外加阴极极化使7A52铝合金的应力腐蚀指数增大,应力腐蚀敏感性呈增大趋势;摩擦搅拌焊件应力腐蚀性能优于熔焊件.

关键词: 7A52铝合金应 , stress cracking corrosion , cathodic polarization , metal inert gas welding , friction stir welding

6082铝合金搅拌摩擦焊接头组织及腐蚀性能研究

沈长斌 , 王忠志 , 权高峰 , 刘书华 , 葛继平

腐蚀科学与防护技术

利用光学显微镜及动电位极化曲线技术, 研究了8 mm厚铝合金6082搅拌摩擦焊焊缝的组织形貌及其电化学性能. 结果表明, 主轴转速为1000 r/min, 焊接速度为 160 mm/min, 搅拌头倾角为3°的焊缝组织出现了明显的变化, 焊核区组织发生了动态再 结晶, 形成细小的等轴晶结构, 动电位极化测试表明焊缝的腐蚀电压较两种母材的高, 腐蚀电流较两种母材小.

关键词: 6082铝合金 , friction stir welding , microstructures , electrochemical corrosion

SIMULATION ON TEMPERATURE FIELD OF FRICTION STIR WELDED JOINTS OF 2024-T4 AL

S. X. LÜ , J. C. Yan , W. G. Li , S. Q. Yang

金属学报(英文版)

The thermal model of FSW based on the thermal elastic-plastic finite element method, and the transient temperature distribution of FS welded joints of 2024-T4 Al was simulated by using this model, which provides useful information for the investigation of FSW process. Simulation results show that the temperature distribution of the weld gradually decreases toward periphery in a radiate format, whose center is the probe, and the highest temperature in the weld can reach about 400℃. The initial terminal of the weld is a zone, in which the temperature gradient is great, and defects of the welding are easily produced in this zone. Temperature change at the end of the weld joint is as layer variation, the local serious defects are not easy to produce in this zone.

关键词: friction stir welding , null , null

MICROSTRUCTURAL STUDIES OF FRICTION STIR WELDED AZ31 MAGNESIUM ALLOY

H.Zhang , S.B.Lin , L.Wu , J.C.Feng

金属学报(英文版)

Friction stir welding achieves the well in solid phase by locally introducing frictional heating and plastic flow arising from rotation of the welling tool, which results in changes in the local microstructure of magnesium alloy. The purpose in the paper is to study the microstructures of friction stir welled AZ31 magnesium alloy. Residual microstructures,including dynamic re-crystallization zone and nugget structures have been systematically investigated utilizing optical microscopy (OM), scanning electric microscopy (SEM),transmission electron microscopy (TEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and micro-hardness. AZ31 magnesium alloy has been successfully friction stir welded and exhibits the variations of microstructure including dynamically recrystaUized,equaxied grains in the well nugget. Residual hardness in the nugget was found slightly lower than the parent but not too obvious.

关键词: friction stir welding , null , null

搅拌摩擦焊材料塑性流动可视化研究现状

游国强 , 谭霞 , 赵旭 , 王向杰

兵器材料科学与工程

综述近年来国内外搅拌摩擦焊塑性流动可视化技术的研究现状,分析各种方法的基本原理及优缺点.研究现状表明:异种材料金相组织显示法可以观察到焊缝接头宏观流动,而对搅拌摩擦焊塑性流动的细节无法获取;彩泥法颜色鲜明,易于观察,但其是非晶体材料,故只能在一定程度上模拟搅拌摩擦焊的塑性流动状况;标识材料示踪法是搅拌摩擦焊材料塑性流动可视化工作的主要手段,其选用原则、焊接过程及焊后采用的可视化手段仍需进一步深入探讨;数值模拟是一种高效、低成本的研究方法,其具备再现焊接过程的能力,模拟过程的边界值、搅拌头的描述等方面需要进一步深入探讨.

关键词: 搅拌摩擦焊 , 塑性流动 , 可视化 , 现状

汽车用新型钛合金的搅拌摩擦焊研究

段亚丽

钢铁钒钛 doi:10.7513/j.issn.1004-7638.2014.05.007

进行了6mm厚汽车新型钛合金Ti-6Al-4V-0.2Y板材的单面对接搅拌摩擦焊试验,并对接头的宏观形貌、X光无损探伤、显微组织、表面硬度和力学性能进行测试与分析.结果表明,钛合金Ti-6Al-4V-0.2Y板材的焊接接头成形好、表面光亮、无明显缺陷、力学性能较佳;接头的室温抗拉强度达到900 MPa、接头系数高达96%;接头硬度最大值位于焊核区、最小值位于前进侧热影响区.

关键词: 钛合金 , Ti-6Al-4V-0.2Y合金 , 搅拌摩擦焊 , X光无损探伤 , 力学性能

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