Study On Technique Optimization And Microstructure Property Of 5083H116 Alloy Sheet

The 5083 aluminum alloy belongs to the series of Al-Mg which is a deformation alloy and can not be strengthened by heat treating. It is widely used in shipbuilding industry. In this paper, the behavior of 5083 aluminum alloy during hot compression deformation have been studied by means of the isothermal compression simulation test. The effect of different rolling and stabilizing treatment conditions on the microstructure, mechanical properties, and corrosion properties of the 5083 aluminum alloy sheet is discussed by a series of tests and studies. Such as orthogonal experimental design, testing mechanical properties test, scanning electronic microscope (SEM), energy dispersion spectrum (EDS), metallographic microscopy, intergranular corrosion test and exfoliation corrosion test, polarization curve determination and so on. The optimum 5083 alloying component content is obtained according to the above experimental result.The optimization of production process of the 5083 H116 alloy sheet is improved. The results show that:①The stress raise with the increase of strain rate at the same compression temperature, which show 5083 aluminum alloy is positive strain rate sensitivity material, the stress raise with the reduction of compression temperature at the same strain rate. Deforming degree has little effect on the stress at the same strain rate and the same compression temperature.②The anti-corrosion properties of 5083 alloy have great effect on cold deformation and stabilizing treatment process, the intergranular corrosion and exfoliation corrosion of the 5083 H116 alloy sheets tend to raise with the increase of cold deformation and the reduction of stabilizing treatment temperature. The mechanics of intergranular corrosion and exfoliation corrosion of the alloy were analyzed.③The poor corrosion resistance results from a continuous network ofβ-phase and along the planes of localized deformation in alloy after cold-rolled and stabilizing annealing below130℃. The high corrosion resistance of the cold-rolled alloy stabilizing annealing at 220～250℃is relate to discontinuousβ-phase precipitation uniformly distribute throughout the structure in a globular form. The poor corrosion resistance of cold-rolled alloy stabilizing annealing at higher temperature is attained because of a continuous network ofβ-phase precipitates at boundaries.④Through 5083 alloy component proportion experiment,compare the influence on mechanical properties and anti-corrosive performance of 5083 H116 alloy sheets with different percentage of the element content in order to confirm the best component matching of 5083 alloy. The optimum cold deformation, annealing temperature and time were presented.