STUDY OF MECHANICAL PROPERTIES OF AA7075 ALLOY PRODUCED BY ADDITIVE METHOD
LSESWH
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2024.04.023Keywords:
Aluminum alloy 7075, wire-arc additive manufacturing technology, nanohardness, tensile strength, fa-tigue life.Abstract
Increasing the strength properties of surface layers of light metals and alloys, such as aluminum alloys of the Al-Zn-Mg system, is quite relevant at the present time, this is due to the widespread use of these alloys in the automotive and aerospace industries. With the constant increase in requirements for manufactured parts, a solution may be to master new technologies for producing products, such as additive manufacturing. As is known, the higher the strength and tribological properties of the surface of a part or product, the more effectively it resists external loads during operation. Wire-arc additive manufacturing technology is a highly efficient and inexpensive method for producing large and complex structures and this method can be used to harden the surface of manufactured parts. Further research was carried out using surfacing mode № 2, the fatigue life of which is 7.3% higher than that of samples obtained using surfacing mode № 1. Tensile tests, nanohardness tests and structure studies were carried out in various layers of the resulting workpiece. The tensile strength of the samples in the middle region was 126 MPa, which is 35% more than the samples from the lower region. In areas with a higher cooling rate due to interlayer cooling, the nanohardness value increased to 2.3±0.3 GPa. It is also worth noting that in the middle region of the workpiece under study there are more zones of hardness than in the upper and lower regions, which indicates the formation of solid phases.
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Copyright (c) 2024 Vladislav K. Drobyshev, Irina A. Panchenko, Sergei V. Konovalov, Dmitry N. Labunsky
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