科研之友
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摘要
Influence of gas tungsten arc welding on the thermal responses, residual stress distribution and final mechanical properties of the naturally age-hardened (T4) and artificially age-hardened (T6) AA2024 plates was studied. The results showed that age hardening and over-aging occurred in various sections of the heat-affected zone (HAZ) of T4 sample, depending on their locations, while in the HAZ of T6 sample, over-aging is the governing phenomenon. Also, subsequent natural aging occurred in HAZ, weld metal (WM) and partially melted material (PMM) of both weldments. This recent phenomenon is more obvious in the T4 sample in comparison with the T6 one. In both microstructures, weld metal is the weakest part of the weldments and base metal is the strongest section. Furthermore, a double-peak longitudinal residual stress distribution was detected in both temper designations due to the local plastic deformation of the plates. In addition, although the initial microstructure showed a trivial effect on the width of the tensile region, it changed the maximum value of longitudinal residual stress of about 20 MPa. It could be concluded that welding has less negative effects on AA2024-T4 samples in comparison with T6 ones, especially over time, when natural age hardening occurs.
- 出版日期2018-7
