沈长斌
,
王忠志
,
权高峰
,
刘书华
,
葛继平
腐蚀学报（英文）
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
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
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
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
