Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
The butt dissimilar joints of Al-Mg-Si Alloy A6063 and carbon steel S45C by means of friction stir welding (FSW) were prepared for investigating variation of hardness and amount of deformation during cyclic loading of the joints. And variation of hardness and amount of deformation were also measured on heat treated specimen. Hardness distribution were measured by using Vickers hardness testing machine before applying cyclic load and when the cyclic loading was interrupted at discretional number of cycles, and amount of deformation were measured by measuring the distance between each indentation when the cyclic loading was interrupted. From the experimental results, it was found that the significant deformation and hardness recovering were occurred at early stage of the fatigue life in both case of non-heat treated specimen and heat treated specimen. After the early stage of fatigue life, variation of hardness and amount of deformation were not so significant. The maximum amount of deformation was indicated at where the hardness was minimum, and fatigue fracture occurred at that region, except for the case that the fracture occurred at welding interface.
