Fatigue Properties of Butt Welded Aluminum Alloy and Carbon Steel Joints by Friction Stirring
Fatigue Properties of Butt Welded Aluminum Alloy and Carbon Steel Joints by Friction Stirring
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铝合金与碳钢对接焊缝搅拌摩擦疲劳性能
DOI：
10.1088/1742-6596/843/1/012040
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Okane M，Shitaka T，Ishida M，Chaki T，Yasui T，Fukumoto M
中科院分区：
文献类型：
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作者：
Okane M，Shitaka T，Ishida M，Chaki T，Yasui T，Fukumoto M
采用搅拌摩擦焊方法制备了Al-Mg-Si合金JIS A6063与碳钢JIS S45 C的对接接头，研究了接头的疲劳性能。所用的连接工具有硬质合金螺纹探头和由合金工具钢制成的肩部。所有的疲劳试验都是在载荷控制条件下进行的，载荷比R= 0.1，在空气中，在室温下。结果表明，A6063合金在界面附近的硬度低于母材。即使在相同的焊接条件下，也会出现三种类型的疲劳断裂。第一种是在A6063低硬度区与母材的交界处断裂，第二种是在搅拌区由搅拌摩擦焊引起的断裂，第三种是在界面处断裂。第二种情况下的疲劳强度低于其他情况。此外，为了研究热处理对异种接头疲劳性能的影响，还使用在T6处理中相同条件下热处理的试样进行疲劳试验。热处理试样的疲劳断裂起始于A6063与S45 C之间的界面，但与未热处理试样相比，疲劳强度提高了约25%。
The butt dissimilar joints of Al-Mg-Si alloy JIS A6063 and carbon steel JIS S45C by means of friction stir welding were prepared for investigating fatigue properties of the joints. The joining tool used has cemented carbide thread probe and a shoulder made of alloy tool steel. All the fatigue tests were carried out under a load-controlled condition with a load ratio R= 0.1 in air at room temperature. From the experimental results, it was found that hardness near the interface in A6063 was lower than that of base material. Three types of fatigue fracture occurred even in case of same welding condition. The first one was fracture at boundary between the lower hardness region and base material in A6063, the second type was initiated in the stir zone by FSW process and the last one was fracture at interface. Fatigue strength in case of the second one was lower than others. Furthermore, to investigate the effect of heat treatment on fatigue properties of the dissimilar joints, fatigue tests were also carried out with using the specimens which were heat treated under the same condition to aging process in T6 treatment. Fatigue fracture was initiated at interface between A6063 and S45C in case of the heat treated specimen, but fatigue strength was improved approximately 25% as compared with that of the non-heat treated specimen.