[1]李玉虎,华鹏,刘澳,等.AZ91D 镁合金搅拌摩擦焊接头组织性能研究[J].焊管,2023,46(8):30-37.[doi:10.19291/j.cnki.1001-3938.2023.08.005]
　LI Yuhu,HUA Peng,LIU Ao,et al.Research on Microstructure and Properties of AZ91D Magnesium Alloy Friction Stir Weld Joint[J].,2023,46(8):30-37.[doi:10.19291/j.cnki.1001-3938.2023.08.005]
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AZ91D 镁合金搅拌摩擦焊接头组织性能研究()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
46
期数:
2023年第8期
页码:
30-37
栏目:
试验与研究
出版日期:
2023-08-19

文章信息/Info

Title:
Research on Microstructure and Properties of AZ91D Magnesium Alloy Friction Stir Weld Joint
文章编号:
10.19291/j.cnki.1001-3938.2023.08.005
作者:
李玉虎; 华鹏; 刘澳; 李先芬
合肥工业大学 材料科学与工程学院，合肥 230009
Author(s):
LI Yuhu;  HUA Peng;  LIU Ao;  LI Xianfen
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
关键词:
搅拌摩擦焊; AZ91D铸造镁合金; 微观组织; 力学性能
Keywords:
friction stir welding;  AZ91D cast magnesium alloy;  microstructure;  mechanical properties
分类号:
TG453.9
DOI:
10.19291/j.cnki.1001-3938.2023.08.005
文献标志码:
A
摘要:
针对AZ91D铸造镁合金开展搅拌摩擦焊试验，研究了工艺参数对搅拌摩擦焊焊接接头性能的影响。结果表明，当转速为300 r/min、行进速度为30~95 mm/min 时，可得到无缺陷焊缝；与母材相比，焊核区由较均匀的等轴晶组成，而母材中的网状β-Al12Mg17 金属间化合物部分转变为细小弥散颗粒和长条状β-Al12Mg17，部分溶入到α-Mg 基体中；焊缝中心从上到下分别为冠状区、中心区、底部区，冠状区的水平方向硬度分布近似水平，中心区及底部区硬度分布则近似“W”型；增大转速时，焊核区的平均硬度逐渐降低，表明焊接热输入的影响大于搅拌头破碎晶粒的影响；接头拉伸试样断裂位置主要为前进侧热影响区，并且抗拉强度明显大于母材，这是因为热影响区中细小弥散的β-Al12Mg17 相能阻碍接头断裂，从而提高接头力学性能。
Abstract:
In terms of the friction stir welding test of AZ91D cast magnesium alloy, the influence of the process parameters on the properties of welded joints was studied. The results show that the defect?ree welds can be obtained when the rotational speed is 300 r/min and the welding speed is 30~95 mm/min. Compared with the base metal, the weld core area is composed of more uniform equiaxed crystals, while the reticulated β?l12Mg17 intermetallic compound in the base material ispartially transformed into the fine diffuse particles and the long strips β ?l12Mg17, partially dissolved into α ?g matrix. Theweld center is divided into crown area, center area and bottom area from the top to the bottom. The hardness distribution inthe horizontal direction of crown area is approximately horizontal, and the hardness distribution in center area and bottomarea is approximately "W" type. The average hardness of the weld core area gradually decreases when the rotational speedincreases which indicates that the effect of welding heat input is greater than the effect of stirring head grain breaking. Thefracture location of the tensile specimen of the joint is mainly in the heat?ffected zone on the advancing side, and thetensile strength is significantly greater than that of the base material. It is because the fine diffuse β ?l12Mg17 phase in theheat?ffected zone can hinder the fracture of the joint, there by improving the mechanical properties of the joint.

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备注/Memo

备注/Memo:
收稿日期：2022-07-18
基金项目：安徽省自然科学基金资助项目“铁素体耐热钢搅拌摩擦焊接接头组织演变和性能特征研究”（项目编号1808085ME150）。
作者简介：李玉虎（1997—），男，合肥工业大学硕士研究生在读，研究方向为搅拌摩擦焊技术。
更新日期/Last Update: 2023-08-24